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Tytuł:
Size Effect in Impedance of Nb$\text{}_{3}$Al Superconductor
Autorzy:
Aleksyeyev, P.
Nabiałek, A.
Vasiliev, S.
Rusakov, V.
Chabanenko, V.
Zalutskii, M.
Piechota, S.
Szymczak, H.
Kodess, B. N.
Powiązania:
https://bibliotekanauki.pl/articles/2046746.pdf
Data publikacji:
2006-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.25.Qt
74.70.Ad
Opis:
We present the results of the impedance measurements in Nb$\text{}_{3}$Al superconducting polycrystalline alloy vs. temperature and magnetic field. Using these results and applying the size effect model we calculate the flux-flow conductivity of the Nb$\text{}_{3}$Al superconducting alloy near its critical temperature.
Źródło:
Acta Physica Polonica A; 2006, 109, 4-5; 555-559
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of Zeolite Phase Made from Rice Husk Ash and Sidrap Clay
Autorzy:
Armayani, M.
Mansur, Musdalifa
Asra, Reza
Irwan, Muh
Ramadhanty, Dhian
Subaer, Subaer
Abdullah, Mohd Mustafa Al Bakri
Aziz, Ikmal Hakem A.
Jeż, Bartłomiej
Nabiałek, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/2203746.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
autoclave
clay
rice husk ash
zeolite
Opis:
Zeolite has been successfully synthesized from clay and rice husk ash in the form of powder by using the hydrothermal method with variations in chemical compositions of alkaline solution and the amount of rice husk ash. The clay raw material was obtained from the Sidrap area of South Sulawesi and rice husk ash is obtained from the burning pile of rice husks. Sidrap clay and rice husk ash were activated using an alkaline solution of NaOH and varied rice husk ash and the addition of AlCl3. The addition of AlCl3, an alkaline solution of NaOH and H2O was used in the amount of 25.5 grams and variations of rice husk ash were 2.5 grams and 6.5 grams. Meanwhile, without the addition of AlCl3, an alkaline solution of NaOH and H2O was used for 20.5 grams and variations of rice husk ash from 2.5 grams and 6.5 grams. Then the mixture was then put into an autoclave with a temperature of 100°C for 3 hours. The basic material used in the manufacture of zeolite is carried out by X-ray Fluorescence (XRF) characterization to determine the constituent elements of basic material, which showed the content of SiO2 was 45.80 wt% in the clay and 93.40% in the rice husk ash. The crystalline structure of the zeolite formed was characterized by X-Ray Diffraction (XRD). It was found the resulting zeolite were identified as Zeolite-Y, Hydrosodalite, and ZSM-5. The microstructure properties of the resulting zeolite were determined by using Scanning Electron Microscopy (SEM).
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 1; 269--274
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Naoh Molar Concentration on Microstructure and Compressive Strength of Dolomite/Fly Ash-Based Geopolymers
Autorzy:
Azimi, Emy Aizat
Salleh, Mohd M. A. A.
Abdullah, Mohd Mustafa Al Bakri
Aziz, Ikmal Hakem A.
Hussin, Kamarudin
Chaiprapa, Jitrin
Vizureanu, Petrica
Yoriya, Sorachon
Nabiałek, Marcin
Wyslocki, Jerzy J.
Powiązania:
https://bibliotekanauki.pl/articles/2125545.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
dolomite/fly ash
geopolymer
NaOH concentration
synchrotron
micro-XRF
Opis:
Dolomite can be used as a source of aluminosilicate to produce geopolymers; however, this approach is limited by its low reactivity. This study analyzes the viability of producing geopolymers using dolomite/fly-ash with sodium silicate and NaOH solutions (at multiple concentrations) by determining the resultant geopolymers’ compressive strengths. The dolomite/fly-ash-based geopolymers at a NaOH concentration of ~22 M resulted in an optimum compressive strength of 46.38 MPa after being cured for 28 days, and the SEM and FTIR analyses confirmed the denser surface of the geopolymer matrix. The synchrotron micro-XRF analyses confirmed that the Ca concentration exceeded that of Si and Mg, leading to the formation of calcium silicate hydrate, which strengthens the resulting geopolymers.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 3; 993--998
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and Magnetism of MBE-Grown Co/Cu Multilayers
Autorzy:
Baczewski, L. T.
Wawro, A.
Domagała, J.
Pełka, J.
Szewczyk, A.
Nabiałek, A.
Powiązania:
https://bibliotekanauki.pl/articles/1955475.pdf
Data publikacji:
1997-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Gw
75.30.-m
75.70.-i
Opis:
Structural and magnetic properties of Co/Cu multilayers deposited in the ultra-high vacuum molecular beam epitaxy system on glass substrates with different modulations periods were investigated. A structural characterization was performed by means of RHEED and Auger spectroscopy (in situ), small angle X-ray reflectivity and scanning tunneling microscopy. The samples obtained have a textured, polycrystalline layered structure for deposition at room temperature. Magnetization and in-plane magnetoresistance measurements were performed as a function of Cu and Co layer thicknesses. An influence of different buffers and of interface quality on magnetic properties was investigated.
Źródło:
Acta Physica Polonica A; 1997, 91, 2; 315-319
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low-Temperature Structural Phase Transition in Monoclinic RbDy(WO$\text{}_{4}$)$\text{}_{2}$ Crystal
Autorzy:
Borowiec, M. T.
Dyakonov, V.
Kamenev, V.
Nabiałek, A.
Prokhorov, A.
Szymczak, H.
Załęski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1968975.pdf
Data publikacji:
1998-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.30.-v
75.20.-g
Opis:
The ESR spectrum of Dy$\text{}^{3+}$ ion in the low-symmetry RbDy(WO$\text{}_{4}$)$\text{}_{2}$ crystal has been studied in the temperature region of T=4.2 ÷ 30K. The ESR linewidth was found to increase from 130 mT up to the maximum value of 190 mT at T=9K and then to decrease down to 150 mT at 4.2K. The components of the g-tensor change considerably without change of their spatial orientation in the temperature range from 12K to 7 K: g$\text{}_{z}$=2.5, g$\text{}_{x}$≈0, g$\text{}_{y}$=1.41 at T>12 K; g$\text{}_{z}$=1.53, g$\text{}_{x}$≈0, g$\text{}_{y}$=1.2 at T<7K. The observed λ-shaped behaviour of absorption linewidth and the decrease in the g-factor are assumed to be due to the low-temperature structural phase transition (T$\text{}_{SPT}$≈9 K). The width of the transition area is of about 5K. It is suggested that the symmetry of high- and low-temperature phases is identical.
Źródło:
Acta Physica Polonica A; 1998, 94, 1; 71-77
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania strukturalne i magnetyczne kompozytów wytworzonych na bazie stopu Fe67Co10Ni1W2B20 połączonego żywicą epoksydową
Structural and magnetic studies of composites based on alloy Fe67Co10Ni1W2B20 coupled with epoxy resin
Autorzy:
Bukowska, A.
Szota, M.
Nabiałek, M.
Pietrusiewicz, P.
Błoch, K.
Powiązania:
https://bibliotekanauki.pl/articles/278990.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Inżynierii Materiałów Polimerowych i Barwników
Tematy:
kompozyt magnetyczny
stop
żywica epoksydowa
badania strukturalne
badania magnetyczne
właściwości magnetyczne
magnetic composite
alloy
epoxy resin
structural studies
magnetic studies
magnetic properties
Opis:
W pracy przedstawiono wyniki badań strukturalnych oraz magnetycznych kompozytów otrzymanych na bazie stopu o składzie chemicznym Fe67Co10Ni1W2B20 i żywicy epoksydowej. Badane próbki miały kształt walców oraz posiadały ten sam udział objętościowy żywicy epoksydowej (klej Epidian 100). Wytworzony stop o składzie chemicznym Fe67Co10Ni1W2B20 został niskoenergetycznie rozkruszony w moździerzu, a następnie poddany analizie sitowej i podzielony na trzy frakcje: 20-50 µm, 50-100 µm oraz 100-200 µm. Tak otrzymane proszki stopów zostały połączone z żywicą epoksydową. Określono wpływ wielkości cząstek proszku i osnowy na właściwości magnetyczne kompozytów.
The paper presents the results of the structural and magnetic studies of composites obtained on the Basic of the alloy Fe67Co10Ni1W2B20 and epoxy resin (glue Epidian 100). The resulting alloy with chemical composition Fe67Co10Ni1W2B20 was low-energy crushed in a mortar, and then subjected to a sieve analysis and divided into three fractions: 20-50 microns, 50-100 microns and 100-200 microns. The thus obtained alloy powders were combined with an epoxy resin. Were identified: powder particle size and the magnetic properties of the matrix composites.
Źródło:
Przetwórstwo Tworzyw; 2015, T. 21, Nr 2 (164), 2 (164); 94-97
1429-0472
Pojawia się w:
Przetwórstwo Tworzyw
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of the Magnetization Reversal Process of High-Remanent $Nd_{10}Fe_{83}Zr_1B_6$ Alloy in the As-Cast State
Autorzy:
Ceglarek, A.
Płusa, D.
Dośpiał, M.
Nabiałek, M.
Pietrusiewicz, P.
Powiązania:
https://bibliotekanauki.pl/articles/1429022.pdf
Data publikacji:
2012-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Et
75.50.Vv
75.50.Ww
75.60.Ej
75.60.Jk
Opis:
In this work the magnetic properties of ribbons with composition of $Nd_{10}Fe_{83}Zr_1B_6$ obtained by using the melt-spinning method were studied. From the X-ray diffraction patterns the phase composition was determined. It was found that investigated alloy was composed of α-Fe and $Nd_2Fe_{14}B$ phases. From the peaks broadening the grain sizes of α-Fe and $Nd_2Fe_{14}B$ phases were estimated as equal to 20 nm and 40 nm, respectively. From the recoil curves the reversible $μ_0$ $M_{rev}$ and irreversible $μ_0 M_{irr}$ parts of magnetization and differential susceptibility $χ_{rev}$ and $χ_{irr}$ were determined as a function of an applied field. From these dependences it was found that the pinning of domain walls at the grain boundaries is the main magnetization reversal process. The interactions between grains were investigated by means of the δ M plot. It was stated that short range exchange interaction between grains of hard and soft phases are dominant and causes the remanence enhancement.
Źródło:
Acta Physica Polonica A; 2012, 121, 5-6; 1279-1281
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic properties and surface domain structure of (Nd0.85Dy0.15)10Fe83Zr1B6 thin ribbons
Autorzy:
Ceglarek, A
Plusa, D
Dospial, M
Nabialek, M
Wieczorek, P
Powiązania:
https://bibliotekanauki.pl/articles/173512.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
nanocomposite materials
melt spinning method
Re–Fe–B alloys
hard magnetic magnets
surface domain structure
Opis:
In this paper, the nanocrystalline (Nd0.85Dy0.15)10Fe83Zr1B6 ribbons produced by melt-spinning have been investigated by the X-ray diffraction method (XRD), vibrating sample magnetometer (VSM) and magnetic force microscopy (MFM). The XRD studies showed that material investigated was mainly composed of Re2Fe14B and α-Fe phases with fine grain sizes of 25 and 9 nm, respectively. The magnetic parameters determined from the hysteresis loop measurements are as follows: μ0HC = 0.96 T, μ0MR = 0.76 T, μ0MS = 1.09 T, (BH)max = 88 kJ/m3. The large remanence ratio (μ0MR/μ0MS) of 0.7 results from the exchange coupling between the soft and hard magnetic grains. The large surface interaction domains revealed by MFM confirmed the existence of strong exchange coupling between nanosize grains.
Źródło:
Optica Applicata; 2013, 43, 1; 117-122
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Investigation of the Magnetization Reversal Mechanism in the Nd-Fe-B Type Magnet, Aligned by Hot Deformation
Autorzy:
Dośpiał, M.
Nabiałek, M.
Szota, M.
Lipiec, W.
Nizhankovskii, V.
Ceglarek, A.
Pietrusiewicz, P.
Powiązania:
https://bibliotekanauki.pl/articles/1429024.pdf
Data publikacji:
2012-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Gw
75.30.Kz
75.50.Vv
75.50.Ww
75.60.Jk
Opis:
The magnetization reversal mechanism in the $Nd_{16}Fe_{78}B_6$ hot densified magnet, aligned by means of die-upset forging has been investigated. The magnetic parameters have been derived from major hysteresis loop. The magnetocrystalline anisotropy constants $K_1$ and $K_2$ using Sucksmith-Thompson relation modified by Ram and Gaunt have been calculated from the high field measurements up to 5 T. These data have been used to determine the theoretical value of coercivity as a function of the angle $Ψ_0$ between the sample easy axis and the applied magnetic field direction. The experimental value of coercivity as a function of $Ψ_0$ has been determined from the demagnetization curves measured for different $Ψ_0$ angles. It was found that the best correlation between theoretical and experimental data have been achieved for magnetization reversal mechanism controlled partially by pinning of domain walls on grain boundaries and nucleation processes.
Źródło:
Acta Physica Polonica A; 2012, 121, 5-6; 1282-1284
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the Thermal and Magnetic Properties of Amorphous Fe61Co10Zr2.5Hf2.5Me2W2B20 (Where Me = Mo, Nb, Ni Or Y) Ribbons
Autorzy:
Gruszka, K.
Nabiałek, M.
Szota, M.
Bloch, K.
Gondro, J.
Pietrusiewicz, P.
Sandu, A. V.
Mustafa Al Bakri, A. M.
Walters, K.
Walters, S.
Garus, S.
Dośpiał, M.
Mizera, J.
Powiązania:
https://bibliotekanauki.pl/articles/355886.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
thermal stability
magnetic properties
Opis:
The paper presents the results of structural and magnetic properties and thermal stability for a group of functional materials based on Fe61Co10Zr2.5Hf2.5Me2W2B20 (where Me = Mo, Nb, Ni or Y). Samples were obtained in the form of ribbons using melt-spinning method. The X-ray diffraction patterns of investigated samples confirmed their amorphous structure. Based on the analysis of DSC curves characteristic temperatures: glass forming temperature (Tg), crystallization temperature (Tx) and temperature range of the supercooled liquid ΔTx were determined. Small addition of transition metals elements has strong influence on magnetic and thermal parameters of studied materials. The comprehensive studies revealed that in terms of magnetic properties the Ni-addition resulted in highest reduction in coercivity and anisotropy field.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2A; 641-644
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of SnO2/TiO2 with the Addition of Polyethylene Glycol via Sol-Gel Method for Self-Cleaning Application
Autorzy:
Halin, Dewi Suriyani Che
Azliza, Azani
Razak, Kamrosni Abdul
Abdullah, Mohd Mustafa Al Bakri
Salleh, Mohd Arif Anuar Mohd
Wahab, Juyana A
Chobpattana, Varistha
Kaczmarek, Łukasz
Nabiałek, Marcin
Jeż, Bartłomiej
Powiązania:
https://bibliotekanauki.pl/articles/2203743.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
TiO2
SnO2
thin film
polyethylene glycol
self-cleaning
Opis:
TiO2 is one of the most widely used metal oxide semiconductors in the field of photocatalysis for the self-cleaning purpose to withdraw pollutants. Polyethylene glycol (PEG) is recommended as a stabilizer and booster during preparation of water-soluble TiO2. Preparation of SnO2/TiO2 thin film deposition on the surface of ceramic tile was carried out by the sol-gel spin coating method by adding different amount of PEG (0g, 0.2g, 0.4g, 0.6g, 0.8g) during the preparation of the sol precursor. The effects of PEG content and the annealing temperature on the phase composition, crystallite size and the hydrophilic properties of SnO2/TiO2 films were studied. The X-ray diffraction (XRD) spectra revealed different phases existed when the films were annealed at different annealing temperatures of 350°C, 550°C and 750°C with 0.4 g of PEG addition. The crystallite sizes of the films were measured using Scherrer equation. It shows crystallite size was dependent on crystal structure existed in the films. The films with mixed phases of brookite and rutile shows the smallest crystallite size. In order to measure the hydrophilicity properties of films, the water contact angles for each film with different content of PEG were measured. It can be observed that the water contact angle decreased with the increasing of the content of PEG. It shows the superhydrophilicity properties for the films with the 0.8 g of PEG annealed at 750°C. This demonstrates that the annealed temperature and the addition of PEG affect the phase composition and the hydrophilicity properties of the films.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 1; 243--248
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of injection method to modify titanium alloy Ti6Al4V
Autorzy:
Klimas, J.
Łukaszewicz, A.
Szota, M.
Nabiałek, M.
Powiązania:
https://bibliotekanauki.pl/articles/285312.pdf
Data publikacji:
2014
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
biomaterials
titanium alloy Ti-6Al-4V
massive amorphous alloy
Opis:
In the present work, the samples were subjected to a comparative analysis of the titanium alloy Ti6Al4V prepared by various methods. The research included a comparison of the following properties of manufactured elements: microstructure, phase composition and surface roughness. The test results clearly showed that these properties are different when using different method of casting. These changes allows the use of prepared elements in medicine.
Źródło:
Engineering of Biomaterials; 2014, 17, no. 128-129; 91-92
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modification of the Structure and Properties of the Titanium Alloy Ti6Al4V in Biomedical Applications
Modyfikacja struktury i właściwości stopu tytanu Ti6Al4V w aspekcie zastosowań biomedycznych
Autorzy:
Klimas, J.
Łukaszewicz, A.
Szota, M.
Nabiałek, M.
Powiązania:
https://bibliotekanauki.pl/articles/353198.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
titanium alloy Ti-6Al-4V
production of nanocrystalline alloys by injection method
biomaterials
stopy tytanu Ti6Al4V
wytwarzanie stopów nanokrystalicznych metodą wtrysku
biomateriał
Opis:
From the time when Per-Ingvar Brånemark discovered oseointegration properties of titanium in 1952 a large-scale studies on the issue of usability this metal in surgery were started. Thanks to the parallel research conducted on independent centers managed to get a number of metal alloys which were implanted into the human body in the form of implants. Among the alloys produced appeared alloy of aluminum and vanadium Ti6Al4V. The mechanical properties, high biocompatibility, low density and for this relatively low-cost, caused that the alloy began to be used as a material for biomedical applications. In the present article analyzed the possibility of modifying the properties of the alloy, by choosing another method of producing – method of injection casting with suction. A comparative analysis of the input material - the alloy commercially produced in the form of a rod of the same material melted by injection under vacuum and in air were carried out. The studies results indicate that using method of injection casting with suction to produce the final item influence on significant improvement in mechanical properties as a result of fragmentation of the grains at the element surface. The mechanical properties play a key role in a tissue-implant-bone system.
Od 1952roku, kiedy to Per-Ingvar Brånemark odkrył osteointegracyjne właściwości tytanu, rozpoczęto w znacznym stopniu badania w kwestii przydatności tego metalu w chirurgii. Poprzez badania prowadzone przez kilka niezależnych ośrodków naukowo - badawczych w organizm człowiek wszczepiono szereg stopów metali w postaci implantów. Wśród wszczepianych stopów pojawił się Ti6Al4V, którego charakteryzują bardzo dobre właściwości mechaniczne, wysoka zgodność biologiczna, niska gęstość przy stosunkowo niskiej cenie. Spowodowało to, że stop ten zaczął być używany jako materiał do zastosowań biomedycznych. W niniejszym artykule przeanalizowano możliwość modyfikowania właściwości stopu, poprzez zmianę metody wytwarzania, wtłaczania w atmosferze próżni lub w powietrzu. Przeprowadzono analizę porównawczą materiału wyjściowego - stopu, jaki wytwarza się komercyjnie w przemyśle w postaci prętów, a materiału uzyskanego metodą wtłaczania z zastosowaniem próżni oraz w powietrzu. Wyniki badań wykazują, że zastosowanie metody wtłaczania wpływa na znaczącą poprawę właściwości mechanicznych w wyniku rozdrobnienia ziaren na powierzchni elementu. Właściwości mechaniczne odgrywają istotną rolę w połączeniach: tkanka - implant - kość.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 3A; 2013-2018
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Critical State Stability and Flux Jumps Dynamics in a Single Crystal of $YBa_{2}Cu_{3}O_{7-δ }$
Autorzy:
Nabiałek, A.
Vasiliev, S.
Chabanenko, V.
Yao, X.
Cai, Y.
Guo, L.
Kuzovui, M.
Powiązania:
https://bibliotekanauki.pl/articles/1431339.pdf
Data publikacji:
2012-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.72.-h
74.25.Sv
Opis:
We studied the critical state stability and the dynamics of the flux jumps, caused by thermomagnetic avalanches, in a large (3× 3× 1 $mm^{3}$) single crystal of $YBa_{2}Cu_{3}O_{7-δ }$ superconductor. Flux jumps were observed only at the lowest temperatures attainable in our system (at about 2.2 K) and for the external magnetic field parallel to the c-axis of the investigated crystal. It is shown that thermomagnetic avalanches are initiated in dynamic conditions, for which the magnetic diffusivity is much smaller than the thermal diffusivity. For large single crystals of $YBa_{2}Cu_{3}O_{7-δ }$ immersed directly in liquid helium, the analysis of the critical state stability can be performed in isothermal approximation. However, the conditions of the critical state stability can change dramatically by improving the thermal isolation between the sample and the surrounding coolant. The dynamics of the flux jumps was analyzed in the framework of the model of magnetic diffusion. It is shown that the magnetic diffusivity changes dramatically during the process of the thermomagnetic avalanche. We also studied the influence of the external magnetic field and of the magnetic history on the duration of the flux jumps.
Źródło:
Acta Physica Polonica A; 2012, 121, 4; 836-840
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamics of Thermomagnetic Avalanches in Melt-Textured YBaCuO Superconductors
Autorzy:
Nabiałek, A.
Vasiliev, S.
Aleksyeyev, P.
Chabanenko, V.
Powiązania:
https://bibliotekanauki.pl/articles/2047241.pdf
Data publikacji:
2007-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.72.Bk
74.25.Qt
Opis:
We investigated dynamics of the thermomagnetic avalanche development in melt-textured samples of the oxide YBaCuO high temperature superconductor. We found that the flux jumps, caused by the thermomagnetic instabilities, are accompanied by giant convergent oscillations of the surface induction. These results are compared with the dynamics of the flux jumps in other type-II superconductors, including conventional NbTi and oxide high temperature Bi $\text{}_{2}$Sr$\text{}_{2}$CaCu$\text{}_{2}$O$\text{}_{8+δ}$ superconductor, and discussed in the framework of the available model of the thermomagnetic avalanche development.
Źródło:
Acta Physica Polonica A; 2007, 111, 1; 153-158
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
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