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Wyświetlanie 1-15 z 178
Tytuł:
Formation of MnBi by Mechanical Alloying
Autorzy:
Szlaferek, A.
Wrzeciono, A.
Powiązania:
https://bibliotekanauki.pl/articles/1964615.pdf
Data publikacji:
1997-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Ev
75.50.Kj
75.50.Tt
Opis:
In this report we demonstrate that mechanical alloying is an alternative process to produce the intermetallic compound MnBi. Magnetically MnBi powder is prepared from the elemental powders by mechanical alloying in a planetary ball mill and then solid-state reaction at a relatively low temperature. The MnBi powder was aligned in a magnetic field and isostatic pressed. The X-ray pattern of powder reacted clearly shows the intensity peaks of the MnBi phase. After annealing the magnetization was about 1.0×10$\text{}^{-4}$T m$\text{}^{3}$/kg.
Źródło:
Acta Physica Polonica A; 1997, 92, 2; 315-318
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fabrication, Structure and Consolidation of NiAl-Al$\text{}_{2}$O$\text{}_{3}$ Mechanically Alloyed Nanocomposite Powders
Autorzy:
Oleszak, D.
Michalski, A.
Majewski, T.
Powiązania:
https://bibliotekanauki.pl/articles/2035470.pdf
Data publikacji:
2002-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Ev
Opis:
Reactive milling of NiO + Al powder mixture resulted in the formation of NiAl-Al$\text{}_{2}$O$\text{}_{3}$ nanocomposite powders, with a crystallite size of about 20 nm. The Hall-Williamson analysis revealed that NiAl showed an orientation dependent crystallite size after short processing time and orientation dependent internal strain after long milling time. Both anisotropies were removed by heating the powders in the differential scanning calorimetry. Calorimetric studies showed one exothermic effect attributed to the reduction reaction of NiO and endothermic one associated with melting of Al. Two methods were applied for powders compaction: resistance sintering and pulse electric discharge. In both cases the densities of about 90% of the theoretical value were achieved. A significant increase in average NiAl crystallites size in compacted samples was observed, up to several hundreds of nanometers.
Źródło:
Acta Physica Polonica A; 2002, 102, 2; 187-192
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Liberator znad powstańczej Warszawy
Autorzy:
Krajewski, Wojciech.
Powiązania:
Militaria i Fakty 2002, nr 3, s. 41-50
Data publikacji:
2002
Tematy:
Lyne, L. Henry
Royal Air Force. 178 Dywizjon RAF
Obóz jeniecki Oberursel 1944 r. pamiętniki
Obóz jeniecki Barth 1944-1945 r. pamiętniki
Liberator MK.VI EV 961 "C - jak Charlie" (samolot) zestrzelenie Warszawa pamiętniki
Powstanie warszawskie (1944)
Zrzuty lotnicze
Opis:
W artykule zamieszczono relacje uczestników i świadków katastrofy Liberatora.
Fot.
Dostawca treści:
Bibliografia CBW
Artykuł
Tytuł:
Mössbauer, XRD, and SEM Study of FeAl-Based Powder Alloys with Nanoinclusions
Autorzy:
Zaleski, A.
Fedotova, J.
Ilyuschenko, A.
Talako, T.
Belyaev, A.
Letsko, A.
Stanek, J.
Powiązania:
https://bibliotekanauki.pl/articles/2046435.pdf
Data publikacji:
2006-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.66.Dk
81.20.Ev
82.80.Ej
Opis:
Peculiarities of phase composition and morphology in nanostructured (Fe$\text{}_{70}$Al$\text{}_{30}$)$\text{}_{1-x}$(Al$\text{}_{2}$O$\text{}_{3}$)$\text{}_{x}$ (x=64-80 wt.%) powder alloys prepared by self-propagated high temperature synthesis have been studied by $\text{}^{57}$Fe transmission Mössbauer spectroscopy, scanning electron microscopy, and X-ray diffraction. It has been established that phase composition of alloys has not been affected by Al$\text{}_{2}$O$\text{}_{3}$ contribution. Contrary, atomic arrangement in B2 FeAl phase depends on the volume fraction of Al$\text{}_{2}$O$\text{}_{3}$ resulting in the migration of Al atoms from B2 FeAl lattice.
Źródło:
Acta Physica Polonica A; 2006, 109, 3; 441-444
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electromagnetic Properties of Substituted Barium Hexaferrites
Autorzy:
Sláma, J.
Grusková, A.
Jančárik, V.
Štofka, M.
González-Angeles, A.
Powiązania:
https://bibliotekanauki.pl/articles/1813950.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.-y
75.50.Vv
81.20.Ev
81.20.Ka
Opis:
Substituted M-type ferrite $BaFe_{12-2x}(Me_1Me_2)_xO_{19}$, 0≤x≤0.6 was prepared by both mechanical alloying and precursor method, where $Me_1$ = Co, Ni, Zn, Sn and $Me_2$ =Ru, Ti, Zr, Sn. Magnetic phase purity, change of saturation polarization, Curie temperature, coercivity and magnetic susceptibility was studied as function of x. Attention was focused to results obtained for $(NiRu)_x,$ $(ZnRu)_x,$ and $(SnRu)_x$ mixtures with low doping ratio x.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 609-612
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mössbauer Study of Mechanosynthesized and Thermally Treated Co-Fe-Ni Alloys
Autorzy:
Pikula, T.
Oleszak, D.
Pękała, M.
Mazurek, M.
Żurawicz, J.
Jartych, E.
Powiązania:
https://bibliotekanauki.pl/articles/1811586.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Ev
75.50.Kj
76.80.+y
75.60.Ej
Opis:
Mechanical alloying was used to prepare $Co_{40}Fe_{60}$, $Co_{60}Fe_{35}Ni_{5}$, $Co_{40}Fe_{45}Ni_{15}$, and $Co_{40}Fe_{35}Ni_{25}$ alloys from the elemental powders. As X-ray diffraction studies proved the final products of milling were the solid solutions with bcc or fcc lattice and the average grain size between 20 and 50 nm. After heating of the alloys up to 993 K, the mixtures of two solid solutions with bcc and fcc lattices were formed in the case of Co-Fe-Ni alloys. Thermal treatment did not influence the type of the lattice of $Co_{40}Fe_{60}$ alloy. The Mössbauer spectroscopy revealed hyperfine magnetic field distribution ranged from 33 to 38 T for $Co_{40}Fe_{60}$ alloy and from 30 to 37 T for Co-Fe-Ni alloys. In the case of two-phase alloys, distributions were decomposed into two simple Gaussian functions using the numerical fitting. Magnetic measurements allowed to determine the effective magnetic moments and the Curie temperatures of the obtained alloys.
Źródło:
Acta Physica Polonica A; 2008, 114, 6; 1545-1553
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Processing, Microstructure and Dielectric Properties of the $Bi_5Ti_3FeO_{15}$ Ceramic
Autorzy:
Rymarczyk, J.
Dercz, G.
Ilczuk, J.
Powiązania:
https://bibliotekanauki.pl/articles/1811567.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.84.-s
81.20.Ev
81.05.Je
61.05.cp
68.37.Ef
Opis:
The aim of the present work is the analysis of microstructure, dielectric permittivity and thermal properties analysis of $Bi_5Ti_3FeO_{15}$ ceramics obtained by two methods. The studied $Bi_5Ti_3FeO_{15}$ ceramics were prepared by conventional synthesis and hot uniaxial pressing reaction from the conventional mixture of oxides, viz. $TiO_2$, $Fe_2O_3$, $Bi_2O_3$. The studied material has layered perovskite like structures, first described by Aurivillius in 1949 and Subbaro in 1969. The ceramic $Bi_5Ti_3FeO_{15}$ is known to contain a series of compounds with the general formula: $Bi_{m+1}Fe_{m-3}Ti_3O_{3m+3}$. The X-ray diffraction methods were used for qualitative phase analysis of studied samples. The morphology was analyzed by scanning electron microscopy method. The thermal properties of the studied materials were measured using the differential thermal analysis at a constant heating rate of 15 K/min under an argon protective atmosphere. Thermal dependence of dielectric permittivity was studied between room temperature and 1137 K.
Źródło:
Acta Physica Polonica A; 2008, 114, 6A; A-191-A-197
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Soft Magnetic Properties in Bulk Permalloy Alloys Fabricated by a Warm Consolidation
Autorzy:
FŰzer, J.
Kollár, P.
Olekšáková, D.
Roth, S.
Powiązania:
https://bibliotekanauki.pl/articles/1813525.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Bb
81.20.Ev
75.60.Ej
Opis:
Soft magnetic properties of bulk NiFe and NiFeMo alloys consolidated by hot compaction were studied. During annealing the compacts residual stresses diminish by relaxation and soft magnetic properties improve. The lowest coercivity of bulk NiFe and NiFeMo alloys are 11. 0 and 11. 2 A/m, respectively, while the total losses are 1. 81 and 1. 42 W/g at f=10 kHz and $B_\text{max}$ =0. 2 T.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 59-62
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and Magnetic Properties of Hot Pressed NiFe Powder
Autorzy:
Olekšáková, D.
Kollář, P.
Fűzer, J.
Kusý, M.
Powiązania:
https://bibliotekanauki.pl/articles/1813529.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Bb
81.20.Ev
75.60.Ej
Opis:
The aim of this work is to investigate the structure and magnetic properties of compacted microcrystalline NiFe (81 wt. % of Ni) powder. Bulk samples were prepared by compaction of milled NiFe (81 wt. % of Ni) ribbon. We found that after compaction of the powder displacement of domain walls becomes more dominant and the coercivity decreases and is comparable with the coercivity of conventional permalloy. The coercivity of the bulk material before heat treatment is lower than that for powder and that is why we can assume that the magnetic "contact" is restored after compaction. Annealing of bulk samples reduces the losses due to the relaxation of internal stresses induced by milling and compaction.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 75-78
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 178

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