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Wyszukujesz frazę "Sn2O" wg kryterium: Wszystkie pola

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    Wyświetlanie 1-8 z 8
    Tytuł:
    Structural, Thermal, Magnetic, and Transport Properties of (La$\text{}_{2}\text{}_{/}\text{}_{3}$ Ca$\text{}_{1}\text{}_{/}\text{}_{3}$ )(Mn$\text{}_{1-x}$Sn$\text{}_{x}$)O$\text{}_{3-δ}$ Compounds
    Autorzy:
    Przewoźnik, J.
    Chmist, J.
    Kolwicz-Chodak, L.
    Tarnawski, Z.
    Kołodziejczyk, A.
    Krop, K.
    Kellner, K.
    Gritzner, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2038395.pdf
    Data publikacji:
    2004-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.47.Lx
    75.47.Gk
    75.40.Cx
    Opis:
    The structural, magnetic, and electrical transport properties of Sn-doped manganite La$\text{}_{0.67}$Ca$\text{}_{0.33}$Mn$\text{}_{1-x}$ Sn$\text{}_{x}$O$\text{}_{3-δ}$ (x=0, 0.01, 0.03, andδ≈0.06) compounds were studied using X-ray powder diffraction, scanning electron microscopy, AC susceptometer and vibrating sample magnetometer measurements as well as four-probe resistance measurements. The specific heat was measured by the heat-pulse method. The Curie temperature T$\text{}_{C}$ and the metal-insulator transition temperature T$\text{}_{M-I}$ decreased nonlinearly with increasing Sn content. The T$\text{}_{C}$ and T$\text{}_{M-I}$ values, for the x=0, 0.01, and 0.03 compounds were separated by 18.2 K, 66.3 K, and 10 K, respectively. The resistivity above T$\text{}_{C}$ for all of these compounds followed the Mott variable-range-hopping model. This allowed the estimation of the localization lengths of 2.2Å (x = 0), 1.33Å (x=0.01) and 1.26Å (x=0.03). The x=0 and x=0.01 compounds exhibited anomalies of R(T) at corresponding T$\text{}_{C}$ and allowed the separation of the magnitude of the purely magnetic contribution to the resistance which for x=0 was≈5 .7Ω and for x=0.01,≈22 .4Ω. The specific heat of the Sn-free sample exhibited a sharp peak at T$\text{}_{C}$. With increasing Sn content the peak at T$\text{}_{C}$ broadened and the area under the peak decreased. For x= 0.03 the peak was hardly detectable. Our results on La$\text{}_{0.67}$Ca$\text{}_{0.33}$ Mn$\text{}_{1-x}$Sn$\text{}_{x}$O$\text{}_{3}$ reveal that a small substitution of Sn$\text{}^{4+}$ for Mn$\text{}^{4+}$ suppresses double exchange interactions and strongly affects the magnetic, thermal, and transport properties of the parent compound.
    Źródło:
    Acta Physica Polonica A; 2004, 106, 5; 665-680
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of supports on coke deposition on supported platinum and platinum-tin catalysts investigated by FT-IR spectroscopy
    Autorzy:
    Sarbak, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/778486.pdf
    Data publikacji:
    2007
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    FTIR
    katalizator Pt-Sn
    Al2O3
    SiO2
    SiO2-Al2O3
    coke deposit
    Pt-Sn catalysts
    Opis:
    Coke deposit is produced from ethylene on the surface of the platinum and platinum-tin catalysts supported on two various AI2O3, SiO2 and SiO2-Al2O3. The coke amount and the structure depend on the type and the amount of the components introduced onto the catalyst support and on the type of the support. It has been found that the surface area of the support has no significant effect on the type of species in the coke deposit. The analysis of the FT-IR spectra has shown the presence of different species on the surface of the catalysts, including carboxyl groups, pseudo-graphite (polyaromatic) structures, polyphenylene groups, acetyl groups, carbonyl groups of acetone and formate type, enol species.
    Źródło:
    Polish Journal of Chemical Technology; 2007, 9, 1; 23-26
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Participation of analogues of lysophosphatidic acid (LPA): oleoyl-sn-glycero-3-phosphate (L-α-LPA) and 1-oleoyl-2-O-methyl-rac-glycerophosphothionate (OMPT) in uterine smooth muscle contractility of the pregnant pigs
    Autorzy:
    Markiewicz, W.
    Kaminska, K.
    Bogacki, M.
    Maslanka, T.
    Jaroszewski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/30322.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    Recent studies show that a representative of phospholipids, namely lysophosphatidic acid (LPA) and its receptors (LPA1-3) play a significant role in the reproductive processes, i. a, in the modulation of the uterine contractility. The participation of LPA3 in the reproductive processes has been revealed in mice and has not been studied in gilts. Therefore, in the present study we investigated the role/action of LPA and its receptors LPA1, LPA2 and LPA3 on the contraction activity in the porcine uterus. The study was conducted on an experimental model in which the pig uterus consisted of the one whole uterine horn and a part of the second horn, both connected with the uterine corpus. Uterine strips consisting of the endometrium with the myometrium (ENDO/MYO) and myometrium (MYO) alone were collected on days 12-14 of the estrous cycle (control group; n = 5) or pregnancy (experimental group; n = 5). Two analogues of LPA at increasing doses were used: oleoyl-sn-glycero- 3-phosphate (L-α-LPA, a selective agonist of LPA1 and LPA2 receptors; 10-7 M; 10-6 M and 10-5 M) and 1-oleoyl-2-O-methyl-rac-glycerophosphothionate (OMPT, a selective agonist of LPA3 receptor; 68 nM; 136 nM and 680 nM). L-α-LPA caused an increase in the contraction tension, amplitude and frequency of ENDO/MYO from the uterine horn with the developing embryos. This effect was not observed in MYO in both groups examined. In the ENDO/MYO strips of the uterine horn with developing embryos, OMPT significantly increased the contraction tension at the highest dose (680 nM) and amplitude at all doses examined, while frequency of contractions was decreased at doses of 136 nM and 680 nM. In the MYO strips of the uterine horn with embryos a significant increase in the contraction tension and amplitude after the highest dose of OMPT was observed. The results obtained imply the important role of receptors LPA1 , LPA2 and LPA3 in the contraction activity of the porcine uterus during early pregnancy.
    Źródło:
    Polish Journal of Veterinary Sciences; 2012, 15, 4
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermodynamic Properties of Geometrically Frustrated S=1/2 XY Antiferromagnet $Er_{2}Sn_{2}O_{7}$
    Autorzy:
    Al Ghamdi, N.
    Orendáčová, A.
    Pavlík, V.
    Orendáč, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1368676.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.10.Dg
    75.50.Ee
    75.30.Sg
    Opis:
    The magnetic susceptibility, specific heat and entropy of geometrically frustrated S=1/2 XY antiferromagnet $Er_{2}Sn_{2}O_{7}$ are reported. It is shown, that temperature dependence of magnetic susceptibility above nominally 10 K is governed by crystal field effects. Systematic study of specific heat in magnetic fields up to 7 T enabled the estimation of exchange coupling, J/k<<4.6 K. Investigation of isothermal change of magnetic entropy upon magnetization from 1 T to 7 T revealed the absence of enhanced magnetocaloric effect. The obtained results suggest that frustration parameter f ≈140 proposed for $Er_{2}Sn_{2}O_{7}$ earlier may be significantly overestimated.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 264-265
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of preparation method on the performance of PtSn/Al2O3 &enspcatalysts for acetic acid hydrogenation
    Autorzy:
    Zhang, K.
    Zhang, H.
    Ma, H.
    Ying, W.
    Fang, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/779525.pdf
    Data publikacji:
    2015
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    Pt-Sn catalysts
    preparation method
    acetic acid hydrogenation
    XPS
    CO-FTIR
    Opis:
    PtSn/Al2O3 &enspcatalysts with a given loading of 1 wt% Pt and 1 wt% Sn were prepared by co-impregnation or successive impregnation with aqueous solutions of Pt, Sn precursors and a commercial alumina. The catalysts were characterized by N2 &enspadsorption, H2-TPR (H2&ensp temperature-programmed reduction), H2-pulse chemisorption, XPS (X-ray photoelectron spectroscopy) and CO-FTIR (Fourier transform infrared spectroscopy), and tested in the hydrogenation of acetic acid. The results showed that the preparation method affected both the chemical properties and their performance in the hydrogenation of acetic acid. Sn enrichment on the catalysts surface was observed on the co-impregnated catalyst and catalyst in which the Pt precursor had been loaded first. It was found that the modification of Pt was a function of the sequence of Sn addition as revealed by CO-FTIR. Co-impregnated catalyst showed the highest activity and ethanol selectivity.
    Źródło:
    Polish Journal of Chemical Technology; 2015, 17, 1; 11-17
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Superconducting and Magnetic Properties of $Sn-Doped EuBa_2Cu_3O_{7-δ}$ Compound
    Autorzy:
    Dvurečenskij, A.
    Cigáň, A.
    van Driessche, I.
    Škrátek, M.
    Majerová, M.
    Bruneel, E.
    Maňka, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398306.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.72.-h
    74.25.Ha
    Opis:
    Influence of Sn-substitution on structural, superconducting and magnetic properties of $EuBa_2Cu_3O_{7-δ}$ (Eu-123) compound was studied by X-ray diffraction and SQUID magnetic measurements. Transition process from normal to superconducting state and temperature dependences of zero field cooling and field cooling characteristics of magnetic moment and magnetization curves were measured and analysed. Samples of the nominal composition of $EuBa_2Cu_{3-x}Sn_xO_{7-δ}$ with x ranging from 0.0 to 1.5 were prepared by the solid state reaction technique. The increasing Sn-content decreases the volume of the main superconducting phase (Eu-123) and for higher Sn-contents, semiconducting tetragonal Eu₃Ba₃Cu₆O₁₄(Eu-336) and Ba-Sn-O phases are the dominant ones.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 1045-1047
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimised magnetron sputtering method for the deposition of indium tin oxide layers
    Autorzy:
    Musztyfaga-Staszuk, Małgorzata
    Pudiš, Dušan
    Socha, Robert
    Gawlińska-Nęcek, Katarzyna
    Panek, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/2090684.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    In2O3
    Sn2O
    ITO
    magnetron sputtering method
    metoda rozpylania magnetronowego
    Opis:
    The article presents the method of magnetron sputtering for the deposition of conductive emitter coatings in semiconductor structures. The layers were applied to a silicon substrate. For optical investigations, borosilicate glasses were used. The obtained layers were subjected to both optical and electrical characterisation, as well as structural investigations. The layers on silicon substrates were tested with the four-point probe to find the dependence of resistivity on the layer thickness. The analysis of the elemental composition of the layer was conducted using a scanning electron microscope equipped with an EDS system. The morphology of the layers was examined with the atomic force microscope (AFM) of the scanning electron microscope (SEM) and the structures with the use of X-ray diffraction (XRD). The thickness of the manufactured layers was estimated by ellipsometry. The composition was controlled by selecting the target and the conditions of the application, i.e. the composition of the plasma atmosphere and the power of the magnetrons. Based on the obtained results, this article aims to investigate the influence of the manufacturing method and the selected process parameter on the optical properties of thin films, which should be characterised by the highest possible value of the transmission coefficient (>85–90%) and high electrical conductivity.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 6; e139005, 1--6
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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