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    Wyświetlanie 1-3 z 3
    Tytuł:
    Magnetic and Transport Properties of RNiSb Compounds (R = Gd, Tb, Dy, Yb, Lu)
    Autorzy:
    Skolozdra, R. V.
    Guzik, A.
    Goryn, A. M.
    Pierre, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1964639.pdf
    Data publikacji:
    1997-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Mb
    72.15.Eb
    72.20.Pa
    Opis:
    The structural, magnetic, electrical and thermoelectric properties of heavy rare-earths ternary compounds RNiSb were investigated. Except Yb-based compound (and nonmagnetic Lu), all compounds are low temperature antiferromagnets. YbNi$\text{}_{0.9}$Sb reflects some mixed valence behaviour. Magnitude of the resistivity indicates that investigated compounds are semimetals or high doped semiconductors.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 2; 343-346
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnon Drag Effect on Resistivity and Thermoelectric Power of Semimetallic Antiferromagnet USb
    Autorzy:
    Henkie, Z.
    Wiśniewski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1943936.pdf
    Data publikacji:
    1995-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.15.Eb
    72.20.Pa
    75.50.Ee
    72.15.Jf
    Opis:
    Resistivity ρ(T) and absolute thermoelectric power S(Τ) have been measured for USb single crystals characterized by different residual resistivity ratios, RRR = ρ(300 K)/ρ(4.2 K). A 50 μV/K peak of S(Τ) observed at 40 K for high RRR crystal vanishes for low RRR one. The ρ ∝ Τ$\text{}^{4}$ dependence observed below 40 K changes to the ρ ∝ Τ $\text{}^{5}\text{}^{/}\text{}^{2}$ one. These variations are ascribed to reduction of the magnon drag effect by an increased incoherent magnetic scattering of carriers, possibly induced by a small change of composition. Resistivity anomaly is analysed above the antiferromagnetic transition temperature T$\text{}_{N}$. We have found that resistivity decreases as tlnt in the range 0.02 ≤ t ≤ 0.35, where t = (Τ - T$\text{}_{N}$)/T$\text{}_{N}$. It is ascribed to a semimetallic character of this compound.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 6; 1103-1112
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nanostructure features, phase relationships and thermoelectric properties of melt-spun and spark-plasma-sintered skutterudites
    Autorzy:
    Kogut, Iu.
    Nichkalo, S.
    Ohorodniichuk, V.
    Dauscher, A.
    Candolfi, C.
    Masschelein, P.
    Jacquot, A.
    Lenoir, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1052685.pdf
    Data publikacji:
    2018-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.15.Eb
    72.15.Jf
    72.20.Pa
    66.70.Df
    81.20.Ev
    81.16.-c
    81.40.Gh
    Opis:
    Reduction of thermal conductivity remains a main approach relevant to enhancement of figure-of-merit of most thermoelectric materials. Melt spinning combined with spark plasma sintering appears to be a vital route towards fine-grain skutterudites with improved thermoelectric performance. However, upon high-temperature processing the Fe_{4-x}Co_{x}Sb_{12}-based skutterudites are prone to decompose into multiple phases, which deteriorate their thermoelectric performance. In this study we addressed the effects of combined melt spinning and spark plasma sintering on the phase composition and microstructural properties of filled Fe_{4-x}Co_{x}Sb_{12} as well as their influence on thermoelectric characteristics of these compounds. The crystallites of filled Fe_{4-x}Co_{x}Sb_{12} were effectively reduced to sizes below 100 nm upon melt spinning, but also severe decomposition with weakly preserved nominal phase was observed. Spark plasma sintering of melt spun skutterudites resulted in even further reduction of crystallites. Upon short annealing and sintering the n-type materials easily restored into single-phase filled CoSb₃ with nanoscale features preserved, while secondary phases of FeSb₂ and Sb remained in p-type compounds. Relatively high figure-of-merit ZT_{max} of 0.9 at T ≈ 400°C has been gained in nanostructured Yb_{x}Co₄Sb_{12}, however, no significant reduction of thermal conductivity was observed. Abundant impurities in p-type filled Fe_{4-x}Co_{x}Sb_{12} led to drastic drop in their ZT, which even further degraded upon thermal cycling.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 4; 879-883
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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