High-temperature crystal structure and transport properties of the layered cuprates Ln(2)CuO(4), Ln=Pr, Nd and Sm

Kaluzhskikh, M.S.; Kazakov, S.M.; Mazo, G.N.; Istomin, S.Y.; Antipov, E.V.; Gippius, A.A.; Fedotov, Y.; Bredikhin, S.I.; Liu, Y.; Svensson, G.; Shen, Z.

Авторы: Kaluzhskikh M.S., Kazakov S.M., Mazo G.N., Istomin S.Ya, Antipov E.V., Gippius A.A., Fedotov Yu, Bredikhin S.I., Liu Yi, Svensson G., Shen Z.
Журнал: Journal of Solid State Chemistry
Том: 184
Номер: 3
Год издания: 2011
Издательство: Elsevier B.V.
Местоположение издательства: Netherlands
Первая страница: 698
Последняя страница: 704
DOI: 10.1016/j.jssc.2011.01.035
Аннотация: High-temperature crystal structure of the layered cuprates Ln(2)CuO(4), Ln = Pr, Nd and Sm with tetragonal T'-structure was refined using X-ray powder diffraction data. Substantial anisotropy of the thermal expansion behavior was observed in their crystal structures with thermal expansion coefficients (TEC) along a- and c-axis changing from TEC(a)/TEC(c)approximate to 1.37 (Pr) to 0.89 (Nd) and 0.72 (Sm). Temperature dependence of the interatomic distances in Ln(2)CuO(4) shows significantly lower expansion rate of the chemical bond between Pr and oxygen atoms (O1) belonging to CuO2-planes (TEC(Pr-O1)= 11.7 ppm K-1) in comparison with other cuprates: TEC (Nd-O1)=15.2 ppm K-1 and TEC (Sm-O1)= 15.1 ppm K-1. High-temperature electrical conductivity of Pr2CuO4 is the highest one in the whole studied temperature range (298-1173 K): 0.1-108 S/cm for Pr2CuO4, 0.07-23 S/cm for Nd2CuO4 and 2 X 10(-4)-9 S/cm for Sm2CuO4. The trace diffusion coefficient (D-T) of oxygen for Pr2CuO4 determined by isotopic exchange depth profile (IEDP) technique using secondary ion mass spectrometry (SIMS) varies in the range 7.2 X 10(-13) Cm-2/S (973 K) and 3.8 X 10(-10) Cm-2/S (1173 K) which are in between those observed for the manganese and cobalt-based perovskites. (C) 2011 Elsevier Inc. All rights reserved.
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High-temperature crystal structure and transport properties of the layered cuprates Ln(2)CuO(4), Ln=Pr, Nd and Smстатья

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