SYNTHESIS OF ALKALI-SUBSTITUTED SR,CU OXYCARBONATES - SUPERCONDUCTIVITY IN SR2-XKXCUO2CO3 (0.25-LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-0.7)статья

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Дата последнего поиска статьи во внешних источниках: 9 ноября 2013 г.

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[1] Synthesis of alkali-substituted sr,cu oxycarbonates - superconductivity in sr2-xkxcuo2co3 (0.25-less-than-or-equal-to-x-less-than-or-equal-to-0.7) / S. KAZAKOV, E. ANTIPOV, C. CHAILLOUT et al. // Physica C: Superconductivity and its Applications. — 1995. — Vol. 253, no. 3-4. — P. 401–406. Sr(2-x)M(x)CuO(2)CO(3), M = Na or K, 0 less than or equal to x less than or equal to 1, samples were obtained by a high-pressure high-temperature technique using SrCO3, SrCuO2 and Na(K)CuO2 as initial reagents. The alkali-doped oxycarbonates were found to exist with Na for 0 less than or equal to x less than or equal to 1, and with K for 0 less than or equal to x less than or equal to 0.7. These oxycarbonates have a tetragonal structure derived from that of Sr2CuO2CO3. The a parameter decreases with increasing alkali ion content from a=3.9062(1) Angstrom (x=0) to a=3.8854(2) Angstrom for x(Na)=1 and to 3.8884(7) Angstrom for x(K)=0.7. Weak superstructure reflections corresponding to doubling of the cell parameters (a=2a, c=2c) were found by electron diffraction for K substituted oxycarbonate, Sr1.6K0.4CuO2CO3. The EDS analysis performed on this sample revealed that the crystallites contained an inhomogeneous K distribution and the average K concentration was found to be smaller than the nominal composition, x=0.16 and x=0.4, respectively. Superconductivity by AC susceptibility measurements was found to exist only for K substituted samples with 0.25 less than or equal to x less than or equal to 0.7, The critical temperature was found to vary in the range of 13-23 K depending on the K content. No superconductivity was observed for Na substituted samples. [ DOI ]

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