Formation of Infinite-Layered (Ca1-xSrx) CuO2 and NaCuO2-type (Ca1-yNay)0.85CuO2 in Tartrate Route |
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Authors: | Shinichi Kikkawa Namie Kato Noriko Taya Masakazu Tada Fumikazu Kanamaru |
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Affiliation: | The Institute of Scientific and Industrial Research, Osaka University, Osaka 567, Japan |
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Abstract: | Both NaCuO2-type Ca0.85CuO2 and infinite-layered (Ca1- x Sr x )CuO2 could be prepared much more easily by firing the dried solids from mixed acetate aqueous solutions titrated with tartaric acid than by normal calcination. The presence of a narrow solid-solution composition range of 0.10 < x > 0.16 was confirmed in infinite-layered (Ca1- x Sr x )CuO2 in the preparation using the tartrate route. The calcium could also be substituted by sodium in a range of y > 0.15 in NaCuO2-type (Ca1- y Na y )0.85CuO2 using the same route. Further substitution of Ca2+ with Y3+ might also be possible in infinite-layered (Ca1- x Sr x )CuO2, but resulted in the NaCuO2-type compound in the substitution with Na+. |
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