FORMATION OF INFINITE-LAYERED (CA1-XSRX) CUO2 AND NACUO2-TYPE (CA1-YNAY)(0.85)CUO2 IN TARTRATE ROUTE

Both NaCuO2-type Ca0.85CuO2 and infinite-layered (Ca1-xSrx)CuO2 could be prepared much more easily by firing the dried solids from mixed ace tate aqueous solutions titrated with tartaric acid than by normal calc ination, The presence of a narrow solid-solution composition range of 0.10 < x < 0.16 was confirmed in infinite-layered (Ca1-xSrx)CuO2 in th e preparation using the tartrate route, The calcium could also be subs tituted by sodium in a range of y < 0.15 in NaCuO2-type (Ca1-yNay)(0.8 5)CuO2 using the same route, Further substitution of Ca2+ With Y3+ mig ht also be possible in infinite-layered (Ca1-xSrx)CuO2, but resulted i n the NaCuO2-type compound in the substitution with Na+.