THERMAL-DECOMPOSITION BEHAVIOR OF HETERONUCLEAR COMPLEXES, LN[CO(CN)(6)]CENTER-DOT-NH(2)O (LN=LA-YB)

The thermal decomposition behavior of Ln-Co(1:1) cyano complexes and the composition of decomposition products have been examined, Decomposition of their CN-bridged structures proceeded on heating at about 300 degrees C in air, generating amorphous phases containing carbonate complexes. For the complexes comprising La-Nd, submicron sized particles of perovskite-type oxide were formed (without single phase oxides Co3O4 and Ln(2)O(3)) from an amorphous phase by heating at about 620 degrees C. For the complexes comprising Eu, Gd and Dy, a mixture of single oxides (Co3O4 and Ln(2)O(3)) and perovskite-type oxide was formed, The content of the perovskite type oxide increased with the increase in decomposition temperature. For the complexes containing Ho and Yb the corresponding perovskite-type oxide could not be obtained even when the complex was decomposed at 1100 degrees C.