SYNTHESIS AND STRUCTURAL CHARACTERIZATION OF A NEW PEROVSKITE SERIES DERIVED FROM LANIO3 LA(5)NI(4)MO(15) (M=MO, TE, W)

The synthesis and crystal structure of the orthorhombic La(5)Ni(4)MO(1 5) (M = Mo, Te, W) compounds are reported. These compounds can be rega rded as being derived from LaNiO3 by substitution of 20% of Ni3+ by M( 6+) With the consequent reduction of some Ni3+ to Ni2+ Neutron, X-ray and electron diffraction data have established that these compounds ar e isostructural and have a distorted perovskite structure in which the cations placed in B sites are randomly distributed.