Materials Research Bulletin, Vol.32, No.3, 327-335, 1997
A Neutron-Diffraction Study of Stoichiometric and Reduced Lacr0.6Ni0.4O3
The structures of LaCr0.6Ni0.4O3 and LaCr0.6Ni0.4O2.8 have been determined by Rietveld refinement of neutron powder diffraction data. LaCr0.6Ni0.4O3 adopts the orthorhombic GdFeO3 structure with space group Pnma, a = 5.4735(1) Angstrom, b = 7.7568(2) Angstrom, c = 5.5105(1) Angstrom, V = 233.96 Angstrom(3), Z = 4. LaCr0.6Ni0.4O2.8 is rhombohedral, with space group R(3) over barc$, and a = 5.5264(3) Angstrom, c = 13.2991(4) Angstrom, V = 351.754 Angstrom(3), Z = 6.
Keywords:TEMPERATURE-PROGRAMMED TECHNIQUES;NI)O3 PEROVSKITE SYSTEM;BOND-VALENCE PARAMETERS;METHANE;DEACTIVATION;TRANSITION;SCIENCE;POWDERS;LA(CR