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Studies on Some Ternary Oxides of AVO 3 Composition
Author(s) -
Palanisamy T.,
Gopalakrishnan J.,
Sastri M. V. C.
Publication year - 1975
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.19754150312
Subject(s) - vanadium , ternary operation , metal , oxidation state , inorganic chemistry , materials science , lanthanide , hexagonal crystal system , ion , alkaline earth metal , formula unit , hydrogen , analytical chemistry (journal) , chemistry , crystallography , crystal structure , metallurgy , organic chemistry , computer science , programming language , chromatography
AVO 3 (A = Ba 2+ , Sr 2+ , La 3+ , Gd 3+ ) oxides have been prepared by hydrogen reduction of suitable vanadium(V) ternary oxides. The oxidation state of vanadium in the reduction products seems to be controlled by the nature of other cations. In the presence of strongly basic alkaline‐earth metal ions, Ba 2+ and Sr 2+ as in Ba 2 V 2 O 7 and Sr 2 V 2 O 7 , vanadium is reduced to +4 state. But when A is a trivalent lanthanide ion as in LnVO 4 (Ln = La or Gd), the reduction of vanadium proceeds to +3 state to yield LnVO 3 phases. The products have been characterized by X‐ray diffraction. BaVO 3 crystallizes in a hexagonal structure related to Ba 3 V 2 O 8 while SrVO 3 , LaVO 3 and GdVO 3 crystallize in GdFeO 3 type structure. Electrical transport measurements indicate that BaVO 3 , LaVO 3 and GdVO 3 are p‐type semiconductors while SrVO 3 is metallic.