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Investigation on preparation and structure of YSr 2‐x Ca x V 3 O 9‐y
Author(s) -
Jian Meng,
YuFang Ren,
Ping He
Publication year - 1990
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.19900080402
Subject(s) - chemistry , orthorhombic crystal system , vanadium , electrical resistivity and conductivity , lattice constant , analytical chemistry (journal) , rare earth , powder diffraction , crystallography , oxygen , diffraction , inorganic chemistry , crystal structure , mineralogy , organic chemistry , physics , optics , electrical engineering , engineering
New rare earth vanadates YSr 2‐x Ca x Ca x V 3 O 9‐y (x—0.0, 0.67, 1.0, 1.33 and 2.0) have been synthesized by a new simple method. X‐ray powder diffraction results show that they are mono‐phase. They belong to orthorhombic structure and their lattice constants are calculated. The results of weight gains in TG curves show that the lower valent vanadium is oxidized to higher valent state at higher temperature. The oxygen contents of new compounds are calculated from the weight gains. Both V 3+ and V 4+ coexist in YS r 2‐ x Ca x V 3 O 9‐y. These compounds exhibit low electric resistivity at room temperature.