Mixed valency in the high-temperature phases of transition metal molybdates,AMoO4 (A=Fe, Co, Ni) | Zendy

R A Mohan Ram | Zendy; J. Gopalakrishnan | Zendy

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Mixed valency in the high-temperature phases of transition metal molybdates,AMoO4 (A=Fe, Co, Ni)

Author(s) -

R A Mohan Ram,

J. Gopalakrishnan

Publication year - 1986

Publication title -

journal of chemical sciences

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.32

H-Index - 52

eISSN - 0973-7103

pISSN - 0253-4134

DOI - 10.1007/bf02895723

Subject(s) - valency , x ray photoelectron spectroscopy , cobalt , valence (chemistry) , transition metal , phase transition , materials science , spectroscopy , metal , mössbauer spectroscopy , analytical chemistry (journal) , chemistry , inorganic chemistry , crystallography , condensed matter physics , nuclear magnetic resonance , metallurgy , physics , philosophy , linguistics , biochemistry , organic chemistry , quantum mechanics , chromatography , catalysis

Transition metal molybdates of the formulaAMoO4 whereA=Fe, Co or Ni exhibit a first-order phase transition between 670K–970K. An investigation of the lowtemperature (lt) and high-temperature (ht) phases by x-ray photoelectron spectroscopy, x-ray absorption spectroscopy, magnetic susceptibility and other physical methods shows that the phase transition is associated with a valence change of the typeA 2++Mo6+αA 3++Mo5+ in the cases of iron and cobalt molybdates.

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