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Probing the Thermochromic Phase Transition in CuMoO 4 by EXAFS Spectroscopy
Author(s) -
Jonane Inga,
Cintins Arturs,
Kalinko Aleksandr,
Chernikov Roman,
Kuzmin Alexei
Publication year - 2018
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201800074
Subject(s) - extended x ray absorption fine structure , molybdenum , spectroscopy , x ray absorption spectroscopy , phase transition , absorption spectroscopy , molybdate , crystallography , phase (matter) , coordination number , copper , materials science , atom (system on chip) , octahedron , thermochromism , chemistry , condensed matter physics , inorganic chemistry , ion , crystal structure , optics , physics , organic chemistry , quantum mechanics , computer science , metallurgy , embedded system
Extended X‐ray absorption fine structure (EXAFS) spectroscopy at the Mo K‐edge is used to follow the thermochromic γ ‐to‐ α phase transition in copper molybdate (CuMoO 4 ). The temperature dependence (10–300 K) of the radial distribution function (RDF) for the Mo–O atom pairs in the first coordination shell of molybdenum atoms is reconstructed by the regularization‐like method from the experimental EXAFS spectra. The analysis of the RDFs suggests that the transition occurs gradually within the two‐phase coexistence range of 225–275 K. The local environment of molybdenum atoms transforms upon the γ ‐to‐ α phase transition from strongly distorted octahedral to less distorted tetrahedral coordination.