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Jonane I. X-ray absorption near edge spectroscopy of thermochromic phase transition in CuMoO4 [Електронний ресурс] / I. Jonane, A. Cintins, A. Kalinko, R. Chernikov, A. Kuzmin // Физика низких температур. - 2018. - Т. 44, № 5. - С. 568-572. - Режим доступу: http://nbuv.gov.ua/UJRN/PhNT_2018_44_5_10 Thermochromic phase transition was studied in CuMoO4 using the Cu and Mo K-edge x-ray absorption spectroscopy in the temperature range of 10 - 300 K. The hysteretic behavior has been evidenced from the temperature dependence of the pre-edge shoulder intensity at the Mo K-edge, indicating that the transition from brownish-red <$Egamma>-CuMoO4 to green <$Ealpha>-CuMoO4 occurs in the temperature range of 230 - 280 K upon heating, whereas the <$Ealpha>-to-<$Egamma> transition occurs between 200 and 120 K upon cooling. Such behavior of the pre-edge shoulder at the Mo K-edge correlates with the change of molybdenum coordination between distorted tetrahedral in <$Ealpha>-CuMoO4 and distorted octahedral in <$Egamma>-CuMoO4. This result has been supported by ab initio full-multiple-scattering x-ray absorption near edge structure (XANES) calculations.
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