X-ray absorption near edge spectroscopy of thermochromic phase transition in CuMoO₄

• Published in: Физика низких температур
• Date: 2018
• Main Authors: Jonane, I., Cintins, A., Kalinko, A., Chernikov, R., Kuzmin, A.
• Format: Article
• Language: English
• Published: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2018
• Subjects: Динамика кристаллической решетки
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/176119
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: X-ray absorption near edge spectroscopy of thermochromic phase transition in CuMoO₄ / I. Jonane, A. Cintins, A. Kalinko, R. Chernikov, A. Kuzmin // Физика низких температур. — 2018. — Т. 44, № 5. — С. 568-572. — Бібліогр.: 39 назв. — англ.

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 γ-CuMoO₄ to green α-CuMoO₄ occurs in the temperature range of 230–280 K upon heating, whereas the α-to-γ 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 α-CuMoO₄ and distorted octahedral in γ-CuMoO₄. This result has been supported by ab initio full-multiple-scattering x-ray absorption near edge structure (XANES) calculations.