6533b857fe1ef96bd12b46f9
RESEARCH PRODUCT
X-ray absorption near edge spectroscopy of thermochromic phase transition in CuMoO4
Aleksandr KalinkoRoman ChernikovInga JonaneArturs CintinsAlexei Kuzminsubject
Phase transitionMaterials sciencePhysics and Astronomy (miscellaneous)Absorption spectroscopyAb initioAnalytical chemistryGeneral Physics and Astronomychemistry.chemical_element02 engineering and technology010402 general chemistry01 natural sciences:NATURAL SCIENCES:Physics [Research Subject Categories]ddc:530Absorption (electromagnetic radiation)SpectroscopyCuMoO4X-ray absorption spectroscopyAtmospheric temperature range021001 nanoscience & nanotechnologyXANES3. Good health0104 chemical scienceschemistryMolybdenumphase transitionthermochromism0210 nano-technologydescription
Thermochromic phase transition was studied in CuMoO4 using the Cu and Mo K-edge x-ray absorption spec-troscopy in the temperature range of 10-300 K. The hysteretic behavior has been evidenced from the tempera-ture dependence of the pre-edge shoulder intensity at the Mo K-edge, indicating that the transition from brown-ish-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 ab-sorption near edge structure (XANES) calculations.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2018-05-01 |