TY  - JOUR
AU  - Pudza, Inga
AU  - Kalinko, Aleksandr
AU  - Cintins, Arturs
AU  - Kuzmin, Aleksejs
TI  - Study of the thermochromic phase transition in CuMo<sub>1−x</sub>W<sub>x</sub>O<sub>4</sub> solid solutions at the W L<sub>3</sub>-edge by resonant X-ray emission spectroscopy
JO  - Acta materialia
VL  - 205
SN  - 1359-6454
CY  - Amsterdam [u.a.]
PB  - Elsevier Science
M1  - PUBDB-2020-05306
SP  - 116581 (1-32)
PY  - 2021
AB  - Polycrystalline CuMo<sub>1−x</sub>W<sub>x</sub>O<sub>4</sub> solid solutions were studied by resonant X-ray emission spectroscopy (RXES) at the W L<sub>3</sub>-edge to follow a variation of the tungsten local atomic and electronic structures across thermochromic phase transition as a function of sample composition and temperature. The experimental results were interpreted using ab initio calculations. The crystal-field splitting parameter Delta for the 5d(W)-states was obtained from the analysis of the RXES plane and was used to evaluate the coordination of tungsten atoms. Temperature-dependent RXES measurements were successfully employed to determine the hysteretic behaviour of the structural phase transition between the alpha and gamma phases in CuMo<sub>1−x</sub>W<sub>x</sub>O<sub>4</sub> solid solutions on cooling and heating, even at low (x<0.10) tungsten content. It was found that tungsten ions have octahedral coordination for in the whole studied temperature range (90-420 K), whereas their coordination changes from tetrahedral to octahedral upon cooling for smaller (x<=0.15) tungsten content. Nevertheless, some amount of tungsten ions was found to co-exists in the octahedral environment at room temperature for x<0.15. The obtained results correlate well with the color change in these solid solutions.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000609936600044
DO  - DOI:10.1016/j.actamat.2020.116581
UR  - https://bib-pubdb1.desy.de/record/453510
ER  -