%0 Journal Article
%A Pudza, Inga
%A Kalinko, Aleksandr
%A Cintins, Arturs
%A Kuzmin, Aleksejs
%T 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
%J Acta materialia
%V 205
%@ 1359-6454
%C Amsterdam [u.a.]
%I Elsevier Science
%M PUBDB-2020-05306
%P 116581 (1-32)
%D 2021
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000609936600044
%R 10.1016/j.actamat.2020.116581
%U https://bib-pubdb1.desy.de/record/453510