Ketova D. A.1, Krzhizhanovskaya M. G.2, Selyutin A. A.2, Zhuk N. A. 1
1Syktyvkar State University, Syktyvkar, Russia
2St. Petersburg State University, St. Petersburg, Russia
Email: deika.160904@gmail.com
The crystal structure and optical properties of solid solutions Bi2Mg1-xCrxTa2O9+Δ (x≤0.7) with a disordered pyrochlore structure (space group Fd3m: setting 2). With increasing magnesium content, the lattice parameter increases from 10.45852(1) Angstrem (x(Mg)=0.3) to 10.49991(1) (x(Mg)=0.7). Chromium-rich samples exhibit green coloration with reflection in the green 552-558 nm and red #710 nm regions. The width of the band gap for direct allowed electronic transitions varies in the range 2.14-2.29 eV depending on the chromium(III) ion content. Chromium doping reduces the photoactivity of bismuth-containing pyrochlore. Keywords: chromium, magnesium, pyrochlore, structure, optical properties.
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