Abstract
A high-precision X-ray diffraction study of crystals with the nominal compositions (Na0.5Y0.495Er0.005)WO4 and (Na0.5Gd0.25La0.25)MoO4 and the subsequent refinement and analysis of their compositions showed that an increased number of vacancies at the tungsten sites contributes to the cracking of crystals. It was also found that an associate—a color center (a vacancy at the molybdenum site and an electron localized near the vacancy)—gives the crystals a yellow color. The formation of regularly oriented isostructural domains with coherent boundaries as a bulk defect was observed for the first time for crystals of the scheelite family.
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