Single Crystal Growth of Scheelite

Low-temperature flux growth of sulfates, molybdates, and tungstates of Ca, Sr, and Ba and investigation of doping with Mn 6+

“…An extrapolation of the liquidus (solubility) curve resulted in the eutectic coordinate of 0.8 mol% BaMoO 4 .…”

“…AXO 4 single crystals are promising host materials for the incorporation of optically active hexavalent ions in tetrahedral oxo-coordination. A large variety of methods have been used to grow AXO 4 single crystals, with A = Ca, Sr, Ba and X = Mo, W, including the hydrothermal, Verneuil, laser-heated pedestal, Bridgman-Stockbarger, and Czochralski techniques [1][2][3][4][5].…”

“…A large variety of methods have been used to grow AXO 4 single crystals, with A = Ca, Sr, Ba and X = Mo, W, including the hydrothermal, Verneuil, laser-heated pedestal, Bridgman-Stockbarger, and Czochralski techniques [1][2][3][4][5]. In contrast, growth from the melt fails in the case of another crystal with tetrahedral oxo-coordination, BaSO 4 , owing to a phase transition at 1090…”

“…First, the flux growth is slow and the growing crystal is not exposed to a high temperature gradient, which could be detrimental to producing crack-free crystals. Second, a low growth temperature is essential if, for example, the compound exhibits a phase transition below its melting point, as is the case for BaSO 4 . On the other hand, problems related to choosing a suitable solvent, optimizing the solute concentration, and minimizing the imperfections of flux-grown crystals must be solved when employing the growth from solutions.…”

“…BaSO 4 :Mn 6+ has so far shown the highest luminescence quantum efficiency at room temperature [20]. Tungstates and molybdates of Ca, Sr, and Ba could be interesting host materials for real-world applications, because they possess higher thermal conductivity and mechanical stability than BaSO 4 …”