Crucibleless crystal growth and Radioluminescence study of calcium tungstate single crystal fiber

• CaWO4 single crystal fibers were grown by using the LHPG technique.
• We have used a modification in the way of heating of the seed and feed rods.
• The fibers exhibit comparable luminescence features reported for bulk single crystal.
• LHPG technique can be applied to grow other materials having similarities with CaWO4.

In this article, single phase and high optical quality scheelite calcium tungstate single crystal fibers were grown by using the crucibleless laser heated pedestal growth technique. The as-synthesized calcium tungstate powders used for shaping seed and feed rods were investigated by X-ray diffraction technique. As-grown crystals were studied by Raman spectroscopy and Radioluminescence measurements. The results indicate that in both two cases, calcined powder and single crystal fiber, only the expected scheelite CaWO4 phase was observed. It was verified large homogeneity in the crystal composition, without the presence of secondary phases. The Radioluminescence spectra of the as-grown single crystal fibers are in agreement with that present in Literature for bulk single crystals, presented a single emission band centered at 420 nm when irradiated with β-rays.