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Issue 44, 2016
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Facile growth of centimeter-order, highly crystalline ZnWO4 single crystals by the flux evaporation technique using molten NaCl

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Abstract

Wolframite-type ZnWO4 crystals were grown from molten NaCl using the flux method at temperatures between 700 and 1100 °C. Centimeter-order, idiomorphic single crystals of ZnWO4 were easily obtained from a solute concentration of 40 mol% at 1100 °C, with well-defined facets at {010}, {101}, {−101}, {130}, and {041}. As the heating temperature decreases, the size of the ZnWO4 crystals also decreases. However, millimeter-order ZnWO4 single crystals were still grown from a NaCl flux at 700 °C, whereas solid-state reactions gave only indefinite, micron-order particles even at 1100 °C. It is assumed that NaCl and ZnWO4 form a eutectic composition, resulting in effective crystal growth through a liquid-phase process even below the melting point of NaCl (∼800 °C). In addition, the large-scale evaporation of molten NaCl should facilitate the supersaturation of ZnWO4 crystals, resulting in centimeter-order growth at 1100 °C. The crystallographic characteristics of the flux-grown ZnWO4 crystals were also evaluated; elemental analysis and microscopic observations revealed a highly crystalline nature with respect to chemical stoichiometry, impurities, crystal defects, and regularity of the lattice.

Graphical abstract: Facile growth of centimeter-order, highly crystalline ZnWO4 single crystals by the flux evaporation technique using molten NaCl

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Publication details

The article was received on 28 Jul 2016, accepted on 22 Sep 2016 and first published on 23 Sep 2016


Article type: Paper
DOI: 10.1039/C6CE01659F
Citation: CrystEngComm, 2016,18, 8608-8613
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    Facile growth of centimeter-order, highly crystalline ZnWO4 single crystals by the flux evaporation technique using molten NaCl

    T. Yamada, Y. Sukegawa, H. Wagata, K. Yubuta and K. Teshima, CrystEngComm, 2016, 18, 8608
    DOI: 10.1039/C6CE01659F

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