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Growth of {100}-Faceted NaFeTiO4 Crystals with Tunable Aspect Ratio from a NaCl–Na2SO4 Binary Flux

Abstract

The controlled growth of needle-shaped and planar bar-shaped NaFeTiO4 crystals, a CaFe2O4-type structure, was carried out by a flux method using a NaCl–Na2SO4 binary flux. NaCl flux have been empirically investigated for growing unique anisotropic crystals shapes. However, strategies for controlling the crystal morphology based on NaCl flux have not been established. In this study, Na2SO4 was added to a NaCl flux for supplying O2− ions which is essential for dissolving ability of metal oxide to be ions, and the growth manner was systematically investigated as a function of the flux composition. As a result, needle-shaped crystals were obtained from the pure NaCl flux with exposed {100} facets. Meanwhile, with the binary flux, the morphology of the crystals changed from needle shape to planar bar-shape depending on the Na2SO4 content, where the aspect ratio of the {100} facets were increased by about ten times. It is found out that the aspect ratio of {100} planes of NaFeTiO4 crystals can be controlled kinetically by the cooperative effect of Na+ ions and anionic species in flux; Na+ ions stabilize the {100} facets and high O2−/Cl ratio increase the concentration of ions as a precursor for crystal growth to promote the growth in <001> directions, resulting in planar bar-shaped crystals. We believe that the morphological control resume, demonstrated here in the growth of NaFeTiO4 crystals in NaCl–Na2SO4 binary flux, could be useful idea in a high temperature chemistry and their desirable applications.

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Publication details

The article was received on 29 Oct 2017, accepted on 30 Nov 2017 and first published on 01 Dec 2017


Article type: Paper
DOI: 10.1039/C7CE01876B
Citation: CrystEngComm, 2017, Accepted Manuscript
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    Growth of {100}-Faceted NaFeTiO4 Crystals with Tunable Aspect Ratio from a NaCl–Na2SO4 Binary Flux

    T. Sudare, D. Kawaura, K. Yubuta, F. Hayashi and K. Teshima, CrystEngComm, 2017, Accepted Manuscript , DOI: 10.1039/C7CE01876B

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