Fabrication of La2Ti2O7 crystals using an alkali-metal molybdate flux growth method and their nitridability to form LaTiO2N crystals under a high-temperature NH3 atmosphere

Inorganic Chemistry
Mirabbos HojamberdievKatsuya Teshima

Abstract

Flux growth is a promising method that allows one to control over the crystalline phase, crystal shape, crystal size, and crystal surface through the selection of a suitable flux. In this work, lanthanum titanate (La2Ti2O7) crystals with different morphologies were grown using the Na2MoO4, K2MoO4, NaCl, and mixed NaCl + K2MoO4 (molar ratio = 3:7) fluxes, and their nitridability to form LaTiO2N crystals under a high-temperature NH3 atmosphere was also investigated. The effects of the solute concentration and cooling rate on the growth of the La2Ti2O7 crystals were also studied. The X-ray diffraction results revealed that the {100} plane was dominant in the La2Ti2O7 platelet crystals grown using the alkali-metal molybdate fluxes. When the solute concentration was increased from 1 to 20 mol %, the average size of the crystals decreased without considerable alteration of the overall crystal morphology. The La2Ti2O7 crystals with the preferred ⟨010⟩ and ⟨001⟩ growth directions along the b and c axes were grown using the Na2MoO4 and K2MoO4 fluxes, respectively. Compared to the Na2MoO4 flux, the K2MoO4 flux did not show a cooling-rate-dependent effect on the growth of the La2Ti2O7 crystals. It was found that conversion of the La2Ti2O7...Continue Reading

References

Feb 14, 2006·The Journal of Physical Chemistry. B·Ryu AbeHideki Sugihara
May 23, 2006·Inorganic Chemistry·René B MacquartHans-Conrad Zur Loye
May 21, 2010·Chemical Communications : Chem Comm·Masatomo YashimaKazunari Domen
Dec 3, 2011·Chemical Communications : Chem Comm·Céline M LeroyMichaël Grätzel
Jan 31, 2012·Angewandte Chemie·Daniel E Bugaris, Hans-Conrad zur Loye
Jan 28, 2014·Nano Letters·Michinori MatsukawaKazunari Domen

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Citations

Apr 1, 2019·Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials·Nobuo IshizawaJun Wang
May 19, 2017·Dalton Transactions : an International Journal of Inorganic Chemistry·Jinwen ShiShaohua Shen
Nov 28, 2019·Inorganic Chemistry·Akira HosonoShinichi Kikkawa

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