Application of Flux Method to the Fabrication of Ba5Ta4O15, Sr5Ta4O15, Sr2Ta2O7, and BaTaO2N Polycrystalline Films on Ta Substrates

Teshima Katsuya; Hara Yuki; Yubuta KunioOishi ShujiDomen KazunariHojarriberdiev Mirabbos

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Application of Flux Method to the Fabrication of Ba5Ta4O15, Sr5Ta4O15, Sr2Ta2O7, and BaTaO2N Polycrystalline Films on Ta Substrates

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The fabrication of high-quality trystal layers has been an active research topic in the field of modem materials chemistry with potential applications in various industrial fields. In particular, photocatalytic water splitting, in which hydrogen and oxygen molecules are directly dissociated from water using solar energy and visible-light-driven photocatalysts, is a potentially economical and green process forTroducing clean arid renewable hydrogen energy. In this work, films of three crystalline oxides,Ba5Ta4O15, Sr5Ta4O15, Sr2Ta2O7, and one crystalline oxynitride, BaTaO2N, were grown using the flux coating technique in molten chloride salts (flux) at 1000 degrees C. The film growth was studied under several different conditions. In particular, we investigated the effect of three different atmospheres "(air, nitrogen, and ammonia) on the growth behavior and composition of the polycrystalline layers grown from a BaCl2-2H(2)O flux. We found that the growth atmospheres were important in forming idiomorphic crystals with well-developed facets and characteristic shapes. In particular, idiomorphic Ba(5)Ta(4)O1(5) crystals shaped like elongated hexagons were grown vertically and densely packed on the TaOx/Ta metal surface. Ba5Ta4O5 is thought to be formed by a reaction between the Ba source and TaOx in the flux. Furthermore, under an NH3 gas atmosphere, densely packed BaTaO2N crystals were directly grown On the Ta metal surface: We achieved the growth of relatively thick crystal layers using our flux-coating method.

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《Crystal growth & design》 |2017年第4期|1583-1588|共6页
作者
Teshima Katsuya; Hara Yuki; Yubuta KunioOishi ShujiDomen KazunariHojarriberdiev Mirabbos;
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Shinshu Univ, Fac Engn, Dept Environm Sci & Technol, 4-17-1 Wakasato, Nagano 3808553, Japan;

Tohoku Univ, Inst Mat Res, Aoba Ku, 2-1-1 Katahira, Sendai, Miyagi 9808577, Japan;

Univ Tokyo, Sch Engn, Dept Chem Syst Engn, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1138656, Japan;

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中图分类晶体学;
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Application of Flux Method to the Fabrication of Ba5Ta4O15, Sr5Ta4O15, Sr2Ta2O7, and BaTaO2N Polycrystalline Films on Ta Substrates

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