Preparation of Pyrochlore Potassium Tantalate Thin Films on Ta/ITO Glass via Mild Hydrothermal Growth
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概要
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Potassium tantalate with perovskite structure (KTaO<SUB>3</SUB>) is an incipient ferroelectric material that has promising functions in electromechanical and sensing sectors. Potassium tantalate with pyrochlore structure (K<SUB>2</SUB>Ta<SUB>2</SUB>O<SUB>6</SUB>) appears promising in a photocatalystic field. Potassium tantalate powders and bulks were fabricated at high temperature such as over 400°C from Ta<SUB>2</SUB>O<SUB>5</SUB> and KOH. A sheet of tantalum was hard to react with potassium hydroxide in the mild hydrothermal condition at 100–150°C and low alkaline concentrations (0–2 M). Pyrochlore potassium tantalate film was synthesized with a mild hydrothermal method (100–150°C) at short reaction time by using a sputtered tantalum substrate on ITO glass. Synthesis of this film employed significantly low concentrations of KOH solution (0.1–1 M). The potassium tantalate film fabricated by the hydrothermal condition of 0.5 M-KOH solution, 100°C and 3 h reaction time was a smooth surface and became transparent. The particle size of this film was 150 nm.
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The Japan Institute of Metals and Materials | 論文
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