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Preparation of Potassium Tantalate Niobate by Sol–Gel Method
Authors:Shin-ichi Hirano  Toshinobu Yogo  Ko-ichi Kikuta  Toshiyuki Morishita  Yasuhiro Ito
Affiliation:Department of Applied Chemistry, School of Engineering, Nagoya University, Nagoya 464, Japan
Abstract:Perovskite potassium tantalate niobate (KTN) powders and thin films were synthesized from a metal alkoxide solution. Homogeneous KTN coating solutions were prepared from KOC2H5, Ta(OC2H5)5, and Nb(OC2H5)5 in absolute ethanol. The precursor crystallized to pyrochlore at ∼ 650°C, and then to perovskite at ∼ 750°C, depending upon Ta:Nb ratio. H2O vapor during calcination was found to play a prominent role in the direct and predominant crystallization of perovskite films with preferred orientation. Highly oriented KTN films of perovskite structure were successfully prepared on MgO (100) substrates at 675°C.
Keywords:potassium    tantalates    niobates    thin films    sol–gel
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