Transparent thin films of Bi₂WO₆, Bi₄Ti₃O₁₂ and Sr_0.75Ba_0.25Nb₂O₆

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• 作者：P. Wollmann ; B. Schumm ; S. Kaskel
• 关键词：Thin films ; Bismuth molybdate ; Bismuth tungstate ; Bismuth titanate ; Strontium barium niobate
• 刊名：Solid State Sciences
• 出版年：2012
• 出版时间：September, 2012
• 年：2012
• 卷：14
• 期：9
• 页码：1378-1384
• 全文大小：1118 K

文摘

Transparent thin films were prepared by a sol-gel method starting from precursor formation in solution, subsequent spin coating followed by a heating ramp up to a maximum of 700?¡ãC. Starting from a Bi₂MoO₆ synthesis route, the phase formation and thin film processing of the bismuth containing materials Bi₂WO₆, Bi₃Ti₄O₁₂ and additionally of the tungsten-bronze structure Sr_0.75Ba_0.25Nb₂O₆ were studied. Spin coating was used to adjust the film thickness in a wide range from 6 to 200?nm. All films were obtained as multicrystalline pure phases according to X-ray diffraction analyses. Scanning electron micrographs revealed homogeneous coatings composed of nanoparticles with a crystallite size varying between 20 and 100?nm, furthermore the UV-VIS spectra demonstrated a high transparency of the films, 80-90 % at 600?nm.