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首页> 外文期刊>Journal of Materials Research >Influence of nanoparticle seeding on the phase formation kinetics of sol-gel-derived Sr_(0.7)Bi_(2.4)Ta_2O_9 thin films
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Influence of nanoparticle seeding on the phase formation kinetics of sol-gel-derived Sr_(0.7)Bi_(2.4)Ta_2O_9 thin films

机译：纳米粒子注入对溶胶-凝胶Sr_（0.7）Bi_（2.4）Ta_2O_9薄膜相形成动力学的影响

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摘要

Sr_(0.7)Bi_(2.4)Ta_2O_9 (SBT) thin films were deposited on unseeded and SBT nanoparticle (approximately 60―80 nm) seeded Pt/Ti/SiO_2/Si substrates via sol-gel and spin-coating techniques. The SBT thin films were heated at 600℃ for 1 h to form the fluorite phase, and these fluorite films were further heated at 730―760℃ for fluorite-to-Aurivillius phase transformation. The volume fractions of Aurivillius phase formation obtained through quantitative x-ray diffraction analyses showed highly enhanced kinetics in seeded SBT thin films. Johnson―Mehl―Avrami isothermal kinetic analyses were performed for the characterization of Aurivillius phase formation in unseeded and seeded SBT thin films using the volume fraction values. The Avrami exponents were determined as approximately 1.4 and approximately 0.9 for unseeded and seeded SBT films, respectively, which reveals different nucleation modes. By using Arrhenius-type plots, the activation energy values for the phase transformation of unseeded and seeded SBT thin films were determined to be approximately 264 and approximately 168 kJ/mol, respectively. This gives a key reason for the enhanced kinetics in seeded films. Microstructural analyses on unseeded SBT thin films showed formation of randomly oriented needlelike crystals, while those on seeded ones showed formation of domains comprising directionally grown wormlike crystals. On the basis of the phase formation kinetics and microstructural development, a model representing different nucleation and crystal growth mechanisms for the unseeded and seeded SBT thin films was proposed.
机译：Sr_（0.7）Bi_（2.4）Ta_2O_9（SBT）薄膜通过溶胶-凝胶和旋涂技术沉积在未播种的SBT纳米颗粒（约60-80 nm）的Pt / Ti / SiO_2 / Si衬底上。将SBT薄膜在600℃下加热1 h形成萤石相，然后将这些萤石膜进一步在730〜760℃下加热以进行萤石到金相的相变。通过定量X射线衍射分析获得的Aurivillius相形成的体积分数显示出种子SBT薄膜的动力学大大增强。使用体积分数值进行了Johnson-Mehl-Avrami等温动力学分析，以表征非种子和种子SBT薄膜中Aurivillius相的形成。对于非种子和种子SBT膜，Avrami指数分别确定为约1.4和0.9，这揭示了不同的成核模式。通过使用Arrhenius型图，未播种和种子SBT薄膜的相变活化能值分别确定为大约264 kJ / mol和大约168 kJ / mol。这给出了种子膜动力学增强的关键原因。对非种子SBT薄膜的微结构分析表明，形成了随机取向的针状晶体，而对晶种的晶体，则显示了由定向生长的蠕虫状晶体构成的畴。基于相形成动力学和微观结构发展，提出了一个模型，该模型代表了非种子和种子SBT薄膜的不同成核和晶体生长机理。

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