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The lead-free piezoelectric ceramics (K0.5Na0.5)NbO3 (abbreviated as KNN) with the relative density of 97.6% were synthesized by press-less sintering owing to the careful control of processing conditions. The phase structure of KNN ceramics was analyzed. The results show that the pure perovskite phase with orthorhombic symmetry is in all ceramics specimens. The effect of poling conditions on the piezoelectric properties of KNN ceramics was investigated. The results show that the piezoelectric constant d33 and electromechanical coupling factor kp increase with poling field, poling temperature and poling time increasing, then decrease because of electric broken. Take into account of poling conditions and piezoelectric properties of pure KNN ceramics, the optimum poling conditions for pure KNN ceramics are poling field of 4 kV/mm, poling temperature of 140 ℃ and poling time of 20-25 min. 相似文献
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系统地研究了溶胶-凝胶(Sol-Gel)方法制备(Pb1-xLax)Ti(1-x/4)O3(简称PLT)薄膜时催化剂(或pH值)、溶液浓度在室温下对形成溶胶和凝胶的影响规律,用X射线结构分析和SEM研究了热处理工艺对薄膜结构及晶粒尺寸的影响。实验表明,浓度、醋酸含量都存在一个最佳的范围,且随镧(La)含量的增加,该范围减小;实验还发现,随着La含量的增加,薄膜的晶化温度降低。在单晶(100)Si衬 相似文献
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介绍了溶胶-凝胶技术制备铁电薄膜的基本原理,工艺过程及工艺特点,综述了溶胶-凝胶法制备铁电薄膜的最新进展。 相似文献
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系统地研究了溶胶-凝胶(Sol-Gel)方法制备(Pb_(1-X)La_x)Ti_(1-x/4)O_3(简称PLT)薄膜时催化剂(或pH值)、溶液浓度在室温下对形成溶胶和凝胶的影响规律,用X射线结构分析和SEM研究了热处理工艺对薄膜结构及晶粒尺寸的影响。实验表明,浓度、醋酸含量都存在一个最佳的范围,且随铜(La)含量的增加,该范围减小;实验还发现,随着La含量的增加,薄膜的晶化温度降低。在单晶(100)Si衬底上成功地制备出了具有钙钛矿型结构、厚度约为200nm、均匀、致密、无裂纹的PLT晶态薄膜。 相似文献
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