...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Sol-Gel Science and Technology >Size Effect on Crystal Structures of Barium Titanate Nanoparticles Prepared by a Sol-Gel Method
【24h】

Size Effect on Crystal Structures of Barium Titanate Nanoparticles Prepared by a Sol-Gel Method

机译：溶胶-凝胶法制备钛酸钡纳米粒子晶体结构的尺寸效应

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Barium titanate nanoparticles were synthesized by the hydrolysis of complex alkoxide precursor that was prepared in a reflux of metallic barium and tetraethylorthotitanate in solvent. The hydrolysis was performed by the addition of water/ethanol solution to the precursor solution. As reflux time increased, particle sizes, which were measured with transmittance electromicroscopy, became smaller followed by sharpening of size distribution. As water concentration and benzene content in the hydrolysis increased, the particle size increased with crystallite size that was determined with X-ray diffractometry. No significant difference was observed between the particle and crystallite sizes up to 30 nm. Over the size of 30 nm, the particle size was larger than the crystallite size because of generation of polycrystallites. Annealing treatments in air at 400 and 1000degC also increased both the particle and crystallite sizes. The crystallite sizes estimated from the (111) peaks were smaller than those from (110) peaks in a range of sizes larger than 40 nm, which indicated that the critical crystallite size of transformation from cubic to tetragonal structures was approximately 40 nm.
机译：钛酸钡纳米粒子是通过在金属钡和四乙氧基钛酸乙酯在溶剂中回流制备的复杂醇盐前体的水解合成的。通过将水/乙醇溶液添加到前体溶液中来进行水解。随着回流时间的增加，用透射电镜测量的粒度变小，随后粒度分布变陡。随着水解中水浓度和苯含量的增加，粒度随通过X射线衍射法测定的微晶尺寸而增加。在至多30 nm的颗粒和微晶尺寸之间未观察到显着差异。在30nm的尺寸上，由于产生多晶，所以粒径大于微晶尺寸。在400和1000℃的空气中进行退火处理也增加了颗粒和微晶的尺寸。在大于40nm的尺寸范围内，从（111）峰估算的微晶尺寸小于从（110）峰估算的微晶尺寸，这表明从立方到四方结构转变的临界微晶尺寸约为40 nm。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号