• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Materials Research >Crystallization kinetics of homogeneously precipitated lead titanate using urea: Comparison with the conventional ammonia precipitated sample
【24h】

Crystallization kinetics of homogeneously precipitated lead titanate using urea: Comparison with the conventional ammonia precipitated sample

机译：使用尿素均匀沉淀钛酸铅的结晶动力学：与常规氨沉淀样品的比较

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

Ultrafine, PbZr_(0.53)Ti_(0.47)O_3 powder was synthesized by homogeneous precipitation of metal ions in aqueous solution using urea. The results obtained from different characterization methods were compared with those obtained from the conventional precipitation method using ammonia in terms of crystallization, homogeneity, and microstructure. The as-dried precipitate converted to the single-phase crystalline lead zirconate titanate powder when calcined at 550 deg C and above. The calcined powder showed smaller particle size, minimum agglomeration, and uniform shape. The growth of the particles was very little at higher temperatures. Powdered samples that precipitated using urea crystallized directly to rhombohedral lead zirconate titanate, without any intermediate pyrochlore phase formation. The NH_3-precipitated powder converted to rhombohedral lead zirconate titanate via metastable pyrochlore and it showed phase segregation upon annealing at higher temperatures. The reaction kinetics has been studied by x-ray diffraction, differential thermal analysis, and differential scanning calorimetry.
机译：通过使用尿素在水溶液中均匀沉淀金属离子，合成了超细PbZr_（0.53）Ti_（0.47）O_3粉末。比较了从不同的表征方法获得的结果与从传统的使用氨沉淀法获得的结果的结晶度，均质性和微观结构。当在550℃及以上煅烧时，干燥的沉淀物转化为单相结晶锆钛酸铅钛酸盐粉末。煅烧的粉末显示出较小的粒度，最小的团聚和均匀的形状。在较高温度下，颗粒的生长非常小。使用尿素沉淀的粉末状样品直接结晶成菱面体锆钛酸铅钛酸盐，而没有任何中间的烧绿石相形成。 NH_3沉淀的粉末通过亚稳态的烧绿石转化为菱面体的锆钛酸铅钛酸酯，并且在较高温度下退火时显示出相偏析。已经通过X射线衍射，差热分析和差示扫描量热法研究了反应动力学。

著录项

  • 来源
    《Journal of Materials Research》 |2006年第4期|p.856-863|共8页
  • 作者

    S. Roy; S. Bysakh; J. Subrahmanyam;

  • 作者单位

    Defence Metallurgical Research Laboratory, DRDO, Hyderabad-500058, A.P., India;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
  • 关键词

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