搜索

x

留言板

尊敬的读者、作者、审稿人, 关于本刊的投稿、审稿、编辑和出版的任何问题, 您可以本页添加留言。我们将尽快给您答复。谢谢您的支持!

姓名
邮箱
手机号码
标题
留言内容
验证码

双掺杂BaxAgyCa3-x-yCo4O9氧化物的织构与电输运性能

张飞鹏 路清梅 张久兴 张忻

引用本文:
Citation:

双掺杂BaxAgyCa3-x-yCo4O9氧化物的织构与电输运性能

张飞鹏, 路清梅, 张久兴, 张忻

Texture and electrical transport properties of Ba and Ag double substituted BaxAgyCa3-x-yCo4O9 oxide

Zhang Fei-Peng, Lu Qing-Mei, Zhang Jiu-Xing, Zhang Xin
PDF
导出引用
  • 采用柠檬酸溶胶凝胶和放电等离子烧结制备了Ca位双掺杂型的BaxAgyCa3-x-yCo4O9烧结体,利用X射线衍射仪、扫描电子显微镜、电阻率测试仪等研究了烧结体相组成、取向度、织构及电性能.结果表明:含Ag的掺杂试样中出现了偏离化学计量比分布的Ag单质,掺杂试样取向度随Ba与Ag掺杂量之比x/y的增大而提高,含Ag的掺杂试样取向度低于未掺杂试样,不含Ag的掺杂试样取向度高于未掺杂试样.x=y=01的试样导电机理发生变化.Ba,Ag掺杂量相等的试样保持较低取向度的同时具有较低的电阻率,在973 K时达到最低值(73 mΩcm),而取向度最低的Ag单掺杂试样电阻率在所有试样中最低,在973 K时为63 mΩcm.
    Doublesubstituted BaxAgyCa3-x-yCo4O9 bulks were fabricated by nitric acid solgel and spark plasma sintering, and the phase composition, orientation, texture and electrical transport properties of the bulks were investigated by means of X-ray diffraction,scanning electron microscope and electrical resisitivity measurement. The result shows that silver which does not belong to the stoichiometric compounds BaxAgyCa28Co4O9 is distributed in the matrix. The degree of orientation increases with increasing ratio of Ba to Ag for the doublesubstituted bulk. The orientation of BaxAgyCa28Co4O9 (y>0) bulks is prominently lower than that of Ca3Co4O9 and the orientation of Ba02Ca28Co4O9 bulk is higher than that of Ca3Co4O9 bulk. The electrical transport mechanism of the bulk with x=y=01 is changed slightly. The Ba01Ag01Ca28Co4O9 bulk exhibits simultaneously lowered orientation and moderately low resistivity and the resistivity reaches 73 mΩ·cm at 973 K. The Ag02Ca28Co4O9 bulk exhibits lowest orientation and lowest resistivity, reaching 63 mΩ·cm at 973 K.
    • 基金项目: 国家自然科学基金(批准号:50702003)和北京市教育委员会科技发展计划重点项目(批准号:KZ200310005001)资助的课题.
计量
  • 文章访问数:  6752
  • PDF下载量:  869
  • 被引次数: 0
出版历程
  • 收稿日期:  2008-09-11
  • 修回日期:  2008-10-17
  • 刊出日期:  2009-02-05

/

返回文章
返回