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

非晶和纳米ZrO2·Y2O3(15%)的X射线衍射与扩展X射线吸收精细结构研究

戚泽明 施朝淑 王正 魏亚光 谢亚宁 胡天斗 李福利

引用本文:
Citation:

非晶和纳米ZrO2·Y2O3(15%)的X射线衍射与扩展X射线吸收精细结构研究

戚泽明, 施朝淑, 王正, 魏亚光, 谢亚宁, 胡天斗, 李福利

AMORPHOUS AND NANOCRYSTALLINE ZrO2·Y2O3(15%) STUDIED BY EXTENDED X-RAY ABSORPTION FINE STRUCTURE

QI ZE-MING, SHI CHAO-SHU, WANG ZHENG, WEI YA-GUANG, XIE YA-NING, HU TIAN-DOU, LI FU-LI
PDF
导出引用
  • 利用粉末X射线衍射和扩展X射线吸收精细结构(EXAFS)技术对用化学共沉淀法制备的非晶和纳米ZrO2·15%Y2O3体系进行了研究.粉末X射线衍射结果表明,300℃温度处理的样品呈非晶态,500℃时样品已经晶化,形成单一立方相的纳米结构.EXAFS分析显示,在从非晶态向纳米结构晶化的过程中,最近邻的ZrO配位层的配位数和键长没有发生明显的改变,说明300℃时已经形成和900℃相同的最近邻局域结构.而对于ZrZr(Y)配位层,随着晶粒尺寸的减
    Chemical coprecipitated amorphous and nanocrystalline ZrO2·Y2O3(15%) was studied by Powder X-ray diffraction(XRD) and extended X-ray absorption fine structure(EXAFS). XRD result shows that the sample is an amorphous phase annealed below 300℃; and it crystallizes into cubic nanocrystalline zirconia at 500℃. EXAFS analysis indicates that the coordination number and bond length of Zr-O shell has not changed when transforming from amorphous into nanocrystalline. This suggests that at 300℃,it has formed the same nearest-neighbor local structure as at 900℃. For Zr-Zr(Y) shell, with the reducing of grain size, the coordination number decreases obviously: the bond length is shorter and the disorder becomes larger. This result suggests that the grain size effect is much stronger for more distant coordination shell (Zr-Zr ) than for the first nearest-neighbor shell(Zr-O).
    • 基金项目: 国家自然科学基金(批准号:19974025)资助的课题.
计量
  • 文章访问数:  7588
  • PDF下载量:  962
  • 被引次数: 0
出版历程
  • 收稿日期:  2000-10-15
  • 修回日期:  2001-01-12
  • 刊出日期:  2001-07-20

/

返回文章
返回