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稀土含氮黄长石固溶体R2Si3-xAlxO3+xN4-x的X射线衍射研究

成薇; 王佩玲; 贾迎新   

  1. 中国科学院上海硅酸盐所高性能陶瓷和超微结构国家重点实验室; 上海200050
  • 收稿日期:1996-10-15 修回日期:1996-11-12 出版日期:1997-12-20 网络出版日期:1997-12-20

Study on X-ray Diffraction of Nitrogen-containing Rare Earth Melilite Solid Solutions R2Si3-xAlxO3+xN4-x

CHENG Wei; WANG Peiling; JIA Yingxin   

  1. State Key Lab on High Performance Ceramices Superfine Mirostructure; Shanghai Institute of Ceramics; Chinese Academy of Sciences Shanghai 200050 China
  • Received:1996-10-15 Revised:1996-11-12 Published:1997-12-20 Online:1997-12-20

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摘要： 用热压和无压烧结工艺，在1700～1800℃制备了含氮稀土黄长石固溶体R2Si3-xAlxO3+xN4-x（R＝Nd、Sm，x＝0、0．3、0．6、1．0、1．2；R＝Dy、Y，x＝0、0．3、0．6、1．0；R＝Yb，x=0、0．3）．利用Guinier-Hgg照相法，光密度计LS－18和相应的程序系统（SCAN，SCANPI和PIRUM）给出了稀土黄长石的X射线衍射图谱，精密测定了具有不同稀土元素和固溶量的黄长石固溶体的晶胞参数，并建立了Nd-，Sm-，Y-黄长石固溶体晶胞参数与Al实际固溶量x的关系式．晶胞参数的测定结果表明，具有相同x值的不同黄长石固溶体的晶胞大小随稀土离子半径的减小而变小，而同一稀土元素形成的黄长石固溶体的晶胞参数则随x值的增加而变大．

关键词: 稀土, 黄长石, X射线衍射

Abstract: Nitrogen-contatining rare earth melilite solid solutions of R2Si3-xAlxO3+xN4-x(R=Nd, Sm, x=0, 0.3, 0.6, 1.0,
1.2; R=Dy, Y, x=0, 0.3, 0.6, 1.0; R=Yb, x=0, 0.3) were prepared in the temperature range from 1700℃ to 1800℃ by pressureless sintering or hot-pressing techniques. The
X-ray diffraction patterns of rare earth melilite and cell dimensions of melilite solid solutions were obtatined by using. Guinier-Hagg film data,
densitometer LS--18 and SCAN, SCANPI, PIRUM programs. The relationship between cell dimensions and actual Al contents for Nd-, Sm-, Y-melilite solid
solutions was also given. The results of measurements of cell dimensions showed that the lattice parameters of melilite solid solutions with the different rare earth elements but the same x value reduced with decreasing the ionic radii of rare
earth elements, whereas the cell dimensions became larger for melilite solid solutions with the same rare earth but increasing x values.

Key words: rare earth, melilite, X-ray diffraction