Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第16卷    第10期    总第91期    2006年10月

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文章编号:1004-0609(2006)10-1756-05
添加Ag、Sb对PbTe化合物组织与结构的影响
邱安宁, 蒋意靖, 张澜庭, 吴建生

(上海交通大学 材料科学与工程学院
教育部高温材料及测试开放实验室, 上海 200030
)

摘 要:  在不同冷却速度下制备几种不同成分的多元AgPbmSbTem+2(m=10、 14、 18)化合物并进行退火处理。 粉末X射线衍射结果表明, AgPbmSbTem+2具有与PbTe相同的面心立方结构。 微观组织分析表明, 自熔融状态快速冷却制备的化合物中存在严重的成分偏析, 晶界处有富Ag、 Sb相存在; 缓慢冷却试样中偏聚相较少; 退火处理后, 试样中的偏聚相消失。制备得到的AgPbmSbTe2+m化合物具有典型的枝晶结构。用内标法精确测定AgPbmSbTem+2的晶格常数,晶格常数随m值增大而单调增加; 减少化合物中的Ag含量,晶格常数增大。

 

关键词:  PbTe; 热电材料; 晶格常数; 微观组织

Lattice constant and microstructure of
Ag, Sb-alloyed PbTe
QIU An-ning, JIANG Yi-jing, ZHANG Lan-ting, WU Jian-sheng

Key Laboratory of the Ministry of Education for
High Temperature Materials and Testing,
School of Materials Science and Engineering,
Shanghai Jiao Tong University, Shanghai 200030, China

Abstract: A few multicomponent AgPbmSbTem+2 compounds with different compositions were synthesized under different cooling rates and then annealed. The powder X-ray diffraction shows that AgPbmSbTem+2 has the same crystal structure(fcc) as PbTe. The microstructure analysis indicates that severe segregation occurs in the compounds prepared by melt-quenching. The Ag-Sb-rich phase can be observed at the grain boundaries. In contrast, the compounds prepared by slow-cooling have little segregation. After annealed, this segregated phase disappears. The AgPbmSbTem+2 matrix displays a dendrite microstructure. The accurate lattice parameters were measured and calculated by the interpolation method. It is found that the lattice parameters vary monotonously with m and increase with reducing content of Ag.

 

Key words: PbTe; thermoelectric material; lattice constant; microstructure

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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