Crystal Structure and Thermal Expansion Properties of New Compound La2Cu0.8Ge3.
Crystal Structure and Thermal Expansion Properties of New Compound La2Cu0.8Ge3.
复制标题
DOI：
10.1002/chin.201002024
复制
发表时间：
2009-10
期刊：
影响因子：
--
通讯作者：
Jialin Yan;Xingwen Lu;Wenjun Shen;L. Zeng;Liangqin Nong
中科院分区：
文献类型：
--
作者：
Jialin Yan;Xingwen Lu;Wenjun Shen;L. Zeng;Liangqin Nong
合成并研究了一种新的三元化合物La_2Cu_（0.8）Ge_3。用Rietveld方法对La_2Cu_0.8Ge_3的X射线粉末衍射数据进行了结构修正。该化合物具有四面体α-ThSi_2结构，空间群为I41/amd（No.141），a = 0.42807（2）nm，c = 1.45626（6）nm，Z = 2，Dcalc = 6.931 g/cm ~ 3。采用高温粉末X射线衍射技术研究了La2Cu0.8Ge3在321 ~ 753 K温度范围内的热膨胀特性。结果表明，其晶胞参数随温度的升高而增大。平均晶格热膨胀系数为α 'a m = 1.17 × 10 - 5 K-1、α' c m = 1.09 × 10 - 5 K-1和α 'V m = 3.42 × 10 - 5 K-1。
Abstract A new ternary compound La2Cu0.8Ge3 was synthesized and studied. The crystal structure of La2Cu0.8Ge3 was refined from X-ray powder diffraction data by Rietveld method. The new compound was found to have a tetragonal α-ThSi2 structure with space group I41/amd (No. 141), and a = 0.42807(2) nm, c = 1.45626(6) nm, Z = 2 and Dcalc = 6.931 g/cm3. The thermal expansion properties of La2Cu0.8Ge3 were investigated using high-temperature powder X-ray diffraction technique in the temperature range from 321 K to 753 K. Results show that its unit-cell parameters increase with increasing temperature. The coefficients of average lattice thermal expansion are α ¯ a m = 1.17 × 10 − 5 K − 1 , α ¯ c m = 1.09 × 10 − 5 K − 1 and α ¯ V m = 3.42 × 10 − 5 K − 1 .