Crystal structure and high temperature X-ray diffraction study of thermoelectric chimney-ladder FeGeγ (γ = 1.52)
Crystal structure and high temperature X-ray diffraction study of thermoelectric chimney-ladder FeGeγ (γ = 1.52)
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热电烟囱梯FeGeγ(γ=1.52)的晶体结构及高温X射线衍射研究
DOI：
10.1016/j.jallcom.2020.155696
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发表时间：
2020
影响因子：
6.2
通讯作者：
Berthebaud David
中科院分区：
文献类型：
--
作者：
Le Tonquesse Sylvain;Hassam Christopher;Michiue Yuichi;Matsushita Yoshitaka;Pasturel Mathieu;Mori Takao;Suzuki Tohru S.;Berthebaud David
用X射线衍射法研究了300 ~ 850 K温度范围内Nowotny烟囱状梯状相FeGeγ（γ = 1.52）的晶体结构。考虑到无公度复合晶体结构，通过Rietveld精修拟合衍射图案。详细描述了FeGeγ的细化晶体结构，并与γ = 1.74的热电材料MnSiγ进行了比较。晶格参数a、cFe和cGe随温度的升高遵循多项式规律，而调制矢量分量γ在包析分解为FeGe和FeGe 2之前保持不变。在所考虑的温度范围内，线性和体积热膨胀参数分别从约3 × 10− 6 K − 1增加到10 × 10− 6 K − 1和从9.6 × 10− 6 K − 1增加到31.5 × 10− 6 K −1。
The crystal structure of Nowotny chimney-ladder phase FeGeγwith γ ≈ 1.52 was studied by X-ray diffractometry from 300 K to 850 K. The diffraction patterns were fitted by Rietveld refinement considering an incommensurate composite crystal structure. The refined crystal structure of FeGeγis described in details and compared to MnSiγ, a thermoelectric material with γ ≈ 1.74. The lattice parametersa,cFeandcGewere found to increase with the temperature following a polynomial law, while the modulation vector component γ remained constant up to the peritectoid decomposition into FeGe and FeGe2. Within the temperature range considered, the linear and volumetric thermal expansion parameters increased from about 3 × 10−6K−1to 10 × 10−6K−1and from 9.6 × 10−6K−1to 31.5 × 10−6K−1, respectively.