在CaCu1.424Fe0.576Si2的基础上,的含量可以达到1.424%
Yangkun Dai1, Yibo Liu1, Marek Mihalkovic2
1State Key Laboratory of Metastable Materials Science and Technology Yanshan University,Qinhuangdao 066004 People's Republic of China.
IUCrData
|May 8, 2025
概括
在高压下合成了一种新的CaCuFeSi相. 这种新材料结晶在I4/mmm空间群中,并显示铜和铁原子的共同占用.
科学领域:
- 材料科学 材料科学 材料科学
- 固态化学 固态化学
- 晶体学 晶体学是指结晶学.
背景情况:
- 准晶体和相关的金属间相因其独特的特性而具有重大兴趣.
- 之前的研究已经确定了具有已知的晶体结构的相关Ca-Cu-Si和Ca-Fe-Si相.
研究的目的:
- 为了合成和描述一种在Si丰富的准晶预合金的高压烧结过程中形成的新相.
- 为了确定新获得的相的晶体结构和原子排列.
主要方法:
- 一种Si61Cu30Ca7Fe2预合金的高压烧结.
- 进行X射线衍射分析以确定晶体结构和晶格参数.
- 对共占原子的位置占用因子的改进.
主要成果:
- 一个新的阶段,CaCu1.424Fe0.576Si2,已成功合成.
- 该相结晶在I4/mmm空间组中,其格子参数为a = b = 4.041 Å,c = 10.010 Å.
- 铜和铁原子在特定的晶体学位点上表现出共同占用,其比率约为0.71:0.29.
结论:
- 合成的CaCuFeSi阶段与已知的CaCu2Si2和CaFe2Si2化合物具有同型性.
- 和铁原子的共同占用是这个新阶段的一个关键特征.
- 这一发现有助于理解在高压下富含Si的过渡金属系统中的相位形成.
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