MPtxB6-2x (M = Y, Yb) 的电子和结构性质:八面体框架中的结构障碍
Leonid Salamakha1,2, Oksana Sologub1, Berthold Stöger3
1Institute of Solid State Physics, TU Wien, A-1040 Vienna, Austria.
Inorganic chemistry
|November 10, 2023
概括
新的三元玻化物YPtxB6-2x和YbPt_xB6-2x被合成并进行结构特征. 它们的复杂结构具有网和[B4Pt2]八面体,电子结构计算表明金属行为.
科学领域:
- 固态化学 固态化学
- 材料科学 材料科学 材料科学
- 无机化学 无机化学 有机化学
背景情况:
- 由于其独特的结构和电子特性,三级玻化物引起了人们的兴趣.
- 了解稀土金属--系统中的相位关系和晶体结构对于材料发现至关重要.
研究的目的:
- 在Y-Pt-B和Yb-Pt-B系统中合成和描述新的三元玻化物.
- 阐明新发现的化合物的晶体结构和结合特性.
- 在高温下探索Y-Pt-B系统的相位图.
主要方法:
- 弧化,然后在高温下化.
- 单晶X射线衍射用于结构确定.
- 分析结构变异的组-子组方法.
- 电子定位函数 (ELF) 和Bader电荷分析用于化学键.
- 电子结构计算 (状态密度).
主要成果:
- 成功合成了两个新的三元玻化物YPt_xB6-2x和YbPt_xB6-2x.
- 确定了它们的晶体结构,揭示了CaB6和AuCu3类型碎片与[B4Pt2]八面体的组合.
- 提出了两种结构模型 (I型和II型),它们在和的排序上有所不同.
- 化学结合分析表明,在[B4Pt2]八面体内存在共价相互作用,以及伊的阴离特征.
- 电子结构计算预测了YPt_xB6-2x.x的金属行为.
- Y-Pt-B 系统的相图显示了 YPt_xB6-2x 的同质场,以及另外三个三元相 (YPt2B,YPt3B,YPt5B2) 的存在.
结论:
- YPt_xB6-2x和YbPt_xB6-2x的合成和表征扩大了已知的三元玻化物家族.
- 复杂的晶体结构和结合提供了对这些材料的形成和稳定性的洞察.
- 对Y-Pt-B系统的探索确定了多个三元阶段,有助于理解这种物质系统.
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