振动和相位稳定性在混合价值氧化氧化中
Duncan H Moseley1, Rinkle Juneja1, Luke L Daemen2
1Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States.
Inorganic chemistry
|September 25, 2023
概括
这项研究调查了氧化相的稳定性,发现非静态度,而不是振动,可能会使α相稳定于β相. 这项研究阐明了混合价值化合物的特性.
科学领域:
- 材料科学 材料科学 材料科学
- 固态化学 固态化学
- 计算材料科学科学 计算材料科学
背景情况:
- 四氧化物存在于α (cervantite) 和β (clinocervantite) 阶段,两者都是混合的价值化合物 (SbIII SbV O4).
- 存在SbIII单对电子使其结构和性质的理论计算变得复杂.
研究的目的:
- 为了研究alpha-和beta-antimony tetroxide的网格动态和振动特性.
- 了解控制四氧化相稳定性的因素,特别是阿尔法相.
- 探索氧气空缺对这些化合物的固体测量和特性的影响.
主要方法:
- 不弹性的中子散射 (INS)
- 莫斯巴乌尔光谱法是使用的.
- 核无弹性散射 (NIS) 是指核无弹性散射.
- 密度函数理论 (DFT) 的计算,包括那些考虑单对电子和氧空缺的计算.
主要成果:
- 使用单双电子的DFT计算准确地复制了实验声状态密度.
- 莫斯巴乌尔光谱表明,β阶段比α阶段要困难得多.
- 计算表明,氧气空缺允许在两个阶段的非静脉测量SbIII/SbV比率.
- 发现振动的差异很小,这使得它们不太可能成为α相稳定的驱动因素.
结论:
- 阿尔法相对β相的稳定性很可能是由于非静态度而不是振动.
- 这些发现提供了对混合氧化物的复杂行为和缺陷的作用的见解.
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