概括
使用高分辨率显微镜研究了石榴石中的脱位核心结构. 观察到带有狭窄核心和堆叠故障的分离脱,挑战了以前基于杂质的理论.
科学领域:
- 材料科学 材料科学 材料科学
- 矿物物理 矿物物理
背景情况:
- 石榴石的位移对于理解地幔的气质学和材料特性至关重要.
- 之前的研究表明,杂质驱动石榴石脱位解离.
研究的目的:
- 为了研究石榴石中脱位核的原子结构.
- 为了澄清粗石石中脱位解离的机制.
主要方法:
- 接近原子分辨率的传输电子显微镜 (TEM).
主要成果:
- 观察到的离散失位是平行 a/4<111> 部分失位,由堆叠故障分开.
- 部分位移表现出狭窄的核心 (大约. 3 汉堡人的载体).
- 堆叠断层区域代表由于地点占用而不是杂质造成的低能耗配置.
结论:
- 石榴石脱位解离不是由可检测的杂质驱动的.
- 这些发现影响了人们对地幔矿物质质质学和变化的理解.
- 结果与材料科学中的陶有关.
相关概念视频
02:39Phase Transitions: Melting and Freezing
Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
01:24Mass Spectrum: Interpretation
An unknown compound can be established by identifying the molecular ion peak in the mass spectrum. The molecular ion peak is often weak or absent due to the predominance of fragmentation in high-energy electron beams. In such cases, a soft-energy electron beam can be used to scan the spectrum to enhance the intensity of the molecular ion peak. Additionally, chemical ionization, field ionization, and desorption ionization spectra are used to obtain a relatively intense molecular ion peak.To...