相关实验视频
Updated: Jul 12, 2026
08:14
Atom Probe Tomography Analysis of Exsolved Mineral Phases
Published on: October 25, 2019
概括
发现了一种与 pseudobrookite 系列相关的新型矿物. 它的结晶,以及相关的矿物质,表明形成在高降解条件下与高含量在olivine.
科学领域:
- 矿物学是什么?矿物学是什么?
- 地质化学 地质化学
- 石化学 石化学是一门学科.
背景情况:
- 伪布鲁基特矿物质系列已知来自各种地质环境.
- 了解结晶条件可以了解矿石的形成和地质过程.
研究的目的:
- 报告发现和描述一种新的矿物种.
- 确定新矿物和相关相的结晶条件.
- 为了调查的存在和状态在共存的橄.
主要方法:
- 用电子探针微分析 (EPMA) 检测矿物成分.
- 用于矿物研究的光学吸收光谱.
- 矿物质组合的岩石学分析.
主要成果:
- 确定了一种新矿物质,其近似式为Fe(0.5) Mg(0.5) Ti(2) O(5),与伪布鲁基特系列相关.
- EPMA揭示了共存的伊尔梅尼特和的乌尔夫斯皮内尔-伊尔梅尼特组合.
- 分析数据表明,结晶发生在高度还原条件下.
- 样本中的橄含有异常高的度 (1400 ppm),可能为Cr2+).
结论:
- 这一发现扩大了已知的矿物学, Pseudobrookite系列.
- 这些发现强调了在极端减少环境下矿物质形成的潜力.
- 橄中高Cr2+) 含量为极度减少的岩条件提供了特定的指标.
相关概念视频
02:58Properties of Transition Metals
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
02:42Ionic Crystal Structures
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
03:14Oxidation Numbers
In redox reactions, the transfer of electrons occurs between reacting species. Electron transfer is described by a hypothetical number called the oxidation number (or oxidation state). It represents the effective charge of an atom or element, which is assigned using a set of rules.