(Ca0.5Mn0.5) 2MnTeO6 - 一种异常稳定的高压双重矿
Azizah Almadhi1, Kunlang Ji1, Sean D Injac1
1Centre for Science at Extreme Conditions (CSEC) and School of Chemistry, University of Edinburgh, Peter Guthrie Tait Road, EH9 3FD, Edinburgh, UK.
Chemistry, an Asian journal
|May 10, 2024
概括
对CaMnMnTeO6的高压处理产生了一个无序的双矿, (Ca0.5Mn0.5) 2MnTeO6.6. 这种材料表现出旋转玻璃行为,在5K处磁结,缺乏远程磁性秩序.
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:
- 配方A2BB'O6的双矿由于其多样化的结构和磁性特性而引起人们的兴趣.
- 双矿中的阴离子排序显著影响其物理特征.
研究的目的:
- 在高压和高温条件下研究CaMnMnTeO6的结构和磁性特性.
- 为了比较离子排序行为与相关的双矿类似物.
主要方法:
- 高压和高温合成.
- 用X射线衍射进行结构分析.
- 磁感应度测量和中子衍射用于磁性表征.
主要成果:
- 高压,高温处理CaMnMnTeO6完全形成A2BB'O6类型的双矿 (Ca0.5Mn0.5) 2MnTeO6.6.
- 合成的化合物结晶成一个单临结构 (空间组P21/n) 与失序的Ca2+和Mn2+离子.
- 磁性研究揭示了一个高度丧的旋转玻璃状态,在5K处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处处.
结论:
- 在研究条件下,CaMnMnTeO6不形成有序的AA'BB'O6双矿,与其Re和W类似物不同.
- (Ca0.5Mn0.5) 2MnTeO6表现出复杂的磁性挫折,这是旋转玻璃系统的特征.
- 的无序性质和磁离子 (Mn) 的特定排列有助于观察到的自旋玻璃行为.
更多相关视频
相关概念视频
02:42Ionic Crystal Structures
14.3K
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...
14.3K
03:02Colors and Magnetism
11.6K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
11.6K
02:42Valence Bond Theory
8.5K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
8.5K
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
42.4K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
42.4K
02:58Crystal Field Theory - Octahedral Complexes
26.4K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
26.4K
02:27Predicting Molecular Geometry
34.3K
VSEPR Theory for Determination of Electron Pair Geometries
34.3K