兰二氧化的流水晶生长与兰依赖的协调数变异的双vanadates
Hunter B Tisdale1,2, Hans-Conrad Zur Loye1,2
1Center for Hierarchical Waste form Materials, Columbia, South Carolina 29208, USA. zurloye@mailbox.sc.edu.
Dalton transactions (Cambridge, England : 2003)
|January 9, 2026
概括
研究人员合成了稀土双瓦纳,发现了瓦纳的新玻璃岩结构修饰,并证实了其他稀土的已知结构. 本书详细介绍了它们的合成和结构变异.
科学领域:
- 固态化学 固态化学
- 无机化学 无机化学
- 材料科学 材料科学 材料科学
背景情况:
- 稀土双瓦纳是各种领域潜在应用的化合物.
- 玻璃岩结构类型是无机材料中常见的图案,但可以发生变化.
- 了解结构属性关系对于材料开发至关重要.
研究的目的:
- 为了合成和表征一系列的稀土双瓦纳酸盐,其固态度为K3Ln{\displaystyle K3Ln}{\displaystyle K3Ln}{\displaystyle K3Ln}{\displaystyle K3Ln}{\displaystyle K3Ln}{\displaystyle K3Ln}{\displaystyle K3Ln}{\displaystyle K3Ln}{\displaystyle K3Ln}{\displaystyle K3Ln}{\displaystyle K3Ln}{\displaystyle K3Ln}{\displaystyle K3Ln}{\displaystyle K3Ln}{\displaystyle K3Ln}{\displaystyle K3Ln}{\displaystyle K3Ln}{\displaystyle K3Ln}{\displaystyle K3Ln}{\displaystyle K3Ln}{\displaystyle K3Ln}{\displaystyle K3Ln}
- 根据稀土元素,研究本系列中的结构多样性.
- 探索离子大小对晶体结构和协调数的影响.
主要方法:
- 单晶合成使用化/化流.
- 用X射线衍射来确定结构.
- 晶体分析用于描述结构特征和协调环境.
主要成果:
- 成功合成了K3Ln(VO4) 2的单晶,其中Ln=La,Pr,Nd和Sm.
- K3La(VO4) 2结晶在一种新的玻璃石结构修饰 (空间组P21/c) 中,与典型的玻璃石不同.
- K3Pr ((VO4) 2 ,K3Nd ((VO4) 2) 和K3Sm ((VO4) 2) 是与酸盐类似物 (空间组P21/m) 相同结构的.
- 在K3La(VO4) 2结构中,观察到兰化物协调号从7到8的变化.
结论:
- 合成产生了具有独特结构特征的稀土双瓦纳酸盐.
- 拉3+的较大的离子半径影响了晶体结构,导致了新的玻璃石修饰.
- 该研究强调了玻璃岩结构类型对稀土离子大小和协调偏好的敏感性.
相关概念视频
Ionic Crystal Structures
16.8K
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...
16.8K
Crystal Field Theory - Octahedral Complexes
30.6K
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...
30.6K
Crystal Field Theory - Tetrahedral and Square Planar Complexes
48.1K
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,...
48.1K
Valence Bond Theory
11.2K
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...
11.2K
Lattice Centering and Coordination Number
11.4K
The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
Imagine taking a large number of identical...
Types of Unit Cells
Imagine taking a large number of identical...
11.4K
Crystal Growth: Principles of Crystallization
4.7K
Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent...
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent...
4.7K


