高度相关的结构,局部结构,拉曼光谱和磁性特征的替代Cu2V2O7
A Das1, S K Neogi2, A Banerjee1,3
1Department of Physics, University of Calcutta, 92 A.P.C. Road, Kolkata 700009, India.
Journal of physics. Condensed matter : an Institute of Physics journal
|September 4, 2023
概括
这项研究研究了一种量子自旋系统的Mn替代铜酸 (Cu2V2O7). 替代增强了磁性特性,如阿尔法相中的交换偏差,显示了磁电应用的潜力.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学 材料科学 材料科学
- 磁力学 磁力学 是一种
背景情况:
- 低维量子自旋系统对于新型电子设备至关重要.
- 铜酸 (Cu2V2O7) 具有有趣的磁性特性.
- 在Cu2V2O7中Mn替代是一个尚未探索的领域,具有潜在的应用.
研究的目的:
- 为了合成和表征Mn替代的Cu2V2O7化合物.
- 研究这些材料的结构,光谱和磁性特性.
- 探索Mn替代对量子自旋系统的影响.
主要方法:
- 用X射线衍射进行结构分析.
- 拉曼光谱用于振动模式.
- 对于局部结构和离子状态的X射线吸收光谱 (XAS).
- 对磁性质的温度和场依赖磁化测量.
主要成果:
- 所有合成的化合物 (Cu2-xMnxV2O7) 结晶在单一的 Orthorhombic 阿尔法相.
- 拉曼光谱显示了无和的声-声散射,但没有旋声合.
- 通过XAS确认了Cu2+,V5+和混合值Mn2+/Mn3+状态.
- 观察到抗铁磁性排序,耐兴奋剂独立的尼尔温度为32.5K.
- 通过Mn-substitution观察到增强的磁性歇斯底里和交换偏差.
结论:
- 在Cu2V2O7中的Mn替代不会改变晶体相,但会显著影响磁性行为.
- 2V2O7的α相表现出磁电应用的潜力.
- 建立了结构参数和磁交换相互作用之间的相关性.
更多相关视频
08:55Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
Published on: June 7, 2018
8.6K
06:49Radio Frequency Magnetron Sputtering of GdBa2Cu3O7âˆ'ÃŽ ´/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 STO Single-crystal Substrates
Published on: April 12, 2019
7.7K
相关概念视频
03:02Colors and Magnetism
11.8K
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...
11.8K
02:42Valence Bond Theory
8.7K
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...
8.7K
02:58Crystal Field Theory - Octahedral Complexes
26.7K
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...
26.7K
01:31Ferromagnetism
2.4K
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
2.4K
02:37Metallic Solids
18.5K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
18.5K
02:34Structural Isomerism
19.3K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
19.3K