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Synthesis and Reaction Chemistry of Nanosize Monosodium Titanate
Published on: February 23, 2016
La3Ni2O6:一种新的双T型尼基酸盐,具有无限的Ni1+/2+O2层
Viktor V Poltavets1, Konstantin A Lokshin, Sibel Dikmen
1Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 610 Taylor Road, Piscataway, New Jersey 08854, USA.
Journal of the American Chemical Society
|July 13, 2006
概括
研究人员合成了一种新的混合价值尼基酸盐,La3Ni2O6,具有独特的分层结构. 这一发现为材料科学和潜在应用提供了新的见解,因为它与超导酸盐相似.
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:
- 酸是一种具有多种电子和磁性特性的材料.
- T'-型结构 (Lan+1NinO2n+2) 已知与酸盐中的超导性有关.
- 超稳定相往往表现出在平衡材料中找不到的独特特性.
研究的目的:
- 为了合成和表征一种新的混合价值尼基酸盐,La3Ni2O6.6.
- 为了确定合成化合物的晶体结构和电子配置.
- 探索La3Ni2O6与已知的超导材料的结构关系.
主要方法:
- 使用化 (CaH2) 低温减少La3Ni2O7.
- 粉末中子衍射和瑞特维尔德分析用于结晶结构的确定.
- 用X射线吸收光谱 (XAS) 来确认氧化状态和协调.
主要成果:
- 在转移稳定的条件下,成功合成了一种新的混合价值尼基酸盐La3Ni2O6.
- 确定晶体结构作为LaO2化物和双无限层 (LaNiO2) 2块 (空间组I4 / mmm) 的杂交.
- 通过XAS确认混合Ni1+/Ni2+价值和平面Ni协调,与确定结构一致.
结论:
- 在T型系列中,La3Ni2O6代表了一种新的n=2同类物,具有前所未有的双T型结构布局.
- 电子配置 (3d9/3d8) 和NiO2无限层表明可能具有有趣的电子性质,类似于超导酸盐.
- 这一发现扩大了层状尼基酸盐的家族,并为探索结构-性质关系提供了一个新的平台.
相关概念视频
Ionic Compounds: Formulas and Nomenclature
An element composed of atoms that readily lose electrons (a metal) can react with an element composed of atoms that readily gain electrons (a nonmetal) to produce ions through complete electron transfer. The compound formed by this transfer is stabilized by the electrostatic attractions (ionic bonds) between the oppositely charged ions.
Ionic Bonding and Electron Transfer
Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.
Lewis Structures of Molecular Compounds and Polyatomic Ions
To draw Lewis structures for complicated molecules and molecular ions, it is helpful to follow a step-by-step procedure as outlined:
Resonance
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N-O and N=O bonds.
Ionic 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...
Resonance and Hybrid Structures
According to the theory of resonance, if two or more Lewis structures with the same arrangement of atoms can be written for a molecule, ion, or radical, the actual distribution of electrons is an average of that shown by the various Lewis structures.
Resonance Structures and Resonance Hybrids
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.
Resonance Structures and Resonance Hybrids
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.

