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相关概念视频

Ionic Crystal Structures02:42

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...
Coordination Number and Geometry02:57

Coordination Number and Geometry

For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
Valence Bond Theory02:42

Valence Bond Theory

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...
Ionic Compounds: Formulas and Nomenclature03:34

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.
Structural Isomerism02:34

Structural Isomerism

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 be...
Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

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...

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相关实验视频

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Chemical Precipitation Method for the Synthesis of Nb2O5 Modified Bulk Nickel Catalysts with High Specific Surface Area
08:13

Chemical Precipitation Method for the Synthesis of Nb2O5 Modified Bulk Nickel Catalysts with High Specific Surface Area

Published on: February 19, 2018

一个 (3 + 3) 维的"超立方体"氧化物离子导体:II型Bi2O3-Nb2O5O3.

Chris D Ling1, Siegbert Schmid, Peter E R Blanchard

  • 1School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia. chris.ling@sydney.edu.au

Journal of the American Chemical Society
|April 11, 2013
PubMed
概括

在室温下与过渡金属稳定 bismuth 氧化物 (δ-Bi2O3),形成复杂的超立方体结构. 我们解决了一个这样的结构,揭示了一个"膨胀"的火和有序的空白,解释了它的高离子导电性.

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A Facile Synthetic Method to Obtain Bismuth Oxyiodide Microspheres Highly Functional for the Photocatalytic Processes of Water Depuration
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A Facile Synthetic Method to Obtain Bismuth Oxyiodide Microspheres Highly Functional for the Photocatalytic Processes of Water Depuration

Published on: March 29, 2019

Atomically Defined Templates for Epitaxial Growth of Complex Oxide Thin Films
08:49

Atomically Defined Templates for Epitaxial Growth of Complex Oxide Thin Films

Published on: December 4, 2014

相关实验视频

Last Updated: May 12, 2026

Chemical Precipitation Method for the Synthesis of Nb2O5 Modified Bulk Nickel Catalysts with High Specific Surface Area
08:13

Chemical Precipitation Method for the Synthesis of Nb2O5 Modified Bulk Nickel Catalysts with High Specific Surface Area

Published on: February 19, 2018

A Facile Synthetic Method to Obtain Bismuth Oxyiodide Microspheres Highly Functional for the Photocatalytic Processes of Water Depuration
09:09

A Facile Synthetic Method to Obtain Bismuth Oxyiodide Microspheres Highly Functional for the Photocatalytic Processes of Water Depuration

Published on: March 29, 2019

Atomically Defined Templates for Epitaxial Growth of Complex Oxide Thin Films
08:49

Atomically Defined Templates for Epitaxial Growth of Complex Oxide Thin Films

Published on: December 4, 2014

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:

  • 石棉氧化物 (Bi2O3) 在其高温立方相 (δ-Bi2O3) 中表现出极好的氧化物离子导电性.
  • 在较低的温度下稳定 δ-Bi2O3 往往涉及兴奋剂,导致复杂的调制结构,这些结构的理解很差.
  • 这些复杂的结构阻碍了基于Bi2O3的材料在固体氧化物燃料电池等应用中得到充分利用.

研究的目的:

  • 量化解决和完善一个复杂的 (3+3) 维不相称地调节的Bio2O3系统的超立方结构.
  • 阐明这些材料中高氧化物离子导电性的结构基础.
  • 了解稳定 δ-Bi2O3.3 中结构,兴奋剂和离子运输之间的关系.

主要方法:

  • 使用新的反流浮带方法,生长一个厘米尺度的单晶.
  • 收集高质量的单晶中子衍射数据.
  • 在超空间对称形式主义中使用X射线和中子衍射数据的结构解决方案和改进.

主要成果:

  • 该结构成功地被解决和完善,揭示了一个"膨胀"的火结构.
  • 连接在角落中的NbO6八面体链通过分开来容纳固体溶液.
  • 发现氧化物空缺部分在八面体链中排序,部分分布在3D通道网络中.

结论:

  • 解决的超立方体结构提供了对稳定 δ-Bi2O3.3 的定量理解.
  • 由"膨胀"的火结构促进的广泛的Bi2O3类通道的3D网络,负责高氧化物离子导电性.
  • 这项工作为设计和优化基于Bi2O3的离子导体铺平了道路.