![The Synthesis of [Sn10(Si(SiMe3)3)4]2- Using a Metastable Sn(I) Halide Solution Synthesized via a Co-condensation Technique](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F54498.jpg&w=3840&q=50)
Mn14Al56+xGe3-x (x = 0-0.6):かつてない"半壊した"マッケイイイコサヘドラを構成する新しいインターメタリックフェーズ
1Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona, USA.
Journal of the American Chemical Society
|April 1, 2004
まとめ
独特の構造を持つ新しいマンガン・アルミニウム・ゲルマニウム化合物が合成されました. 部分的に破壊されたイコサヘドラにも関わらず,その電子特性は最適化された結合と金属性の低下を示しています.
科学分野:
- マテリアルサイエンス 材料科学
- 固体化学 固体化学
- クリスタログラフィーです.
背景:
- マッケイ・イコサヘドラは,多くの金属間化合物の重要な構造モチーフである.
- 新しい材料の構造-特性関係を理解することは,技術的進歩にとって不可欠です.
研究 の 目的:
- 新しいMn-Al-Ge化合物を合成し,特徴づけること.
- 構造変化が電子および磁気特性に与える影響を調査する.
主な方法:
- Mn14Al56+xGe3-x (x = 0-0.6) 化合物の合成について.
- 物理的性質の測定 (抵抗力,磁気感受性).
- 電子構造計算 (バンド構造分析).
主要な成果:
- 部分的に破壊されたマッケイイイコサヘドラの新しい構造タイプが特定されました.
- 電子バンド構造分析により,最適化された化学結合が確認されました.
- レジスティビティ測定では,金属性が薄く,一部のサンプルでは温度に依存する行動を示した.
- 小さなキュリー成分を持つパウリパラマグネティズムが観察されました.
結論:
- 新しいMn-Al-Ge化合物は,結合に意味を持つユニークな構造特性を表しています.
- 構造的な偏差にもかかわらず,電子的な性質は維持され,構造の適応性を示唆しています.
- 観測された電子および磁気特性は,帯域構造の計算と一致しています.
さらに関連する動画
05:50Facile Preparation of Ultrafine Aluminum Hydroxide Particles with or without Mesoporous MCM-41 in Ambient Environments
Published on: May 11, 2017
14:51An Available Technique for Preparation of New Cast MnCuNiFeZnAl Alloy with Superior Damping Capacity and High Service Temperature
Published on: September 23, 2018
関連する概念動画
03:06Alkali Metals
Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
Table 1: Properties of the alkali metals
02:42Ionic 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...
02:37Metallic Solids
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. Many...
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...
02:51Metal-Ligand Bonds
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
01:09Complexation Equilibria: Factors Influencing Stability of Complexes
In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
01:29Imperfections in Crystal Structure: Non-Stoichiometric Defects
Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...