関連する実験動画
Updated: Jun 21, 2026

09:41
Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides
Published on: May 29, 2018
新しいタイプの化合物である酸化炭化物ScalOCの合成,構造,結合,および性質
Melanie Schroeder1, Harald Hillebrecht
1Albert-Ludwigs-Universität Freiburg, Institut für Anorganische und Analytische Chemie, Albertstr. 21, D-79104 Freiburg, Germany.
Journal of the American Chemical Society
|August 7, 2009
まとめ
スカンジウムアルミニウム酸化炭素化物 (ScAlOC) の結晶を合成し,特徴づけました. この新しい移行金属化合物は,ユニークな結晶構造と電子特性を持ち,材料科学における潜在的な応用がある.
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
- クリスタルグラフィーです.
背景:
- スカンジウムアルミニウム酸化炭素 (ScAlOC) は新しい化合物である.
- その合成と特性を理解することは,材料の開発に不可欠です.
研究 の 目的:
- ScAlOC.の単結晶を合成するために.
- 結晶構造と結合特性を決定する.
- その電子的および機械的性質を調査するために.
主な方法:
- アルミニウム溶融における高温合成.
- 単一結晶X線微分分析. 単一結晶X線微分分析. 単一結晶X線微分分析. 単一結晶X線微分分析. 単一結晶X線微分分析. 単一結晶X線微分分析. 単一結晶X線微分分析.
- バンド構造の計算と電荷密度の分析.
主要な成果:
- ScAlOC結晶は1600°Cで成功して合成されました.
- AlNとScNから派生した結晶構造 (空間群R3m) を決定した.
- アニオンの有序分布と特定の協調多面体 (AlC3O,ScO6,ScC6) が特定されました.
- 電子帯域構造の計算により,0.6 eVの間接帯域ギャップが明らかになった.
- この材料は,有意な共振的貢献を持つ主にイオン結合を示しています.
- マイクロ硬さは9.0GPaで測定され,熱安定性は不活性大気中の1300°Cまで評価されました.
結論:
- ScAlOCは,移行金属酸化物炭化物の新しいクラスを表しています.
- そのユニークな構造と性質は,潜在的な応用のためのさらなる調査を正当化します.
関連する概念動画
Structures of Aldehydes and Ketones
Vanillin—a flavoring agent in vanilla, cinnamaldehyde—a molecule responsible for the distinct smell of cinnamon, and acetone—a strong-smelling ingredient in nail polish removers, all belong to a class of carbonyl compounds called aldehydes and ketones (Figure 1). Although both aldehydes and ketones contain the characteristic carbonyl (C=O) bond, their chemical structures vary with respect to the groups directly attached to the carbonyl carbon.
In aldehydes (Figures 1a and 1b), the carbonyl...
In aldehydes (Figures 1a and 1b), the carbonyl...
Network Covalent Solids
Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
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...
Properties of Organometallic Compounds
Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
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...
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.
