ターノシリケートで,第2ハーモニック生成反応が強く一致する
Tzu-Ling Chao1, Wen-Jung Chang1, Shu-Han Wen1
1Department of Chemistry, National Central University , Zhongli, Taiwan 320, R.O.C.
Journal of the American Chemical Society
|July 15, 2016
まとめ
研究者らは高度なレーザー用水晶を開発しました これらの新しい非線形光学材料は,優れた周波数倍化の性質を示し,技術的な進歩のための有望な代替案を提供します.
科学分野:
- 材料科学
- 固体化学
- 光電子機器
背景:
- 非線形光学 (NLO) 材料は,レーザー技術にとって極めて重要です.
- 現存するNLO材料には,酸化物,リン酸,ボラート,およびフッ素ボラートが含まれます.
- NLOの有用な性質を持つ過渡金属シリケートについては,これまで報告されていません.
研究 の 目的:
- NLO特性を持つ新しい移行金属シリケート材料を合成し,特徴づけること.
- 新しいチタノシリケートの構造と光学特性を探求する.
- 周波数を倍増するアプリケーションにこれらの材料の適性を評価する.
主な方法:
- 流量と超臨界水熱法を使用して結晶合成.
- 合成されたチタノシリケートの構造分析
- 第2ハーモニックジェネレーション (SHG) の性質の評価
主要な成果:
- 2つの新しいチタノシリケート:Li2K4[(TiO) Si4O12]とLi2Rb4[(TiO) Si4O12]を成功して合成した.
- 圧縮されたTiO5ピラミッドで無限のTiOチェーンを形成する3Dフレーム構造を発見した.
- これらの材料は,効率的な第2ハーモニー生成のための重要な属性を持っていることを実証しました.
結論:
- 新しいチタノシリケートには 望ましい非線形光学特性がある.
- これらの材料は,レーザー技術における周波数倍化アプリケーションの魅力的な候補です.
- この発見は,移行金属シリケートに基づく高度なNLO材料の設計に新しい道を開きます.
関連する概念動画
03:10Precipitation Reactions
51.3K
In a precipitation reaction, aqueous solutions of soluble salts react to give an insoluble ionic compound – the precipitate. The reaction occurs when oppositely charged ions in solution overcome their attraction for water and bind to each other, forming a precipitate that separates out from the solution. Since such reactions involve the exchange of ions between ionic compounds in aqueous solution, they are also referred to as double displacement, double replacement, exchange reactions, or...
51.3K
02:48Ionic Bonding and Electron Transfer
46.7K
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.
46.7K
02:54Molecular and Ionic Solids
16.5K
Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
16.5K
02:42Ionic Crystal Structures
18.1K
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...
18.1K
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
47.6K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than...
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than...
47.6K
01:22Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction
1.4K
The radical dimerization of ketones or aldehydes gives vicinal diols through a pinacol coupling reaction. However, the behavior of titanium metals used for the reaction as a source of electrons is unusual. When the reaction is carried out in the presence of titanium, diols can be isolated at low temperatures. Else titanium further reacts with diols, forming alkenes through the McMurry reaction.
1.4K