本文从固相反应温度、晶转速率、生长速率及降温速率几个方面,探索分析了采用提拉法生长大尺寸Yb∶CALGO晶体的工艺。通过对比不同温度下烧结反应后的多晶料XRD图谱发现,原料在1350℃可以充分反应,根据所生长晶体的开裂截面形貌与晶体...本文从固相反应温度、晶转速率、生长速率及降温速率几个方面,探索分析了采用提拉法生长大尺寸Yb∶CALGO晶体的工艺。通过对比不同温度下烧结反应后的多晶料XRD图谱发现,原料在1350℃可以充分反应,根据所生长晶体的开裂截面形貌与晶体表面光滑度来优化晶转速率和生长速率,通过变温拉曼光谱分析降温速率导致开裂的成因,结合不同降温速率获得了不同方向的晶面应力分布图,发现对于沿着c轴生长的Yb∶CALGO晶体来说,降温速率过快更容易导致(001)面的热应力积累,这也是导致晶体在退火过程中开裂的主要诱因。采用多种手段优化晶体生长工艺后,实现了ϕ50 mm×110 mm Yb∶CALGO晶体的稳定生长,晶体具有较低的散射损耗(0.001796 cm^(-1))和较高的光学均匀性(4.21×10^(-5)),可以实现多种尺寸和形状的晶体元件加工,为进一步研制Yb∶CALGO板条激光器和超快激光器提供技术支撑。展开更多
The synthesis, structural characterization and theoretical investigation of a novel alkoxo-bridged dinuclear copper(II) compound has been described. The title compound has the formula C22H28Cl2Cu2N8O11. It consists of...The synthesis, structural characterization and theoretical investigation of a novel alkoxo-bridged dinuclear copper(II) compound has been described. The title compound has the formula C22H28Cl2Cu2N8O11. It consists of dinuclear units with bridging methoxo groups. The ligands 2-amino-pyridine and 2-amino-6-hydroxyl-pyridine are linked to each copper via the pyridine N atoms respectively, providing a square planar CuN2O2 unit. The ClO4- anions in the title compound are semi-coordinated to copper ion at the distance of 0.265 83(4) nm (Cu-O(ClO4-). The Cu-Cu distances within the dinuclear units are 0.299 79(9) nm with Cu-O-Cu angles of 102.27(9)°. The structures are stabilized by intramolecular H-bonds between the amino hydrogen atoms and oxygen atoms. Based on crystal data, quantum chemistry calculation on DFT/B3LPY level was used to reveal the electronic structure of the title compound. CCDC: 270807.展开更多
文摘本文从固相反应温度、晶转速率、生长速率及降温速率几个方面,探索分析了采用提拉法生长大尺寸Yb∶CALGO晶体的工艺。通过对比不同温度下烧结反应后的多晶料XRD图谱发现,原料在1350℃可以充分反应,根据所生长晶体的开裂截面形貌与晶体表面光滑度来优化晶转速率和生长速率,通过变温拉曼光谱分析降温速率导致开裂的成因,结合不同降温速率获得了不同方向的晶面应力分布图,发现对于沿着c轴生长的Yb∶CALGO晶体来说,降温速率过快更容易导致(001)面的热应力积累,这也是导致晶体在退火过程中开裂的主要诱因。采用多种手段优化晶体生长工艺后,实现了ϕ50 mm×110 mm Yb∶CALGO晶体的稳定生长,晶体具有较低的散射损耗(0.001796 cm^(-1))和较高的光学均匀性(4.21×10^(-5)),可以实现多种尺寸和形状的晶体元件加工,为进一步研制Yb∶CALGO板条激光器和超快激光器提供技术支撑。
文摘The synthesis, structural characterization and theoretical investigation of a novel alkoxo-bridged dinuclear copper(II) compound has been described. The title compound has the formula C22H28Cl2Cu2N8O11. It consists of dinuclear units with bridging methoxo groups. The ligands 2-amino-pyridine and 2-amino-6-hydroxyl-pyridine are linked to each copper via the pyridine N atoms respectively, providing a square planar CuN2O2 unit. The ClO4- anions in the title compound are semi-coordinated to copper ion at the distance of 0.265 83(4) nm (Cu-O(ClO4-). The Cu-Cu distances within the dinuclear units are 0.299 79(9) nm with Cu-O-Cu angles of 102.27(9)°. The structures are stabilized by intramolecular H-bonds between the amino hydrogen atoms and oxygen atoms. Based on crystal data, quantum chemistry calculation on DFT/B3LPY level was used to reveal the electronic structure of the title compound. CCDC: 270807.
