The microscopic defects have been investigated for crystal Tm3+/Yb3+:YVO4. These defects mainly include the inclusions (solid inclusions, bubbles and inclusions of the liquid phase), dendrites and growth stripes. They...The microscopic defects have been investigated for crystal Tm3+/Yb3+:YVO4. These defects mainly include the inclusions (solid inclusions, bubbles and inclusions of the liquid phase), dendrites and growth stripes. They are caused by in-pure raw materials, unstable growth conditions, super-cooling component and so on. Tm3+/Yb3+:YVO4 crystals of large size and excellent optical quality are grown by improving the growth conditions to eliminate these defects.展开更多
采用普通陶瓷工艺制备了Sm^(3+)掺杂的Co_2Z型平面六角铁氧体,研究了Sm^(3+)掺杂Co_2Z型铁氧体材料的组织结构和吸波性能。结果表明,掺杂一定量Sm^(3+)的铁氧体相结构仍以Co_2Z型六角晶系相为主相,但出现了呈颗粒状弥散分布的富Sm相。掺...采用普通陶瓷工艺制备了Sm^(3+)掺杂的Co_2Z型平面六角铁氧体,研究了Sm^(3+)掺杂Co_2Z型铁氧体材料的组织结构和吸波性能。结果表明,掺杂一定量Sm^(3+)的铁氧体相结构仍以Co_2Z型六角晶系相为主相,但出现了呈颗粒状弥散分布的富Sm相。掺杂Sm^(3+)样品的吸波性能明显优于未掺杂Sm^(3+)样品,在频率为6.3 GHz时,其最大反射损耗可达到-20 d B,耗损大于10 d B的频带带宽为5 GHz,具有较宽的吸收频带。吸波涂层的附着强度均大于10 MPa,具有良好的力学性能。展开更多
基金The work was supported by the National Natura1 Science Foundation of China(5997203)
文摘The microscopic defects have been investigated for crystal Tm3+/Yb3+:YVO4. These defects mainly include the inclusions (solid inclusions, bubbles and inclusions of the liquid phase), dendrites and growth stripes. They are caused by in-pure raw materials, unstable growth conditions, super-cooling component and so on. Tm3+/Yb3+:YVO4 crystals of large size and excellent optical quality are grown by improving the growth conditions to eliminate these defects.
文摘采用普通陶瓷工艺制备了Sm^(3+)掺杂的Co_2Z型平面六角铁氧体,研究了Sm^(3+)掺杂Co_2Z型铁氧体材料的组织结构和吸波性能。结果表明,掺杂一定量Sm^(3+)的铁氧体相结构仍以Co_2Z型六角晶系相为主相,但出现了呈颗粒状弥散分布的富Sm相。掺杂Sm^(3+)样品的吸波性能明显优于未掺杂Sm^(3+)样品,在频率为6.3 GHz时,其最大反射损耗可达到-20 d B,耗损大于10 d B的频带带宽为5 GHz,具有较宽的吸收频带。吸波涂层的附着强度均大于10 MPa,具有良好的力学性能。
