采用共沉淀法制备了三元材料LiNi0.4Co0.2Mn0.4O2,掺杂不同比例铷进行改性,对其进行了结构表征,考察了其电化学性能.结果表明,Li0.97Rb0.03Ni0.4Co0.2Mn0.4O2样品的结晶度较好,铷掺杂起到了稳定三元材料晶体结构的作用,有效改善了材料...采用共沉淀法制备了三元材料LiNi0.4Co0.2Mn0.4O2,掺杂不同比例铷进行改性,对其进行了结构表征,考察了其电化学性能.结果表明,Li0.97Rb0.03Ni0.4Co0.2Mn0.4O2样品的结晶度较好,铷掺杂起到了稳定三元材料晶体结构的作用,有效改善了材料的电化学性能,5C倍率下放电比容量达130 m A×h/g.展开更多
Nd3+:GdAl3(BO3)4 (NGAB) crystal with the size of 30 mm was grown from the solvent system of K2O-Gd2O3-MoO3-B2O3 by combining accelerated seed rotation technology with medium seeded solution growth (MSSG) method, and i...Nd3+:GdAl3(BO3)4 (NGAB) crystal with the size of 30 mm was grown from the solvent system of K2O-Gd2O3-MoO3-B2O3 by combining accelerated seed rotation technology with medium seeded solution growth (MSSG) method, and its crystal structure has been determined by X-ray powder diffraction. It crystallizes in the trigonal system, space group R32 with a = 9.2734(2), c = 7.2438(1) ? V = 538 ?, Z = 3 and Dc = 4.379 g/cm3. The absorption and emission spectra of NGAB in the function of s and polarizations at room temperature have been measured. UV generation tuneable in 378～382 nm, green (531 nm) generation and blue generation tuneable in 436～443 nm as well as red (669 nm) generation by self-frequency changing were obtained with the output of 105, 119.5, 445 and 19 mJ/pulse, respectively, when the crystal was pumped by a dye laser.展开更多
采用溶剂热法合成了Na Bi F4:Yb^3+/Er^3+上转换发光纳米材料,讨论了在溶剂热阶段反应温度、反应时间对Na Bi F4:Yb^3+/Er^3+物相组成、形貌及发光性能的影响。结果表明:在反应阶段,适当增加反应温度、延长反应时间,可以增强Na Bi F4:Yb...采用溶剂热法合成了Na Bi F4:Yb^3+/Er^3+上转换发光纳米材料,讨论了在溶剂热阶段反应温度、反应时间对Na Bi F4:Yb^3+/Er^3+物相组成、形貌及发光性能的影响。结果表明:在反应阶段,适当增加反应温度、延长反应时间,可以增强Na Bi F4:Yb^3+/Er^3+的结晶度,进而提高上转换发光效率,但溶剂热阶段反应温度高于220℃时,容易生成金属铋。此外,通过Rb^+离子掺杂可进一步增强Na Bi F4:Yb^3+/Er^3+的上转换发光强度。Rb^+掺杂量为5%(摩尔分数)时,绿光和红光分别增加至原来的1.73和1.5倍。最后基于荧光强度比(IFIR)技术,研究了样品在300~500 K温度范围的IFIR变化曲线,结果表明:Na Bi F4:Yb^3+/Er^3+样品在温度传感领域有潜在应用价值。展开更多
文摘采用共沉淀法制备了三元材料LiNi0.4Co0.2Mn0.4O2,掺杂不同比例铷进行改性,对其进行了结构表征,考察了其电化学性能.结果表明,Li0.97Rb0.03Ni0.4Co0.2Mn0.4O2样品的结晶度较好,铷掺杂起到了稳定三元材料晶体结构的作用,有效改善了材料的电化学性能,5C倍率下放电比容量达130 m A×h/g.
基金Supported by the Natural Science Foundation of Fujian province (2000F007)
文摘Nd3+:GdAl3(BO3)4 (NGAB) crystal with the size of 30 mm was grown from the solvent system of K2O-Gd2O3-MoO3-B2O3 by combining accelerated seed rotation technology with medium seeded solution growth (MSSG) method, and its crystal structure has been determined by X-ray powder diffraction. It crystallizes in the trigonal system, space group R32 with a = 9.2734(2), c = 7.2438(1) ? V = 538 ?, Z = 3 and Dc = 4.379 g/cm3. The absorption and emission spectra of NGAB in the function of s and polarizations at room temperature have been measured. UV generation tuneable in 378～382 nm, green (531 nm) generation and blue generation tuneable in 436～443 nm as well as red (669 nm) generation by self-frequency changing were obtained with the output of 105, 119.5, 445 and 19 mJ/pulse, respectively, when the crystal was pumped by a dye laser.
文摘采用溶剂热法合成了Na Bi F4:Yb^3+/Er^3+上转换发光纳米材料,讨论了在溶剂热阶段反应温度、反应时间对Na Bi F4:Yb^3+/Er^3+物相组成、形貌及发光性能的影响。结果表明:在反应阶段,适当增加反应温度、延长反应时间,可以增强Na Bi F4:Yb^3+/Er^3+的结晶度,进而提高上转换发光效率,但溶剂热阶段反应温度高于220℃时,容易生成金属铋。此外,通过Rb^+离子掺杂可进一步增强Na Bi F4:Yb^3+/Er^3+的上转换发光强度。Rb^+掺杂量为5%(摩尔分数)时,绿光和红光分别增加至原来的1.73和1.5倍。最后基于荧光强度比(IFIR)技术,研究了样品在300~500 K温度范围的IFIR变化曲线,结果表明:Na Bi F4:Yb^3+/Er^3+样品在温度传感领域有潜在应用价值。
