Li/Nb摩尔比变化对Mg:Sc:Fe:LiNbO_3晶体光折变性能的影响  

EFFECT OF Li AND Nb MOLE RATIO ON PHOTOREFRACTIVE PROPERTIES OF Mg:Sc:Fe:LiNbO_3 CRYSTALS

作　　者：郑威[1] 桂强[1] 李光滨[1] 徐玉恒[2] 

机构地区：[1]哈尔滨理工大学材料与工程学院,哈尔滨150040 [2]哈尔滨工业大学应用化学系,哈尔滨150001

出　　处：《硅酸盐学报》2008年第8期1088-1092,共5页Journal of The Chinese Ceramic Society

基　　金：黑龙江省自然科学基金(E200512)资助项目

摘　　要：掺入摩尔分数为1%MgO,0.5%Sc2O3和质量分数为0.03%Fe2O3,从 Li与Nb 摩尔比分别为0.85,0.94,1.05,1.20和1.38的熔体中用提拉法生长Mg:Sc:Fe:LiNbO3(Mg:Sc:Fe:LN)晶体。测试了晶体的紫外–可见吸收光谱和红外光谱、抗光损伤能力、衍射效率、响应时间和光折变灵敏度。结果表明:随着Li/Nb摩尔比增加,Mg:Sc:Fe:LN 晶体的吸收边发生紫移;n(Li)/n(Nb)=1.05 的晶体分别在3466,3481cm–1和3504 cm–1处出现 OH–吸收峰;n(Li)/n(Nb)=1.38 的晶体在3504cm–1和 3535 cm–1处出现OH–吸收峰。随n(Li)/n(Nb)的增加,Mg:Sc:Fe:LN 晶体的衍射效率减小,响应速度和光折变灵敏度增大。n(Li)/n(Nb)=1.05 的近化学计量比 Mg:Sc:Fe:LN 晶体的抗光损伤能力最高。A series of Mg：Sc：Fe：LiNbO3 （Mg：Sc：Fe：LN） crystals doped with 1% （in mole, the same below） MgO and 0.5% Sc2O3 and with 0.03% （in mass） Fe2O3 were grown by Czochralski method from the melt with various mole ratios of Li to Nb （0.85, 0.94, 1.05, 1.20 and 1.38）. The infrared spectrum and ultraviolet-visible absorption spectrum, the photo-damage resistance, the diffi＇action efficiency, the response speed and photorefractive sensitivity of Mg：Sc：Fe：LN crystals were measured. The results show that with the Li/Nb mole ratios increasing, the absorption edge the Mg：Sc：Fe：LN crystals shifts to the violet. The OH^- absorption peak of the crystal with a Li/Nb mole ratio of 1.05 are located at 3 466, 3 481 and 3 504 cm^-1, respectively, and the OH^- absorption peak of the crystal with a Li/Nb mole ratio of 1.38 are located at 3 504 and 3 535 cm^-1. And that with the increase of Li/Nb mole ratios, the diffraction efficiency decreases, response speed and photoret^active sensitivity increases of the Mg：Sc：Fe：LN crystals. The photo-damage resistance ability of the.near-stoichiometric Mg：Sc：Fe：LN crystal with a Li to Nb mole ratio of 1.05 is the highest.

关 键 词：镁钪铁掺杂铌酸锂晶体 提拉法 光折变性能 红外光谱 

分 类 号：O734[理学—晶体学]