掺镁近化学计量比铌酸锂晶体的生长(英文)

GROWTH AND CHARACTERISTICS OF MAGNESIUM-DOPED NEAR-STOICHIOMETRIC LITHIUM NIOBATE CRYSTAL

用改进的提拉技术从富锂[摩尔比n(Li2O)/n(Nb2O5)=58.5/41.5]熔体中生长了φ40mm×60mm的掺镁近化学计量比铌酸锂(LiNbO3)晶体。利用X荧光光谱分析了晶体中铌离子(Nb5+)和镁离子(Mg2+)的含量。通过紫外吸收和红外吸收峰研究了晶体中缺陷的结构,初步断定晶体中Mg2+的掺杂浓度已达到抗光伤阈值的浓度。生长晶体的比热容[0.69J/(g.K)]高于同成分LiNbO3晶体的比热容[0.64J/(g.K)]。

An magnesium （MgO）-doped near-stoichiometric lithium niobate crystal （MgO：SLN） of 40 mm in diameter and 60 mm in length was grown by an improved Czochralski technique from a 58.5% （in molar fraction, the same below） Li melt doped with 2% MgO in a platinum crucible. The concentration of Nb^5＋ and Mg^2＋ in the growth crystal was measured by X-ray fluorescence. The defects structure of MgO：SLN was investigated by ultraviolet absorption spectra and infrared absorption spectra, The MgO：SLN crystal exhibited a shorter absorption edge wavelength, and the OH- infrared absorption band showed that the MgO doping concentralion of the MgO：SLN crystal exceeded the optical damage resistance threshold concentration. The specific heat capacity of the crystal was measured to be 0.69 J/（g·K） and was higher than that of congruent LiNbO3 （CLN） crystal 0,64 J/（g·K）.