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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)]。
A Mg - doped nearly stoichiometric lithium niobate (LiNbO3) crystal with φ40mm × 60mm was grown from a Li - rich [Li2O / Nb2O5] = 58.5 / 41.5] melt using an improved pull technique. The content of niobium (Nb5 +) and magnesium (Mg2 +) in the crystal was analyzed by X-ray fluorescence spectroscopy. The structure of the defects in the crystal was studied by UV absorption and infrared absorption peak. It was preliminarily concluded that the doping concentration of Mg2 + in the crystal had reached the threshold of light damage. The specific heat capacity [0.69J / (g · K)] of the growing crystal is higher than the specific heat capacity [0.64J / (g · K)] of LiNbO3 crystal.