On the study of zinc doping in congruent LiTaO3 crystals
On the study of zinc doping in congruent LiTaO3 crystals
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DOI：
10.1016/j.matchemphys.2012.01.099
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发表时间：
2012-04
影响因子：
4.6
通讯作者：
J. Wu;Z. B. Chen;R. Choubey;C. Lan
中科院分区：
文献类型：
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作者：
J. Wu;Z. B. Chen;R. Choubey;C. Lan
采用提拉法生长了不同掺杂浓度的Zn掺杂同成分LiTaO3单晶。所生长的晶体是透明的且无空隙。晶体的组成（电感耦合等离子体原子发射光谱法（ICP-AES）），紫外吸收边，居里温度，折射率，和傅里叶变换红外光谱（FTIR）的测量进行了表征。在生长过程中，我们观察到，在一定量之后，由于其高挥发性和低分凝系数，很难向生长的晶体中添加更多的Zn。从ICP-AES研究中，我们还发现Li/Ta比随着Zn/Ta比的增加而降低。与未掺杂晶体相比，Zn掺杂晶体的吸收边发生蓝移。居里温度随着Zn浓度的增加而增加，并且通过FTIR研究了OH −离子的位置。
Zn-doped congruent LiTaO3single crystals have been grown by the Czochralski technique for various doping concentrations. The as-grown crystals were transparent and void-free. The crystals were characterized by the measurements of composition (by inductively coupled plasma atomic emission spectroscopy (ICP-AES)), UV absorption edge, Curie temperature, refractive index, and Fourier transform infrared spectroscopy (FTIR). During the growth we observed that after a certain amount, it was difficult to add more Zn into the grown crystal due to its high volatility and low segregation coefficient. From the ICP-AES study, we also found that the Li/Ta ratio was decreased with the increasing Zn/Ta ratio. The blue shift in absorption edge was observed in Zn doped crystals as compared with the undoped ones. The Curie temperature increased with the increasing Zn concentration and the position of OH−ions was studied by FTIR as well.