Anisotropic properties of self-flux grown LiB3O5 single crystals |
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Authors: | C.V. Kannan S. Ganesamoorthy R. Jayavel |
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Affiliation: | a Materials Engineering Laboratory, National Institute for Material Science, 1-2-1, Sengen, Tsukuba Ibaraki 305-0047, Japan b Laser Materials Development and Device Division, Centre for Advanced Technology, Indore 13, India c Crystal Growth Centre, Anna University, Chennai 25, India |
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Abstract: | In this paper, we report the existence of anisotropic behavior along the crystallographic axes in optical, electrical and thermal properties of lithium tri borate, a recently developed vacuum UV-NLO material. The variation of refractive index with the wavelength along the crystallographic axes was investigated by prism coupling method. The results of impedance spectroscopy measurement reveal the presence of a strong anisotropy in ionic conductivity and dielectric constant along the axes and also show the super-ionic conduction behavior along the c-axis with the activation energy of Δ∼0.20 eV. A thermo-mechanical study in the temperature range of 300-900 K indicates the existence of a strong variation in the linear thermal expansion coefficient (positive value along the a-axis, and negative value along the c-axis) of LiB3O5 crystals. |
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Keywords: | 66.30.Dn 77.22.Gm 72.20.&minus I |
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