Effect of stoichiometry on the thermal expansion coefficients of lithium niobate single crystals |
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| Authors: | Kamal Singh P V Saodekar S S Bhoga |
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| Affiliation: | (1) Department of Physics, Amravati University, 444 602 Amravati, India;(2) Department of Physics, Jagadamba Mahavidyalaya, 444 806 Achalpur, India;(3) Department of Physics, Hislop College, 440 001 Nagpur, India |
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| Abstract: | The chemical analysis of LiNbO3 single crystals, with different melt compositions (Li/Nb) m =0·945, 1·0, 1·1 and 1·2, grown by slow cooling technique, reveals a remarkable difference in solid and melt compositions. The thermal expansion coefficients alonga andc axes, determined by using Newton’s ring experiment, are found to increase anisotropically with increase in (Li/Nb) m ratio. The variation in thermal expansion coefficient with increase in the (Li/Nb) m ratio is discussed in the light of defect chemistry i.e. the partial replacement of Li+ by excess Nb5+ creates additional cation vacancies to attain the electro-neutrality in the crystal. |
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| Keywords: | Single crystal thermal expansion non-stoichiometry defects octahedra |
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