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Effect of doping on the Raman modes in MgO-doped lithium niobate crystals

✍ Scribed by L. J. Hu; Y. H. Chang; M. L. Hu; M. W. Chang; W. S. Tse

Publisher
John Wiley and Sons
Year
1991
Tongue
English
Weight
332 KB
Volume
22
Category
Article
ISSN
0377-0486

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✦ Synopsis

Raman spectra of a series of MgO-doped congruent LiNbO, crystals were obtained with MgO concentrations up to 30 mole%. Single crystals were successfully grown and no precipitates were discovered. The intensity, frequency and line width of the Raman phonons were studied as a function of doping percentage. An abrupt change was observed near the composition of 7.5 mol.% of MgO-doped LiNbO, crystal. From the spectral changes it is proposed that Mg2+ replaces the mis-sited NbS+ cation at Li sites first. When these mis-sited Nbs+ cations have been completely replaced, the Mg" cation then replaces the Li+ cation and creates vacancies at Li+ sites

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