A1(TO) phonons and OH- absorption spectra of Zn-doped lithium niobate crystals were measured by Raman and infrared spectroscopies at room temperature. Zn doping concentrations are from 0 to 8.1 mol.%. The characterizations of A1(TO)-phonon lineshapes and OH- absorption bands as a function of Zn concentration were carried out. The results revealed from Raman and OH- absorption analyses show consistency in the changes of phonon lineshapes and OH- absorption bands. The spectra revealed three different stages of Zn substitution. Based on the Li-vacancy model, the proposed Zn substitution mechanism is: (i) below 5.3 mol.%, Zn atoms replace Li atoms and the total number of Li vacancies is reduced; (ii) from 5.3 to 7.5 mol.% doping, Zn atoms still replace Li atoms but the number of vacancies increases; (iii) above 7.5 mol.% doping, Zn atoms start to replace Nb atoms.
|頁（從 - 到）||6234-6237|
|期刊||Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers|
|出版狀態||已發佈 - 2003 九月 1|
ASJC Scopus subject areas
- Physics and Astronomy(all)