Abstract
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.
Original language | English |
---|---|
Pages (from-to) | 6234-6237 |
Number of pages | 4 |
Journal | Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers |
Volume | 42 |
Issue number | 9 B |
DOIs | |
State | Published - 1 Sep 2003 |
Keywords
- A(TO) phonon
- IR absorption
- Lithium niobate
- OH absorption
- Zn doped