Issue |
EPL
Volume 91, Number 3, August 2010
|
|
---|---|---|
Article Number | 36002 | |
Number of page(s) | 5 | |
Section | Condensed Matter: Structural, Mechanical and Thermal Properties | |
DOI | https://doi.org/10.1209/0295-5075/91/36002 | |
Published online | 31 August 2010 |
Investigations of the OH− absorption bands in congruent and near-stoichiometric LiNbO3:Hf crystals
1
School of Material Science and Engineering, Hebei University of Technology - Tianjin 300130, China
2
Department of Physics, Tianjin Urban Construction Institute - Tianjin 300384, China
3
The MOE Key Laboratory of Weak-Light Nonlinear Photonics, Nankai University - Tianjin 300457, China
Received:
21
April
2010
Accepted:
2
August
2010
OH− absorption bands of both congruent and near-stoichiometric LiNbO3:Hf crystals were investigated. The abrupt blueshift of OH− absorption bands was found between the doping levels of 2 and 2.5 mol% in the congruent crystals, which confirms the exact optical-damage threshold for Hf doping. The absorption difference of OH− bands between the congruent and near-stoichiometric crystals shows that after Li incorporation H+ ions no longer prefer the sites of 3500 cm−1. Moreover, with the increase of Hf doping in the near-stoichiometric crystals, H+ ions were found to gradually transfer to the sites of 3489 cm−1. These results are explained by the breakdown of the association of HfNb− and H+ ions and the subsequent redistribution of H+ ions around HfLi3+ ions in VLi−-deficient lattice. Additionally, the link between the intrinsic defects and how they influence the optical-damage threshold upon adding Hf was discussed in detail.
PACS: 61.72.-y – Defects and impurities in crystals; microstructure / 77.84.Ek – Niobates and tantalates / 78.30.-j – Infrared and Raman spectra
© EPLA, 2010
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