Proton-exchanged OH− absorption spectra of highly Zn-doped LiNbO3 with and without polarization inversion

Tsai, P. C.; Chia, Chih Ta; Lin, Shao Chieh; Huang, Yen Chieh; Lu, Hsiu‐Feng; Lin, Sheng Hsien

doi:10.1063/1.3089836

Cited by 3 publications

(2 citation statements)

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“…There have been many efforts-both theoretical [5][6][7][8][9][10][11][12][13][14] and experimental 3,[15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] -to investigate intrinsic and extrinsic defects. For undoped, congruent LNO each antisite Nb 6 Adding divalent and/or trivalent metal dopants produces extrinsic defects that modify important optical properties and also change the lattice constants, 17,30 particularly near and above the so-called threshold concentration of ∼7 mol %.…”

Section: Introductionmentioning

confidence: 99%

EXAFS evidence for a primary ZnLidopant in LiNbO3

et al. 2012

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We present extended x-ray-absorption fine structure (EXAFS) data as a function of temperature (10-300 K) at the Zn and Nb K edges for Zn-doped LiNbO 3. The focus is on higher Zn concentrations (7-11 mol %) for which there is disagreement in the literature as to the substitution site for Zn. Our data show that Zn substitutes only on the Li site; we find no evidence for Zn on the Nb site. However, uncertainties result in an upper bound of at most 5% of the Zn dopants being Zn Nb. In addition, the Zn Li defect produces a significant distortion in the lattice out to at least 4Å; the O atoms are attracted toward Zn while the Nb neighbors are repulsed. The Nb EXAFS agree well with the structure from diffraction for the main Nb-X peaks out to about 3.7Å. However, there appears to be a weak third Nb-O peak in the first O shell, which has a low amplitude and a longer bond length. For Nb, the shortest Nb-O bond is extremely stiff (correlated Debye temperature, θ cD ∼ 1100 K), while the longer Nb-O bond is a little weaker (θ cD ∼ 725 K) and of comparable strength to the shortest Zn-O bond (θ cD ∼ 600 K); consequently, substituting Zn at the Li site will stiffen the structure as the Li-O bonds are weak. We discuss implications of a dominant Zn Li defect.

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Section: Introductionmentioning

confidence: 99%

EXAFS evidence for a primary ZnLidopant in LiNbO3

et al. 2012

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“…They suggested the component at 3466 cm −1 corresponding to H + ions located at the Li vacancies (V − Li ) in perfect lattice and the two near 3484 cm −1 to H + ions which occupy V − Li near antisite niobium ions (Nb 4+ Li ) and are largely affected by these intrinsic defects. It is well known for highly (above the optical-damage threshold) Mg-and Zn-doped LN that no OH − absorption bands near 3484 cm −1 can be observed [2,8,9,[17][18][19]. But the case of Hf-doped LN is completely different: the components near 3484 cm −1 still remain there even when the doping level is far beyond the threshold.…”

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confidence: 98%

Investigations of the OH ⁻ absorption bands in congruent and near-stoichiometric LiNbO ₃ :Hf crystals

Yan¹,

Shi²,

Chen³

et al. 2010

EPL

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PACS 61.72.-y -Defects and impurities in crystals; microstructure PACS 77.84.Ek -Niobates and tantalates PACS 78.30.-j -Infrared and Raman spectra Abstract -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 Hf − Nb and H + ions and the subsequent redistribution of H + ions around Hf 3+Li ions in V − Li -deficient lattice. Additionally, the link between the intrinsic defects and how they influence the optical-damage threshold upon adding Hf was discussed in detail.

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Surface modification of single crystal LiTaO3 by H and He implantation

Jin

et al. 2017

Nuclear Instruments and Methods in Physics Research Section B:

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Proton-exchanged OH− absorption spectra of highly Zn-doped LiNbO3 with and without polarization inversion

Cited by 3 publications

References 22 publications

EXAFS evidence for a primary ZnLidopant in LiNbO3

EXAFS evidence for a primary ZnLidopant in LiNbO3

Investigations of the OH ⁻ absorption bands in congruent and near-stoichiometric LiNbO ₃ :Hf crystals

Surface modification of single crystal LiTaO3 by H and He implantation

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Proton-exchanged OH− absorption spectra of highly Zn-doped LiNbO3 with and without polarization inversion

Cited by 3 publications

References 22 publications

EXAFS evidence for a primary ZnLidopant in LiNbO3

EXAFS evidence for a primary ZnLidopant in LiNbO3

Investigations of the OH − absorption bands in congruent and near-stoichiometric LiNbO 3 :Hf crystals

Surface modification of single crystal LiTaO3 by H and He implantation

Contact Info

Product

Resources

About

Investigations of the OH ⁻ absorption bands in congruent and near-stoichiometric LiNbO ₃ :Hf crystals