TY - JOUR
T1 - A defect structure model of LiNbO3:Sc2O3
AU - Shimamura, S.
AU - Watanabe, Y.
AU - Sota, T.
AU - Suzuki, K.
AU - Iyi, N.
AU - Yajima, Y.
AU - Kitamura, K.
AU - Yamazaki, T.
AU - Sugimoto, A.
AU - Yamagishi, K.
PY - 1996/9/9
Y1 - 1996/9/9
N2 - We have systematically studied the behaviour of the absorption bands due to the O-H bond-stretching vibration and its polarization characteristics in LiNbO3:Sc2O3 with the use of well characterized crystals. It has been found that the O-H bond-stretching vibrational frequencies, ν(OH), have a strong correlation with Nb concentration in the crystals as in the case of MgO-doped LiNbO3. The values of ν(OH) shift to the higher-frequency region when the Sc concentration in the crystal exceeds about 23 mol%. The magnitude of the frequency shift is smaller and the polarization dependence of the absorption bands due to ν(OH) is weaker in Sc2O3-doped LiNbO3 than in MgO-doped LiNbO3. These features are attributed to the difference of the charge between Sc3+ and Mg2+. We have also proposed an ideal defect structure model for Sc2O3-doped LiNbO3, which is based on the Li-site vacancy model as an intrinsic defect structure model. The observed behaviour of ν(OH) is consistently explained by the proposed defect structure model. This supports the justification of the extrinsic defect structure model based on the Li-site vacancy model for Sc2O3-doned LiNbO3 as well as for MgO-doped LiNbO3.
AB - We have systematically studied the behaviour of the absorption bands due to the O-H bond-stretching vibration and its polarization characteristics in LiNbO3:Sc2O3 with the use of well characterized crystals. It has been found that the O-H bond-stretching vibrational frequencies, ν(OH), have a strong correlation with Nb concentration in the crystals as in the case of MgO-doped LiNbO3. The values of ν(OH) shift to the higher-frequency region when the Sc concentration in the crystal exceeds about 23 mol%. The magnitude of the frequency shift is smaller and the polarization dependence of the absorption bands due to ν(OH) is weaker in Sc2O3-doped LiNbO3 than in MgO-doped LiNbO3. These features are attributed to the difference of the charge between Sc3+ and Mg2+. We have also proposed an ideal defect structure model for Sc2O3-doped LiNbO3, which is based on the Li-site vacancy model as an intrinsic defect structure model. The observed behaviour of ν(OH) is consistently explained by the proposed defect structure model. This supports the justification of the extrinsic defect structure model based on the Li-site vacancy model for Sc2O3-doned LiNbO3 as well as for MgO-doped LiNbO3.
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U2 - 10.1088/0953-8984/8/37/005
DO - 10.1088/0953-8984/8/37/005
M3 - Article
AN - SCOPUS:0004986382
SN - 0953-8984
VL - 8
SP - 6825
EP - 6832
JO - Journal of Physics Condensed Matter
JF - Journal of Physics Condensed Matter
IS - 37
ER -