TY - JOUR
T1 - Influence of Sm2O3 doping on formation and structure of SrBi2Nb2O9 nanocrystals in lithium borate glasses
AU - Venkataraman, B. Harihara
AU - Fujiwara, T.
AU - Varma, K. B.R.
AU - Komatsu, T.
PY - 2009/9/15
Y1 - 2009/9/15
N2 - New glasses of 16.66SrO-16.66[(1 - x)Bi2O3-xSm2O3]-16.66Nb2O5-50Li2B4O7 (0 ≤ x ≤ 0.5, in molar ratio), i.e., the pseudo-binary Sm2O3-doped SrBi2Nb2O9-Li2B4O7 glass system, giving the crystallization of Sm3+-doped SrBi2Nb2O9 nanocrystals are developed. It is found that the thermal stability of the glasses against the crystallization and the optical band gap energy increases with increasing Sm2O3 content. The formation of fluorite-type Sm3+-doped SrBi2Nb2O9 nanocrystals (diameters: 13-37 nm) with a cubic structure is confirmed in the crystallized (530 °C, 3 h) samples from X-ray powder diffraction analyses, Raman scattering spectrum measurements, and transmission electron microscope observations. The effect of Sm3+-doping on the microstructure, Raman scattering peak positions, and dielectric properties of composites comprising of fluorite-type SrBi2Nb2O9 nanocrystals and the Li2B4O7 glassy phase is clarified. It is found that fluorite-type SrBi2Nb2O9 nanocrystals transform to stable perovskite-type SrBi2Nb2O9 crystals with an orthorhombic structure by heat treatments at around 630 °C.
AB - New glasses of 16.66SrO-16.66[(1 - x)Bi2O3-xSm2O3]-16.66Nb2O5-50Li2B4O7 (0 ≤ x ≤ 0.5, in molar ratio), i.e., the pseudo-binary Sm2O3-doped SrBi2Nb2O9-Li2B4O7 glass system, giving the crystallization of Sm3+-doped SrBi2Nb2O9 nanocrystals are developed. It is found that the thermal stability of the glasses against the crystallization and the optical band gap energy increases with increasing Sm2O3 content. The formation of fluorite-type Sm3+-doped SrBi2Nb2O9 nanocrystals (diameters: 13-37 nm) with a cubic structure is confirmed in the crystallized (530 °C, 3 h) samples from X-ray powder diffraction analyses, Raman scattering spectrum measurements, and transmission electron microscope observations. The effect of Sm3+-doping on the microstructure, Raman scattering peak positions, and dielectric properties of composites comprising of fluorite-type SrBi2Nb2O9 nanocrystals and the Li2B4O7 glassy phase is clarified. It is found that fluorite-type SrBi2Nb2O9 nanocrystals transform to stable perovskite-type SrBi2Nb2O9 crystals with an orthorhombic structure by heat treatments at around 630 °C.
KW - Dielectric properties
KW - Lithium borate
KW - Nano-composites
KW - Samarium doping
KW - Strontium bismuth niobate
KW - Transmission electron microscopy
KW - X-ray diffraction
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U2 - 10.1016/j.matchemphys.2009.05.055
DO - 10.1016/j.matchemphys.2009.05.055
M3 - Article
AN - SCOPUS:67650084385
SN - 0254-0584
VL - 117
SP - 244
EP - 249
JO - Materials Chemistry and Physics
JF - Materials Chemistry and Physics
IS - 1
ER -