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- Title
Optical and electrical properties of BaSrTiO nanopowders at different Sr ion content.
- Authors
Rashad, M.; Turky, A.; Kandil, A.
- Abstract
Barium strontium titanate (BST) BaSrTiO nanopowders have been successfully synthesized using oxalate precursor route. The effect of Sr ion content from 0.3 to 0.7 on the crystal structure, crystallite size, microstructure, electrical and optical properties was systematically studied. The results revealed that well crystalline single BST phase was formed by annealing the oxalate precursor at 1,000 °C for 2 h. The crystallite size of the BST powders was decreased with increasing the Sr ion molar ratios. The crystallite size was decreased from 56.0 to 33.1 nm when the Sr ion content increased from 0.3 to 0.7. Additionally, the lattice parameter ( a), unit cell volume and X-ray density of BST ware decreased whereas the porosity, % were increased with Sr ion concentration. The BST phase appeared as cubic-like structure. The spectrophotometer measurement results demonstrated that the room temperature band gap energy varied with the Sr ion composition x. The band gap energy was shifted to low energy and it was decreased from 3.6 to 3.2 eV with increasing the Sr ion content from 0.3 to 0.7. Moreover, the DC resistivity was enhanced with increasing the Sr ion ratio. The dielectric response obtained for the stressed samples corresponds to a true resonance rather than a dispersion process with a characteristic frequency around 1 GHz at room temperature. However, the peaks commonly observed at GHz frequency were changed with varying the Sr ion composition. The high imaginary components of dielectric permittivity for x = 0.3 was found at higher frequency region around 1.6 GHz compared with the samples with x values of 0.5 and 0.7 in which the frequency regions were around 1.25 and 1.15 GHz, respectively.
- Subjects
ELECTRIC properties of barium strontium titanate; OPTICAL properties of barium compounds; ELECTRIC properties of metals; METAL nanoparticles; STRONTIUM ions; NANOPARTICLE synthesis; CRYSTAL structure; METAL microstructure
- Publication
Journal of Materials Science: Materials in Electronics, 2013, Vol 24, Issue 9, p3284
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-013-1244-9