1-x Sr x TiO 3 Nanoceramics

Journal of Physics: Conference Series

article

Devendra Singh¹  Anju Dixit¹  Pramod S Dobal² 

[1] Department of Physics, School of Basic Sciences UIET, CSJM University;Department of Physics, VSSD College

关键词: XRD;    Ferroelectrics;    SEM;    Dielectrics;    Sol-gel;   

DOI  :  10.1088/1757-899X/1272/1/012026

学科分类：物理（综合）

来源: Institute of Physics Publishing Ltd.

【 摘 要 】

Ba 1-x Sr x TiO 3 (0.0 ≤ x ≤ 0.5) nanoceramics were synthesized via sol-gel route and the structural and electric properties of the resulting compositions were investigated. revealed A tetragonal crystal structures for x = 0.0 - 0.3 and a cubic structure for x = 0.5 compositions was revealed by X-ray diffraction. The smaller ionic radii of Sr ions resulted in the lowering of c/a ratio with increasing x and a tetragonal to cubic structural transformation was observed at around x = 0.4. The average crystallite size gradually decreased with increasing x from 0 to 0.5. This trend was visible in electron micrographs. The room temperature dielectric constant in these nanoceramics increases with increasing Sr and a maximum value of 1553 was observed for x =0.3. Curie temperature ( T c ) of 125 °C was obtained for x =0.0, which shifted toward lower temperature with increasing x value. The value of T c was observed as 100 and 75 °C for x = 0.1 and 0.3, respectively. The remnant polarization ( P r ), saturation polarization ( P s ), and coercive field ( E c ) decreased with increasing Sr concentration in BT due to the structural modifications. Value of P r decreases from 0.637 to 0.229 μC/cm 2 , P s decreases from 8.910 to 3.238 μC/cm 2 and E c decreases from 0.631 to 0.255 kV/cm with increasing x from 0 to 0.5.

【 授权许可】

Unknown