Sintering Temperature Driven Structural, Dielectric, Ferroelectric, and Piezoelectric Properties of 0.5Ba(Zr 0.2 Ti 0.8 )O 3 -0.5(Ba 0.7 Ca 0.3 )TiO 3 Lead-Free Composites

• Published in: ECS transactions 2022-04, Vol.107 (1), p.9339-9349
• Main Authors: Sharma, Sarita, Shah, Jyoti, Kotnala, Ravinser Kumar, Negi, Nainjeet Singh
• Format: Article
• Language: English
• ISSN: 1938-5862; 1938-6737
• DOI: 10.1149/10701.9339ecst

Lead-free 0.5Ba(Zr 0.2 Ti 0.8 )O 3 -0.5(Ba 0.7 Ca 0.3 )TiO 3 composites have been synthesized via sol-gel chemical route. We have systematically investigated the influence of sintering temperature on the structural and electrical properties of the BZT-BCT composites. The 0.5Ba(Zr 0.2 Ti 0.8 )O 3 -0.5(Ba 0.7 Ca 0.3 )TiO 3 composites were prepared by combining Ba(Zr 0.2 Ti 0.8 )O 3 (BZT) and (Ba 0.7 Ca 0.3 )TiO 3 (BCT) powders and sintered at different temperatures 900-1400 0 C. The electrical properties of BZT-BCT composites improve with increasing sintering temperature. The composites sintered at 1300 and 1400 0 C exhibit enhanced ferroelectric properties with spontaneous polarization P s ~ 11.2 μC/cm 2 and 8.66 μC/cm 2 respectively. The dielectric and piezoelectric properties of BZT-BCT composites also improve with increasing sintering temperature. The dielectric constant value ε ʹ ~ 2938, tan δ ~ 0.016 and piezoelectric co-efficient d 33 ~ 278 pC/N were measured for BZT-BCT composite sintered at 1400 0 C while observing a considerably high transition temperature of T c ~ 120 0 C. The observed results are discussed in terms of structural and microstructural analysis as a function of sintering temperature.