Fabrication of Epitaxial Thin Films by Pulsed Laser Deposition and Structural Studies of (Ba0.85Ca0.15)(Zr0.10Ti0.90)O3: a Lead Free Piezoelectric

Upadhyaya, M (2015) Fabrication of Epitaxial Thin Films by Pulsed Laser Deposition and Structural Studies of (Ba0.85Ca0.15)(Zr0.10Ti0.90)O3: a Lead Free Piezoelectric. Masters thesis, Indian Institute of Technology Hyderabad.

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Abstract

After the discovery of piezoelectricity in 1880 by Curie brothers, the drive for basic science behind the phenomenon and utilization for new applications begun. Later the discovery of PZT (Lead Zirconate Titanate) led to saturation in further discoveries because of its superior piezoelectric properties. But the presence of lead in PZT is known to be hazardous to the environment. Hence, the need for lead free piezoelectric materials arose. In 2009 Wenfeng Liu reported high dielectric constant value in lead free piezoelectric materials Ba0.85Ca0.15Zr0.10Ti0.90O3 (BCZT). The basic approach to achieving high piezoelectricity is to place the composition of the material to the proximity of a composition- induced phase transition between two ferroelectric phases. Easy domain switching with low energy barrier was the reason for high piezoelectric constants values in BCZT. Later BCZT has been extensively studied in bulk but the field of BCZT thin films still needs to be studied for both fundamental aspects and applications.

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