Zr-substituted Ba_0.6Sr_0.4TiO₃ ferroelectric thin films grown by pulsed laser deposition (PLD) at different laser fluence

ABSTRACT

Zr-substituted Ba_0.6Sr_0.4TiO₃ ((Ba_0.6Sr_0.4)(Ti_0.8 Zr_0.2)O₃) - BSZT) thin films are deposited by using Pulsed Laser Deposition method with different fluence at optimized conditions on amorphous fused silica substrates. The X-ray diffraction (XRD) pattern of the films confirms the formation of cubic phase. Raman studies are performed to understand vibrational modes present in the films. The optical band gap of deposited BSZT thin films were calculated from the transmittance measurements. Microwave dielectric properties of the thin films deposited at 2 J/cm² were measured. These results show BSZT thin films are useful in tunable microwave devices.

KEYWORDS:

• (Ba_0.6Sr_0.4)(Ti_0.8 Zr_0.2)O₃ (BSZT)
• pulsed laser deposition
• laser fluence
• optical properties
• microwave dielectric properties

Acknowledgements

The authors acknowledge the financial support from DST, DRDO and UGC for providing the funding and facilities at CFN and School of Physics, University of Hyderabad. JP acknowledges a fellowship from DST to do this work. SNR acknowledges SRF from DRDO through ACRHEM.