High Curie temperature BiInO₃-PbTiO₃ films

Area of Science:

• Materials Science
• Solid State Physics
• Ceramic Engineering

Background:

• Piezoelectric materials are essential for various electronic devices.
• Lead titanate (PbTiO3) based ceramics are widely studied for their piezoelectric properties.
• Improving the Curie temperature and piezoelectric coefficients of thin films is a key research objective.

Purpose of the Study:

• To investigate the effect of BiInO3 doping on the properties of PbTiO3 piezoelectric thin films.
• To determine the optimal composition for enhanced dielectric and piezoelectric performance.
• To analyze the relationship between composition, tetragonality, and dielectric nonlinearity.

Main Methods:

• Pulsed laser deposition was used to prepare xBiInO3-(1-x)PbTiO3 thin films.
• Compositional variations (x = 0.10, 0.15, 0.20, 0.25) were systematically studied.
• Dielectric properties, piezoelectric coefficients, Curie temperature, and tetragonality were characterized.
• Rayleigh analysis was employed to study extrinsic contributions to dielectric nonlinearity.

Main Results:

• Tetragonality of the films decreased with increasing BiInO3 content.
• The highest dielectric constant (665) and transverse piezoelectric coefficient (-13.6 C/m^2) were observed at x = 0.20.
• The composition with x = 0.20 showed the largest extrinsic contributions to dielectric nonlinearity.
• Curie temperature increased with BiInO3 content, ranging from 558°C to 633°C.

Conclusions:

• The addition of BiInO3 to PbTiO3 is effective in enhancing piezoelectric properties and increasing the Curie temperature.
• The optimal composition of x = 0.20 in xBiInO3-(1-x)PbTiO3 offers superior dielectric and piezoelectric performance.
• These findings suggest potential for developing advanced lead-free piezoelectric devices.