Abstract
Highly (001)-oriented 1mol% Mg doped (Ba0.67,Sr0.33)TiO3 (BST) films with a thickness of 1.25μm were grown on (110) SrRuO3/(001) SrTiO3 substrates by pulsed laser deposition. X-ray diffraction measurements reveal that the BST thick films have very high crystalline quality, and have a distorted lattice with a large tetragonality a/c=1.012. The BST thick films have a remanent polarization (Pr) value as large as 10.1μC/cm2 and a coercive electric field (Ec) value of 65.0kV/cm. The films possess dielectric constant and loss values of εr=385.36 and tgδ=0.038 at 1kHz and room temperature. The leakage currents of the films are on the order of 10−5A/cm2 at ±150kV/cm. The mechanism for enhancing electric properties of the Mg doped BST films was also discussed.
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