Abstract
Polar-axis oriented CaBi4Ti4O15(CBTi144) films were fabricated on Pt foils using a complex metal alkoxide solution. The oxygen ambient during crystallization of the films impacted the crystal perfection, crystallite size, and the ferroelectric properties. The 500mm thick film crystallized in oxygen flow had single columnar structure and in-plane grain size of about 200nm. The Scherrer’s crystallite diameter was calculated as about 110nm. The ferroelectric properties were improved. The Pr and Ec of the film enhanced as 33.6μC∕cm2 and 357kV∕cm, respectively, at an applied voltage of 50V. Voltage applied for full polarization switching was lowered by controlling oxygen stoichiometry of the film. Indeed, the polar-axis-oriented CBTi144 films would open up possibilities for devices as Pb-free ferroelectric materials.
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