Abstract
A paste was developed using commercially available BaTiO3 nanoparticles and subsequently used to fabricate 5 cm × 5 cm freestanding films via a simple screen-printing method. The dielectric properties of the resultant freestanding films were investigated using sintering temperature as a parameter. The results showed that the desired bulk behavior could not be attained in films sintered at 900 °C. When the sintering temperature was increased to 1000 °C and 1100 °C, the films exhibited bulk and single-crystal-like behaviors; sintering at 1200 °C resulted in a film with dielectric properties superior to those of bulk and single-crystalline BaTiO3. In addition, the dielectric loss was less than 0.04 in the temperature range from room temperature to 160 °C, indicating that the film is a highly practical freestanding film. The newly developed technology for forming freestanding films with thicknesses ranging from tens to hundreds of micrometers can be used to develop not only materials for multilayered ceramic capacitors but also materials for piezoelectric transducers, actuators, positive-temperature-coefficient thermistors, and ultrasonic devices.
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