2011/02/22 by Desheng Fu, Fu, Desheng, Kouhei Fukamachi +11
Engineering · Materials Science · Physics and Astronomy · #Acoustic Wave Resonator Technologies #FOS: Physical sciences #Ferroelectric and Piezoelectric Materials #Materials Science (cond-mat.mtrl-sci) #Other Condensed Matter (cond-mat.other) #Photorefractive and Nonlinear Optics
paper · pdf · doi:10.48550/arxiv.1102.4473
openalex publication_date 2011/02/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We report that an energetic plasma process is extremely effective in enlarging the unit cell volume and ferroelectric distortion of the ferroelectric oxides, resulting in a significant increase in its Tc. We demonstrate experimentally that c-axis oriented BaTiO3 films can be deposited directly on quartz glass and Si substrates using such a process and that the material shows an approximately 5% expansion of its unit cell volume and approximately 4 times the ferroelectric tetragonal distortion of the bulk crystals. Such a frozen negative pressure results in a Tc value that is approximately 580 K higher than that of bulk single crystals, providing a wide range of operating temperatures for the devices. The present results suggest an approach to producing ferroelectric oxides with unique properties that might be extended to ferromagnetic or superconductor oxides and demonstrate a route to a lead-free ferroelectric oxide for capacitive, ferroelectric memory, and electro-optical devices.