The growth and electrical properties of Pb(Yb1/2Nb 1/2)O3-PbTiO3 (PYbN-PT) epitaxial films were investigated. PYbN-PT epitaxial films with SrRuO3 bottom electrodes were grown by pulsed laser deposition. Optimization of the growth conditions for the PYbNPT epitaxial films was carried out on (100) SrRuO3(100) LaAlO3 substrates using the (50/50) composition target. It was found that formation of pyrochlore phase could be caused not only by low growth temperatures or lead deficiency, but also by poor surface condition of the SrRuO3 bottom electrodes. (001) PYbN-PT epitaxial films with good crystalline quality were obtained for a range of deposition rates (60-100 nm/min) and temperatures (620-680°C) after vacuum annealing the SrRuO 3 bottom electrodes. The ferroelectric and piezoelectric properties of 1 μm-thick PYbN-PT epitaxial films with (50/50) and (60/40) compositions and with (001) and (111) orientations were investigated using (100) LaAlO 3, (100) SrTiO3, and (111) SrTiO3 substrates with SrRuO3 bottom electrodes. The highest remanent polarization (29 μC/cm2) and effective piezoelectric coefficient e31.f (-14 C/m2) were observed in the (001) PYbN-PT (50/50) film. The transition temperature of the (001) PYbN-PT (50/50) film was about 380°C. Because of the degradation of the target during the deposition, a 3 nm-thick film was prepared by three depositions (1 μm each layer). The 3 μm-thick film exhibited a higher e31.f coefficient of -19 C/m2.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Control and Systems Engineering
- Ceramics and Composites
- Condensed Matter Physics
- Electrical and Electronic Engineering
- Materials Chemistry