PMN-PT, rare earth doping, dielectric, ferroelectric, photoluminescence
Rare earth (RE = La3+, Sm3+, Pr3+) ion doped Pb(Mg1/3Nb2/3)O3-PbTiO3 (RE-PMN-PT) ferroelectric thin films with compositions near the morphotropic phase boundary were grown on the Pt/TiO2/SiO2/Si(100) substrate using sol-gel/spin coating method. The phase structure, electrical properties, and photoluminescence performance of thin films were investigated systematically. The highly (100)-preferred orientation was obtained in pure perovskite Sm-PMN-0.30PT thin films with an average grain size of 131 nm. After 2.5% Sm3+ doping, the PMN-0.30PT thin films exhibited a triple enhancement of dielectric permittivity with a maximum value of 3500 at 1 kHz, a low dielectric loss of 1.3%, and high remanent polarization of 17.5 μC/cm2 at room temperature. In visible light and near-infrared band, the transmittance rate increased with PT content and showed the highest value of 85% in 2.5%Sm-PMN-0.31PT. In addition, the films presented strong red-orange emission at 599 nm, which was sensitively in temperature range of 248-273 K corresponding to the rhombohedral to monoclinic phase transition temperature.
Tsinghua University Press
Shun ZHOU, Dabin LIN, Yongming SU, Lin ZHANG, Weiguo LIU. Enhanced dielectric, ferroelectric, and optical properties in rare earth elements doped PMN-PT thin films. Journal of Advanced Ceramics 2021, 10(1): 98-107.