title: Large electrostrain and high optical temperature sensitivity in BaTiO3-(Na0.5Ho0.5)TiO3 multifunctional ferroelectric ceramics.
abstract: Ferroelectric (1 -x)BaTiO3-x(Na0.5Ho0.5)TiO3 ceramics with ferroelectric and up-conversion luminescent multifunctions were designed and fabricated by a solid state reaction process. Their structure, ferroelectric, piezoelectric, up-conversion photoluminescence and relative optical temperature sensing properties were investigated systematically. Crystal structure analysis and Rietveld refinements based on the powder X-ray diffraction data show that the ceramics crystallized in the tetragonal perovskite space group P4mm at room temperature. Enhanced electrical properties and strong green up-conversion luminescence with thermally coupled green emission bands centered at 523 and 553 nm were observed. For a typical sample x equals 0.05, a large electrostrain of 0.279% was obtained under a 70 kV cm(-1) electric field that is comparable to that of the PZT4. Meanwhile, the excellent optical temperature sensitivity (0.0063 K(-1) at 480 K) is higher than that of Er-doped BaTiO3 nanocrystal materials. The results suggest that the BaTiO3-(Na0.5Ho0.5)TiO3 material should be an attractive material for piezoelectric actuator and temperature sensing device applications.
authors.affiliation: Key Laboratory of Advanced Civil Engineering Materials of the Ministry of Education, Functional Materials Research Laboratory, School of Materials Science and Engineering, Tongji University, 4800 Cao'an Road, Shanghai 201804, China. xs-wang@tongji.edu.cn.
authors.forename: Jun
authors.initials: J
authors.lastname: Li
authors.forename: Xiaona
authors.initials: X
authors.lastname: Chai
authors.forename: Xusheng
authors.initials: X
authors.lastname: Wang
authors.forename: Chao-Nan
authors.initials: CN
authors.lastname: Xu
authors.forename: Yihao
authors.initials: Y
authors.lastname: Gu
authors.forename: Haifeng
authors.initials: H
authors.lastname: Zhao
authors.forename: Xi
authors.initials: X
authors.lastname: Yao