title: Super Stable Ferroelectrics with High Curie Point.
abstract: Ferroelectric materials are of great importance in the sensing technology due to the piezoelectric properties. Thermal depoling behavior of ferroelectrics determines the upper temperature limit of their application. So far, there is no piezoelectric material working above 800 °C available. Here, we show Nd2Ti2O7 with a perovskite-like layered structure has good resistance to thermal depoling up to 1400 °C. Its stable behavior is because the material has only 180° ferroelectric domains, complex structure change at Curie point (Tc) and their sintering temperature is below their Tc, which avoided the internal stresses produced by the unit cell volume change at Tc. The phase transition at Tc shows a first order behavior which involving the tilting and rotation of the octahedron. The Curie - Weiss temperature is calculated, which might explain why the thermal depoling starts at about 1400 °C.
authors.affiliation: National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, China.|Southwest University of Science and Technology, Mianyang 621010, China.
authors.forename: Zhipeng
authors.initials: Z
authors.lastname: Gao
authors.affiliation: National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, China.
authors.forename: Chengjia
authors.initials: C
authors.lastname: Lu
authors.affiliation: National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, China.
authors.forename: Yuhang
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Liansu Ltd., 777 Hongqi road, Jiamusi 154002, China.
authors.forename: Sinuo
authors.initials: S
authors.lastname: Yang
authors.affiliation: National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, China.
authors.forename: Yuying
authors.initials: Y
authors.lastname: Yu
authors.affiliation: National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, China.
authors.forename: Hongliang
authors.initials: H
authors.lastname: He