钙钛矿铁电体在超高压下的铁电重现

doi:10.11896/cldb.18010283

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Abstract Ferroelectric materialis defined as a kind of material whose crystal show spontaneous polarization in a certain temperature range and its spontaneous polarization direction can be reversed by the direction reverse of an external electric field. Ferroelectric material features ferroelectric, pyroelectric, piezoelectric, dielectric, photoelectric, acoustooptic, photorefractive and nonlinear optical effects, which enable its important applications in ferroelectric memory, infrared detector, spatial light modulator, dielectric thermal radiation measuring device, optical sensor and so forth. Accordingly, Ferroelectric materials and their applications have become one of the popular research topics in condensed matter physics and solid-state electronics.
It is universally known that perovskite structure materials account for a considerable proportion among piezoelectric, superconductivity, magnetoresistance, catalysis, ionic conductor and other functional materials. As a result, perovskite structure materials have aroused great research interests in the field of materials science. Concerning the ferroelectric materials, perovskite ferroelectric materials are also the most widely used in electronic ceramics.
Similar to temperature, pressure is also one of the basic thermodynamic factors that determine the existence of a material and change the structure and properties of the material. When pressure is added to the materials, complex interaction between atoms in the material occurs, which presents quite different properties from the one under atmospheric pressure. In this case, the relative theory of materials obtained at atmospheric pressure may not be able to explain the phenomenon of materials under high pressure. People have long been trying to explore the behavior of matters under high pressure and reveal the physical phenomena and laws. Also, the effect of ultra-high pressure on the structure and properties of ferroelectric materials has always been the focus of research. The study of ferroelectric materials under high pressure by means of X-ray diffraction, Raman spectrum, neutron scattering and first-principle theoretical calculation show that pressure contribute to increase the symmetry of ferroelectric materials, reduce the degrees of freedom of space group, make the crystal structure become more regular, and decrease spontaneous polarization, resulting in the reduction of ferroelectric properties. In addition, the crystal structure of ferroelectric material transforms from ferroelectric phase to paraelectric one, and the ferroelectric material finally turns to paraelectric one.
In recent years, a novel phenomenon appears in ferroelectric materials under ultra-high pressure has been found during the research on ferroelectric materials under a much higher pressure. To be specific, the ferroelectric properties gradually decrease with the increasing pressure, yet there will be a sharp rise in ferroelectric properties of ferroelectric materials when the pressure exceeds a certain critical value, and ferroelectric properties have reappeared. In this paper, the changes of the crystal structure and ferroelectricity reentrance of perovskite-type ferroelectrics (such as BaTiO₃, PbTiO₃, KNbO₃), composite ferroelectrics (BiFeO₃-PbTiO₃), relaxor ferroelectrics (Pb(Zn_1/3Nb_2/3)O₃) and Pb(mg_1/3-Nb_2/3)O₃, BaTiO₃/PbTiO₃ superlattices, under ultra-high pressure are reviewed. It is expected to provide a reference for the study on ferroelectric mechanism of ferroelectric materials, and offer a comprehensive understanding of the changes in the structure and properties of ferroelectric materials as a function of pressure. The theoretical basis and new approaches will be provided for the preparation and research of new perovskite-type ferroelectrics in the future.

Key words： perovskite-type ferroelectric materials ultra-high pressure phase transition reentrance of ferroelectricity composite ferroelectrics relaxor ferroelectrics

Published: 10 April 2019

CLC number:

O452

Fund:This work was financially supported by the natural science project of zhengzhou science and technology bureau (2015CB932200)

About author:: Changjiang Xiao received his B.E. degree in chemistry from Zhengzhou University in 1994 and received his Ph.D. degree in Condensed matter Physics from the Institute of Physics, Chinese Academy of Sciences, in 2007. His research interests are functional materials and synthetizing new materials under high pressure.

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Cite this article:

XIAO Changjiang. Ferroelectricity Reentrance of Perovskite Ferroelectric Under Ultra-high Pressure: an Overview[J]. Materials Reports, 2019, 33(7): 1163-1168.

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http://www.mater-rep.com/EN/10.11896/cldb.18010283 OR http://www.mater-rep.com/EN/Y2019/V33/I7/1163

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