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Temperature-dependent Raman spectroscopic study of ferroelastic K_2Sr(MoO_4)

Chinese Physics B 2018年第11期27卷 591-595页

作者： Ji Zhang De-Ming Zhang Ran-Ran Zhang An Hui Xin Hua University Hefei 230088 China Anhui Institute of Optics and Fine Mechanics Chinese Academy of Sciences Hefei 230031 China High Magnetic Field Laboratory of the Chinese Academy of Sciences Hefei 230031 China

Raman scattering measurements of K_2 Sr（MoO_4）2 were performed in the temperature range of 25–750？C. The Raman spectrum of the low-temperature phase α-K_2 Sr（MoO_4）2 that was obtained by first-principle calculations indicated that the Raman bands in the wavenumber region of 250–500 cm-1 are related to Mo–O bending vibrations in MoO4 tetrahedra,while the Raman bands in the wavenumber region of 650–950 cm-1 are attributed to stretching vibrations of Mo–O *** temperature-dependent Raman spectra reveal that K_2 Sr（MoO_4）2 exhibits two sets of modifications in the Raman spectra at ～ 150？C and ～ 475？C, attributed to structural phase transitions. The large change of the Raman spectra in the temperature range of 150？C to 475？C suggests structural instability of the medium-temperature phase β-K_2 Sr（MoO_4）2.

关键词： ferroelastics K2Sr(MoO4)2 crystal Raman spectroscopy phase transition

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Hybrid Optical-Electrical Perovskite Can Be a Ferroelastic Semiconductor

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CCS Chemistry 2022年第6期4卷 2009-2019页

作者： Changyuan Su Mengmeng Lun Yidan Chen Yichen Zhou Zhixu Zhang Ming Chen Peizhi Huang Dawei Fu Yi Zhang Ordered Matter Science Research Center Jiangsu Key Laboratory for Science and Applications of Molecular FerroelectricsSoutheast UniversityNanjing 211189 Institute for Science and Applications of Molecular Ferroelectrics Key Laboratory of the Ministry of Education for Advanced Catalysis MaterialsZhejiang Normal UniversityJinhua 321004

Organic–inorganic hybrid perovskites(OIHPs)have been a hot research topic due to their advanced structural and functional features that cover almost all the research fields of intelligent materials including ferroelectric,photovoltaic,fluorescent,and ***,the development of the construction of an OIHP ferroelastic semiconductor with optical-electrical response has been a huge challenge and infrequently *** this work,a rare and interesting hybrid perovskite ferroelastic semiconductor,[BFDA]PbBr_(3)(BFDA=benzyl-(2-fluoro-ethyl)-dimethyl-ammonium),was synthesized,which benefits from the structural advantage of a long tail BFDA to be balanced by the suitable inorganic framework.[BFDA]PbBr_(3) shows a high-temperature ferroelastic phase transition at 365 K and a direct band gap of 3.33 *** addition,it can emit charming orange-pink light under a 365 nm UV *** combine this with the ferroelastic,optical,and dielectric properties,[BFDA]PbBr_(3) can be identified as a very rarely reported ferroelastic *** above-mentioned synthesis strategy is also helpful for the enrichment and development of the hybrid perovskite family.

关键词： hybrid perovskite ferroelastics phase transition photoluminescent semiconductor multifunctional materials

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Models of inhomogeneous polarization of ferroelectrics and their practical application

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Journal of Advanced Dielectrics 2020年第1期10卷 100-107页

作者： Alexander Skaliukh Institute Mathematics Mechanics and Computer Sciences Named After Vorovich I.I.of Southern Federal University Milchakova Str.8A Rostov on DonRussia

A three-dimensional mathematical model is proposed that describes the ferroelectric response of polycrystalline ferroelectrics to an electric field in the absence of mechanical *** is based on the separation of the switching process into two related parts:the rotation of the spontaneous polarization vectors and the destruction of the domain wall fixing *** each of the parts,the energy costs are calculated,which are the components of the energy balance in the real polarization *** constitutive relations for the induced and residual components of the polarization vector of the representative volume are obtained.A number of numerical experiments were performed,which showed good agreement with the experimental data.

关键词： Ferroelectrics ferroelastics polarization strain constitutive relations

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NH_(+)^(4)/K^(+)-substitution-induced C–F–K coordination bonds for designing the highest-temperature hybrid halide double perovskite ferroelastic

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Chinese Chemical Letters 2023年第7期34卷 364-367页

作者： Chang-Feng Wang Na Wang Chao Shi Heng-Yun Ye Yi Zhang Le-Ping Miao Chaotic Matter Science Research Center Department of MaterialsMetallurgy and Chemistry.Jiangxi University of Science and TechnologyGanzhou 341000.China

Ferroelastic materials with switchable spontaneous strain possess widely potential applications in the field of energy and information ***,organic-inorganic hybrid halide double perovskites (OIHHDPs) have become a charming new platform for developing various functional materials,such as ferroelectrics,fluorescence and X–ray ***,OIHHDP ferroelastic materials,especially high-temperature ones,are ***,we initially synthesized an OIHHDP ferroelastic,(2,2-difluoroethanamine)_(2)[(NH_(4))InCl_6](1),which possesses a ferroelastic phase transition at 407 ***,thanks to the flexible B-site for OIHHDPs,we replaced the NH_(4)^(+) ions within[(NH_(4))InCl_6]_n^(2n–)formworks with K^(+)ions,which endows with coordination bonds between 2,2-difluoroethanamine organic cations and[KInCl_6]_n^(2n–)*** to the existence of coordination bonds,the phase transition temperature of (2,2-difluoroethanamine)_(2)[KInCl_6](2) can reach 458 *** far as we know,this value is the highest reported in OIHHDP *** work offers inspiration for the design of high-temperature OIHHDP phase transition materials including ferroelectrics and ferroelastics.

关键词： Lead-free Hybrid halide double perovskites ferroelastics Phase transition Order-disorder

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