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order-disorder Transition of Carboxyl Terminated Chains in Polydiacetylenes Vesicles Probed by Second Harmonic Generation and Two-Photon Fluorescence

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Chinese Journal of Chemical Physics 2018年第3期31卷 269-276,367页

作者： Shun-li Chen Xue-feng Zhu Fang-yuan Yang Xue-cong Pan Wei Gan Qun-hui Yuan Laboratory of Environmental Science and Technology Xinjiang Technical Institute of Physics and ChemistryKey Laboratory of Functional Materials and Devices for Special EnvironmentsChinese Academy of SciencesUrumqi 830011China School of Sciences Harbin Institute of Technology(Shenzhen)Shenzhen 518055China School of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China

To understand and control the interfacial properties of polydiacetylenes(PDAs)vesicles withπ-conjugated backbone is very important for their colorimetric sensing of chemical and biological *** this work,we adopted 10,12-pentacosadiynoic acid(PCDA)as the model molecule to prepare PDAs vesicles in aqueous solution with different forms(from monomer to blue-to-purple-to-red phase)by controlling the UV irradiation *** variations of the interfacial conformation of PDAs vesicles during chromatic transitions were inspected by the adsorption behaviors of probe molecules(4-(4-diethylaminostyry)-1-methylpyridinium iodide,D289)on vesicle surface with surface-specific second harmonic generation(SHG)and zeta potential *** SHG signal from D289 adsorbed on vesicle surface attenuated sharply,and the adsorption free energy as well as the corresponding two-photon fluorescence signal decreased slightly in chromatic ***,the change in the surface density of the adsorbed D289 molecules for PDAs vesicles with different forms was relatively small as estimated from zeta potential *** attenuation of the SHG intensity was thus attributed to the overall order-disorder transition and the changed orientation of D289 molecules caused by the gradual distortion of carboxyl head group driven by backbone perturbation.

关键词： Polydiacetylenes vesicle Polymerization interfacial adsorption Second harmonic generation order-disorder transition

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Theoretic Diffraction Research on the order-disorder Effect of Transition Metal in Li(Ni1/3 Co1/3 Mn1/3)O2

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Journal of Harbin Institute of Technology(New Series) 2018年第6期25卷 78-89页

作者： Chunhui Cao Jian Zhang Chuanzheng Yang Baojia Xia Shanghai Institute of Microsystem of Information Technology Shanghai 200050China University of Chinese Academy of Sciences Beijing 100049Chin

After describing research status of super-structure for Li (Ni_(1/3)Co_(1/3)Mn_(1/3)) O_2,diffraction patterns of Li (Ni_(1/3)Co_(1/3)Mn_(1/3)) O_2 in different order parameters have been researched by Powder-cell program,including crystal structure,X-ray and neutron diffraction pattern,anomalous diffraction pattern and comparison of NiCoMn in different positions. The influence of order parameters on intensity of matrix and super-lattice diffraction lines has also been analyzed and the summarization and prospect have been made lastly.

关键词： Li(Ni Co Mn )O order-disorder diffraction

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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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Multilayer transition in a spin-1 Blume Capel model with RKKY interaction and quantum transverse anisotropy

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Chinese Physics B 2011年第1期20卷 609-615页

作者： N.Tahiri H.Ez-Zahraouy A.Benyoussef Computational Physics Group LMPHEDepartement de PhysiqueFaculte des SciencesUniversite Mohammed V-AgdalB.P.1014RabatMorocco

Using mean-field theory, we have studied the effect of quantum transverse anisotropies with RKKY interaction on the multi-layer transition and magnetic properties of the spin-1 Blume-Capel model of a system formed by two magnetic multi-layer materials, of different thicknesses, separated by a non-magnetic spacer of thickness M. It is found that the multilayer magnetic order-disorder transition temperature depends strongly on the value of the transverse anisotropy. The multilayer transition temperature decreases when increasing the transverse anisotropy. Furthermore, there exists a critical quantum transverse anisotropy △xL beyond which the separate transitions occur in the two magnetic layers. The critical transverse anisotropy AxL decreases （increases） on increasing the non-magnetic spacer of thickness M （on increasing the crystal field）, and AxL undergoes oscillations as a function of the Fermi level.

关键词： quantum transverse anisotropy order-disorder lavering transitions. RKKY interaction

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First-principles calculation of phase equilibria and phase separation of the Fe-Ni alloy system

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Rare Metals 2006年第5期25卷 437-440页

作者： Ying Chen Shuichi Iwata Tetsuo Mohri Department of Quantum Engineering and System Science School of Engineering The University of Tokyo Hongo 7-3-1 Bunkyo-ku Tokyo113-8656 Japan Graduate School of Frontier Sciences The University of Tokyo Hongo 7-3-1 Bunkyo-ku Tokyo 113-8656 Japan Division of Materials Science and Engineering Graduate School of Engineering Hokkaido University Kita-13 Nishi-8 Kita-ku Sapporo060-8628 Japan

Theoretical investigation of the phase equilibria of the Fe-Ni alloy has been performed by combining the FLAPW total energy calculations and the Cluster Variation Method through the Cluster Expansion Method. The calculations have proved the stabilization of the LIE phase at 1：3 stoichiometry, which is in agreement with the experimental result, and predicted the existence of L1 0 as a stable phase below 550 K; this L1 0 phase has been missing in the conventional phase diagram. The calculations are extended to the Fe-rich region that is characterized by a wide range phase separation and has drawn considerable attention because of the intriguing Invar property associated with a Fe concentration of 65%. To reveal the origin of the phase separation, a P-V curve in an entire concentration range is derived by the second derivative of free energy functional of the disordered phase with respect to the volume. The calculation confirmed that the phase separation is caused by the breakdown of the mechanical-stability criterion. The newly calculated phase separation line combined with the L1 0 and L12Eorder-disordered phase boundaries provides phase equilibria in the wider concentration range of the system. Furthermore, a coefficient of thermal expansion （CTE） is attempted by incorporating the thermal vibration effect through harmonic approximation of the Debye-Gruneisen model. The Invar behavior has been reproduced, and the origin of this anomalous volume change has been discussed.

关键词： Fe-Ni alloy system order-disorder separation magnetism first-principles calculations cluster variation method cluster expansion method Debye-Gruneisen model

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disordering and reordering of an Al_3Ti-Mn-Nb alloy

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Chinese Science Bulletin 1995年第24期40卷 2081-2084页

作者：车晓舟王谦胡赓祥 Department of Materials Science Shanghai Jiaotong University Shanghai 200030 China

Due to their attractive characteristics such as low density （3,4g/cm3）, relatively high melting point （1613 K）, good high-temperature strength and oxidation resistance, the Al3Tibase alloys have been considered good candidates for high-temperature structural purpose. The stoichiometric Al3Ti intermetallic compound has a tetragonal DO22 crystal structure. By replacing a certain amount of At with Fe, Mn, Cr, or Ni, etc., the DO22 structure

关键词： intermetallic compound Al3Ti-Mn-Nb order-disorder transformation.

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Raman Scattering in Ga_xIn_(1-x)P and (Al_xGa_(1-x) )_0.51 In_0.49 P Alloys

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Semiconductor Photonics and Technology 2002年第3期8卷 129-134页

作者： LU Yi jun 1, GAO Yu lin 1, ZHENG Jian sheng 1, LI Zhi feng 2, CAI Wei ying 2, WANG Xiao guang 2 (1.Dept. of Physics, Xiamen University, Xiamen 361005, CHN 2.Shanghai Institute of Technical Physics, Shanghai 200083, CHN) Dept. of Physics. Xiamen University Xiamen 361005 Shanghai Institute of Technical Physics 上海 200083

Raman scattering spectroscopy is applied to investigate the phonon modes in Ga x In 1- x P ( x =0.52) and (Al x Ga 1- x ) 0.51 In 0.49 P ( x =0.29) alloys. Two mode behavior in Ga x In 1- x P and three mode behavior in (Al x Ga 1- x ) 0.51 In 0.49 P are observed. In ordered Ga x In 1- x P, we clearly distinguish the TO 1(GaP like) mode and the splitting of LO 1(GaP like) and LO 2 (InP like) modes, which is believed to be the result of superlattice effect of ordering, and the LO 1+LO 2 mode, which is observed for the first time. In addition to the b/a ratio, it’s found that the relative intensity of the FLA and the LO 1+LO 2 modes also corresponds to the degree of order. The TO 1 and the splitting of LO 1 and LO 2 devote together to the reduction of the "valley depth". In (Al x Ga 1- x ) 0.51 In 0.49 P, the doubling of FLA is observed. Due to the influence of Al composition, the GaP like LO mode becomes a shoulder of the InP like LO mode. The unresolved Raman spectra indicate the existence of ordered structure in (Al x Ga 1- x ) 0.51 In 0.49 P alloys.

关键词： Semiconductors order-disorder effects Phonons Luminescence

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MIXED FERROELECTRIC PHASE TRANSITIONS IN CRYSTALS LITHIUM TANTALATE AND LITHIUM NIOBATE

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Progress in Natural Science:Materials International 1991年第6期 497-504页

作者：张明生 Center for Materials Analysis and State Laboratory of Solid State Microstractures Nanjing University Nanjing 210008 PRC

Ⅰ.INTRODUCTIONLithium tantalate LiTaO3and lithium niobate LiNbO3are ferroelectric materials ofABO3structure with oxygen *** ferroelectric properties are similar to those ofthe perovskites,although neither of them belongs to perovskite *** Curie point inLiNbO3is at 1480 K and in LiTaO3is sample-dependent,a temperature range of 50 K from880 to 930 K in LiTaO3is measured by the measurements of pyroeloctric effects,refractiveindexes and dielectric *** a sample dependence of the transition is foundto be related to the growth conditions,internal components and internal stress in the crys-tals.

关键词： lithium tantalate lithium niobate mixed phase transition displacive order-disorder

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A narrow bandgap two dimensional hybrid organic-inorganic perovskite with anomalous structural phase transition

A narrow bandgap two dimensional hybrid organic-inorganic pe...

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中国化学会2019年中西部地区无机化学化工学术研讨会

作者： Chao Li Linsui Li Wenjuan Wei Yunzhi Tang Engineering research institute Jiangxi University of Science and Technology

Two dimensional (2D) organic-inorganic hybrid perovskites have attracted significant attention due to their unique layered structure,and potential optical ***,we research a novel 2D organic-inorganic hybrid perovskite[CHNS]PbI (1)(CHNS=2-Thiophenemethylamine) with a reversible phase transition at *** crystal structure analysis indicates that organic CHNScations show an anomalous variation from high-fold to low-fold disorder between low and high temperature,which makes space group change from Cmca to *** addition,solid ultraviolet measurement indicates 1 has a narrow band gap of 1.80 eV and strong fluorescence at *** results indicate that 1 has potential applications in the field of solar cells and optoelectronic devices.

关键词： 2D organic-inorganic hybrid perovskites order-disorder Fluorescence Band gap

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