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Powder Quartz/Nano-TiO2 composite: Mechanochemical Preparation and Photocatalytic Degradation of Formaldehyde

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Journal of Wuhan University of Technology(materials Science) 2018年第6期33卷 1381-1386页

作者： WANG Binbin DENG Yuequan HE Ping state key laboratory cultivation base for nonmetal composites and functional materials Mianyang 621010China School of materials Science and Engineering Southwest University of Science and TechnologyMianyang 621010China key laboratory of Solid Waste Treatment and Resource Recycle of Ministry of Education Southwest University of Science and TechnologyMianyang 621010China

Powder quartz(PQ)/nano-TiO2composite was prepared by a mechanochemical method. based on as-prepared PQ/nano-TiO2composite, we prepared interior paints and investigated the degradation efficiency of formaldehyde(DEF). Scanning electron microscopy showed that nano-TiO2got well dispersed by the adding of PQ. Thermogravimetric analysis indicated that the mass ratio of 4:1 was a relatively good proportion for the most production of PQ/nano-TiO2composite. Fourier transform-infrared spectrometry showed that the peak position of Ti-O-Si bond varied with the milling time. At the early stage, no characteristic peak of Ti-O-Si bond was observed, while at the later stage, new peaks at 902 cm-1and 937 cm-1appeared. Meanwhile, PQ/nano-TiO2composite-based interior paint exhibited significant DEF of 96.3% compared to that consisting of sole nanoTiO2of 92.0% under visible light illumination. As an abundant mineral resource, PQ would make interior paints with HCHO purifying effect much more efficient and cheaper.

关键词： powder quartz nano-TiO2 interior paint formaldehyde

First-Principles Study of the Structural, Electronic and Optical Properties ofHexagonal LiIO_(3)

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Chinese Physics Letters 2013年第6期30卷 174-177页

作者： YAO Gang CHEN Yu AN Xin-You JIANG Zhong-Qian CAO Lin-Hong WU Wei-Dong ZHAO Yan state key laboratory cultivation base for nonmetal composites and functional materials School of Materials Science and EngineeringSouthwest University of Science and TechnologyMianyang 621010 Science and Technology on Plasma Physics laboratory Research Center of Laser FusionCAEPMianyang 621900 College of Science Inner Mongolia University of TechnologyHohhot 010051

The structural parameters,electronic structure,chemical bonding and optical properties of hexagonal LiIO_(3) are investigated in the framework of density functional *** calculated lattice parameters are in agreement with the previous experimental *** band structure,density of states,and Mulliken charge population are obtained,and indicate that hexagonal LiIO_(3) has an indirect band gap of 2.81 ***,the optical properties are also calculated and analyzed in *** is shown that hexagonal LiIO_(3) is a promising dielectric material.

关键词： material. hexagonal (3)

The Structural and Electrical Properties of Al/Pb(Zr_(0.52)Ti_(0.48))O_(3)/Al_(2)O_(3)/Si with an Al_(2)O_(3) Layer Prepared by using the Molecular Atomic Deposition Method

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Chinese Physics Letters 2012年第12期29卷 243-245页

作者： YANG Yi ZHOU Chang-Jian PENG Ping-Gang XIE Dan REN Tian-Ling PAN Xiao LIU Jing-Song Tsinghua National laboratory for Information Science and Technology&Institute of Microelectronics Tsinghua UniversityBeijing 100084 Department of Applied Physics Yale UniversityNew Haven CT06520USA state key laboratory cultivation base for nonmetal composites and functional materials Southwest University of Science and TechnologyMianyang 621010

The structural and electrical properties of a metal-ferroelectric-insulator-semiconductor(MFIS)structure with an Al_(2)O_(3) layer prepared by using the molecular atomic deposition method and Pb(Zr_(0.52)Ti_(0.48))O_(3)(PZT)deposited by the radio frequency magnetron sputtering method are *** exhibits a very smooth surface and(110)orientation of the perovskite *** MFIS structure shows well-behaved clockwise capacitance-voltage hysteresis loops due to the ferroelectric polarization under a sweep voltage up to±40 *** windows of 1.9 V and 18.14 V in conjunction with leakage current density of 2.42×10^(-7) A/cm^(2) and 8.28×10^(-7) A/cm^(2) are obtained under sweep voltages of±5 V and±20 V,respectively.

关键词： ferroelectric hysteresis structure

Preparation and Characterization of Low Density Poly(Imino Imino Ketone)Foam

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Journal of Wuhan University of Technology(materials Science) 2016年第3期31卷 700-704页

作者：刘思曼常冠军 LUO Meiming Department of Chemistry and Chemical Engineering Mianyang Normanjun UniversityMianyang 621000China state key laboratory cultivation base for nonmetal composite and functional materials&School of Material Science and Engineering Southwest University of Science and TechnologyMianyang 621010China key laboratory of Green Chemistry&Technology of Ministry of Education College of ChemistrySichuan UniversityChengdu 610064China

Poly（Imino Ketone）（PIK） is a group of novel high performance polymer material with excellent thermal properties and dissolubility. Aiming at the requirements of inertial confined fusion （ICF） studies on low density polymer foams, we firstly synthesized poly（imino imino ketone）（PIIK） by palladium catalyzed C-N cross-coupling reaction, and successfully prepared the PIIK foam material with a density of 80-300 mg/cm3 by using PIIK as the raw material with thermal-induced phase separation and lyophilization technique. Mercury injection method was used to determine the structure of PIIK foams, and the results indicated that the mean pore diameter was lower than 5 ~tm and it had relatively high voidage and specific surface area.

关键词： poly(imino imino ketone) foam thermal-induced phase separation lyophilization technique

Solid-state reaction synthesis and chemical stability studies in Nd-doped zirconolite-rich ceramics

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Journal of Rare Earths 2018年第5期36卷 492-498页

作者： Dan Yin Kuibao Zhang Le Peng Zongsheng He Yuan Liu Haibin Zhang Xirui Lu state key laboratory cultivation base for nonmetal composite and Foundational materials Southwest University of Science and Technology Mianyang 621010 China National Defense key Discipline Lab of Nuclear Waste and Environmental Safety Southwest University of Science and Technology Mianyang 621010 China Institute of Nuclear Physics and Chemistry China Academy of Engineering Physics Mianyang 621900 China

In this study, Nd-bearing zirconolite-rich ceramics were prepared by solid-state reaction process using CaF2,ZrO2, Ti,TiO2, Fe2 O3 and Nd2O3 as the raw materials. Neodymium was used as trivalent actinide surrogate and designed to substitute the Ca and Zr sites of zirconolite with general stoichiometry of Ca1-xZr1-xNd2 xTi2O7（0≤x≤0.3）. Density of Fe-Nd-O sample reaches a maximum value of 4.13 g/cm^2 after being sintered at 1325 ℃ for 42 h. Three major phases, namely zirconolite, perovskite and pseudobrookite, are observed in all these samples. The EDX result shows that Nd2O3 can be successfully incorporated into the lattice structure of the prepared zirconolite-rich minerals and replace the Ca sites of zirconolite and perovskite with Fe3＋ as the charge-compensating ion. Furthermore, the thermal conductivities are all in the range of 1.51-1.67 W/（m·K）. The normalized elemental leaching rates of Ca and Nd in the Fe-Nd-0.2 sample keep in low values of 6.20 × 10^-2 and 4.86 × 10^-4 g/（m^2·d） after 42 d.

关键词： Zirconolite Perovskite Pseudobrookite Nd2O3 Chemical stability Rare earths

Effects of Strain Rate and Texture on the Tensile Behavior of Pre-strained NiCr Microwires

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Journal of Wuhan University of Technology(materials Science) 2018年第2期33卷 459-465页

作者：周秀文 QI Yidong LIU Xudong NIU Gao YANG Bo YANG Yi ZHU Ye YU Bin 吴卫东 Research Center of Laser Fusion China Academy of Engineering Physics Mianyang 621900 China Institute of Atomic and Molecular Physics Sichuan University Chengdu 610065 China state key laboratory cultivation base for nonmetal composites and functional materials Southwest University of Science and Technology Mianyang 621010 China

The stress–strain behavior and strain rate sensitivity of pre-strained Ni80Cr20（Ni20Cr） were studied at strain rates from 4.8×10^（–4）s^（–1） to 1.1×10^（–1）s^（–1）. Specimens were prepared through cold drawing with abnormal plastic deformation. The texture of the specimen was characterized using electron backscatter diffraction. Results revealed that the ultimate tensile strength and ductility of the pre-strained Ni20Cr microwires simultaneously increased with increasing strain rate. Twinning-induced negative strain rate sensitivity was discovered. Positive strain rate sensitivity was present in fracture flow stress, whereas negative strain rate sensitivity was detected in flow stress values of σ_（0.5%） and σ_（1%）. Tensile test of the pre-strained Ni20Cr showed that twinning deformation predominated, whereas dislocation slip deformation dominated when twinning deformation reached saturation. The trends observed in the fractions of 2°-5°, 5°-15°, and 15°-180° grain boundaries confirmed that twinning deformation dominated the first stage.

关键词： tensile behavior strain rate sensitivity Ni20Cr microstructure characterization microwire

Sm（Ⅲ）-Bi（Ⅲ） Heterometallic Complexes with Aminopolycarboxylate Ligand： Structure, Thermal Stability and Spectral Property

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Chinese Journal of Chemistry 2011年第12期29卷 2637-2642页

作者：蒋琪英邓洪权何平钟国清郁开北 state key laboratory cultivation base for nonmetal composites and functional materials Southwest University of Science and Technology Mianyang Sichuan 621010 China Branch of Chinese Academy of Sciences Chengdu Sichuan 610041 China

Samnium（Ⅲ）-bismuth（Ⅲ） heterobimetallic complexes, SmBi（edta）（NO3）2·7H2O （1） and SmBi（dtpa）（NO3）·3.5H2O（2）（edta=ethylenediaminetetraacetate, dtpa=diethylenetriaminepentaacetate）, were synthesized and characterized by means of X-ray single crystal diffraction, X-ray powder diffraction, elemental analysis, ICP, FT-IR spectra and thermal analysis. The structure analysis revealed that 1 is in crystalline and 2 is in non-crystal state. Complex 1 crystallizes in monoclinic, space group P2（1）/n with a= 1.2622（2） nm, b=0.81157（15） nm, c=2.3634（5） nm, β= 105.340（2）°, V=2.3347（8） nm3, Z=4, Dc=2.563 gocm^-3,μ=10.125 mm-1. Bridging edta4 anions between Bi（Ⅲ） atoms and Sm（Ⅲ） atoms result into infinite 3D network structure. Thermal decomposition of the two complexes proceeds in similar stages, i.e., dehydration, pyrolysis of ligand, and decomposition of salt, and the final residue is oxide. In addition, the spectral properties have been studied through FL spectra and UV-Vis DRS. The two complexes exhibit one broad band Bi 6s6p-6s2 emission under UV excitation and the characteristic Sm3＋ ion 4G5/2→6Hj/2 （J= 5, 7, 9, 11） transitions under visible light excitation, respectively.

关键词： heterometallic complex structure samnium(Ⅲ) bismuth(Ⅲ) spectral property

Novel Magnetic Properties of Single-Crystalline Bi_2Fe_4O_9 Nanosheets by Electron Spin Resonance

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矿物学报 2013年第S1期33卷 117-117页

作者： XIONG Ying WANG Bing state key laboratory cultivation base for nonmetal composites and functional materials Southwest University of Science and Technology

Magnetic properties of single-crystalline preferential {001}-oriented Bi2Fe4O9nanosheets with thickness of about 13 nm, synthesized via a facile hydrothermal method, have been investigated through variable temperature electron spin resonance measurement. A typical ferromagnetic state could be appeared in the measured temperature from 110 K to 300 K and the origin would be contributed to uncompensated surface spin due to its large surface-to-volume ratio and/or a few non-detectable impurities with strong magnetism. Interestingly, another weak ferromagnetic state could present below the temperature about 250 K, indicative of Neel temperature (TN) of antiferromagnetic state, which is slightly lower than that of bulksample of 265 K.

关键词： magnetic nanomaterials hydrothermal methods electron spin resonance

Theoretical prediction,synthesis,and crystal structure determination of new MAX phase compound V2SnC

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Journal of Advanced Ceramics 2020年第4期9卷 481-492页

作者： Qiang Xu Yanchun Zhou Haiming Zhang Anna Jiang Quanzheng Tao Jun Lu Johanna Rosén Yunhui Niu Salvatore Grasso Chunfeng Hu key laboratory of Advanced Technologies of materials Ministry of EducationSchool of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu610031China Science and Technology on Advanced functional composite laboratory Aerospace Research Institute of Materials&Processing TechnologyBeijing100076China School of Mechanical Electronic and Control EngineeringBeijing Jiaotong UniversityBeijing100044China Thin Film Physics Division Department of PhysicsChemistryand Biology(IFM)Linköping UniversityLinköpingSE-58183Sweden state key laboratory of Environment-friendly Energy materials Southwest University of Science and TechnologyMianyang621010China

Guided by the theoretical prediction,a new MAX phase V2SnC was synthesized experimentally for the first time by reaction of V,Sn,and C mixtures at 1000°*** chemical composition and crystal structure of this new compound were identified by the cross-check combination of first-principles calculations,X-ray diffraction(XRD),energy dispersive X-ray spectroscopy(EDS),and high resolution scanning transmission electron microscopy(HR-STEM).The stacking sequence of V2C and Sn layers results in a crystal structure of space group P63/*** a-and c-lattice parameters,which were determined by the Rietveld analysis of powder XRD pattern,are 0.2981(0)nm and 1.3470(6)nm,*** atomic positions are V at 4f(1/3,2/3,0.0776(5)),Sn at 2d(2/3,1/3,1/4),and C at 2a(0,0,0).A new set of XRD data of V2SnC was also *** calculations suggest that this new compound is stable with negative formation energy and formation enthalpy,satisfied Born-Huang criteria of mechanical stability,and positive phonon branches over the Brillouin *** also has low shear deformation resistance c44(second-order elastic constant,cij)and shear modulus(G),positive Cauchy pressure,and low Pugh’s ratio(G/B=0.500<0.571),which is regarded as a quasi-ductile MAX *** mechanism underpinning the quasi-ductility is associated with the presence of a metallic bond.

关键词： V2SnC new MAX phase compound crystal structure first-principles calculations