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INVESTIGATION OF LANGANITE AND LANGATATE SINGLE CRYSALS FOR HIGH TEMPERATURE SENSING

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INVESTIGATION OF LANGANITE AND LANGATATE SINGLE CRYSALS FOR ...

CARRIER PHOTOGENERATION IN POLY(N-VINYL-CARBAZOLE)-BASED PHOTOCONDUCTIVE THIN-FILM DEVICES

2010全国压电和声波理论及器件技术研讨会

作者： Fa-peng YU~(1,2),Duo-rong YUAN~(1,*),xian ZHAO~1,Shu-jun ZHANG~(2,*) 1 state key Lab.of Crystal {3. and Institute of Crystal {3.,Shandong university, 27 Shanda South Road,Jinan,250100,china 2 {3. Research Institute,Pennsylvania state university, university Park,PA,16802,USA

LaGaNbO（LGN） and LaGaTaO（LGT） with trigonal 3. symmetry were grown by Czochralski （CZ） *** Resolution X-Ray Diffraction（HRXRD） measurement was carried out on the as-grown LGN and LGT crystals for crystal quality *** temperature dependent behaviors were investigated to explore the zero temperature coefficient of frequency（TCF） cuts at elevated temperature. Among the investigated crystal cuts,（XYt）9 cuts with length extensional vibration mode（LEM） were found to possess high turnover temperature around 250℃,for LGN and LGT ***,LGN（YX1）15°and LGT（YX1）20°crystal cuts,taking advantage of thickness shear vibration mode（TSM）,were found to exhibit strong frequency stability in the temperature range of 20～400℃,with turnover temperatures at 280℃and 180℃,*** high electromechanical coupling factor k（>10%）,high mechanical quality factor Q（>4000）,together with the zero TCF characteristics at elevated temperature,indicating LGN and LGT crystals potential for high temperature（100～400℃） sensing applications.

关键词： Zero TCF sensor piezoelectric single crystals langatate langanite

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Chinese Journal of Polymer Science 2006年第6期24卷 553-558页

作者： Hui Jin Yan-bing Hou xian-guo Meng Feng Teng key laboratory of Luminescence and Optical Information Ministry of Education Institute of Optoelectronie Teehnology Beijing Jiaotong University Beijing 100044 China

In this paper, photoexcitation processes in the bilayer devices based on inorganic materials and poly（N-vinylcarbazole）（PVK） were investigated. In order to clarify the roles of inorganic materials in photoconductive properties of bilayer devices, TiO2 and ZnS were chosen to combine with PVK. A model for generation of photocurrent （Iph） in single layer device of PVK was obtained. It is deduced that the recombination rate constant （Pcomb） and the ionization rate constant （y） ofexcitons should be considered as the most important factors for Iph. For inorganic materials （TiO2 or ZnS）/PVK bilayer devices, in reverse bias of-4 V, the photocurrent of 115 mA/cm^2 in the TiO2/PVK device was observed, but the photocurrent in the ZnS/PVK device was only 10 mA/cma under the illumination light of 3.0 nm and the light intensity of 14.2 mW/cm^2. The weaker photocurrent is attributed to the absorption of ZnS within UV region and the energy offset at the interface between PVK and ZnS, which impedes the transport of charge carriers.

关键词： Polymer Inorganic semiconductor Photoconductive Photogeneration.

Effect of surface modification on the radiation stability of diamond ohmic contacts

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Chinese Physics B 2024年第2期33卷 444-448页

作者：牟恋希赵上熳王鹏原晓芦刘金龙朱志甫陈良贤魏俊俊欧阳晓平李成明 Institute for Advanced materials and Technology University of Science and Technology BeijingBeijing 100083China School of mechanical Engineering University of Science and Technology BeijingBeijing 100083China School of Information Engineering Zhengzhou University of TechnologyZhengzhou 450044China state key laboratory of Intense Pulsed Radiation Simulation and Effect Northwest Institute of Nuclear TechnologyXi’an 710024China

The ohmic contact interface between diamond and metal is essential for the application of diamond *** modification can significantly affect the contact performance and eliminate the interface polarization ***,the radiation stability of a diamond detector is also sensitive to surface *** this work,the influence of surface modification technology on a diamond ohmic contact under high-energy radiation was *** radiation,the specific contact resistivities(ρc)between Ti/Pt/Au-hydrogen-terminated diamond(H-diamond)and Ti/Pt/Au-oxygenterminated diamond(O-diamond)were 2.0×10^(-4)W·cm^(2) and 4.3.10^(-3.Wcm^(2),*** 10 MeV electron radiation,the ρc of Ti/Pt/Au H-diamond and Ti/Pt/Au O-diamond were 5.3.10^(-3.W·cm^(2)and 9.1×10^(-3.W·cm^(2),*** rates of change of ρc of H-diamond and O-diamond after radiation were 2550%and 112%,*** electron radiation promotes bond reconstruction of the diamond surface,resulting in an increase in ρc.

关键词： single crystal diamond ohmic contact surface modification electron radiation

Sound absorption coefficient optimization of gradient sintered metal fiber felts

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Science china(Technological Sciences) 2016年第5期59卷 699-708页

作者： MENG Han REN Shu Wei XIN Feng xian LU Tian Jian MOE key laboratory for Multifunctional materials and Structures Xi'an Jiaotong University state key laboratory for Strength and Vibration of {3. Structures Xi'an Jiaotong University

An optimization method for sound absorption of gradient(multi-layered) sintered metal fiber felts is presented. The theoretical model based on dynamic flow resistivity is selected to calculate the sound absorption coefficient of the sintered metal fiber felts since it only requires three key morphological parameters: fiber diameter, porosity and layer thickness. The model predictions agree well with experimental measurements. Objective functions and constraint conditions are then set up to optimize separately the distribution of porosity, fiber diameter, and simultaneous porosity and fiber diameter in the metal fiber. The optimization problem for either a sole frequency or a pre-specified frequency range is solved using a genetic algorithm method. Acoustic performance comparison between optimized and non-optimized metal fibers is presented to confirm the effectiveness of the optimization method. Gradient sintered metal fiber felts hold great potential for noise control applications particularly when stringent restriction is placed on the total volume and/or weight of sound absorbing material allowed to use.

关键词： sound absorption optimization sintered metal fiber felts

Quasicrystal dissolution and performance of isothermally heat-treated Mg–Zn–Y alloy

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Rare Metals 2015年第7期34卷 452-456页

作者： Di-Qing Wan xian Luo Ya-Juan Liu Tian Yu key laboratory of Ministry of Education for Conveyance and Equipment East China Jiaotong University state key laboratory of Solidification Processing Northwestern Polytechnical University School of materials Science Northwestern Polytechnical University

Conventional casting method was employed to prepare Mg–Zn–Y alloy only with a-Mg+I-phase; however, the grain size of quasicrystal is quite large in the ascast ***, isothermal treatment was applied to refine the quasicrystal *** result shows that after the Mg–Zn–Y alloy was isothermally treated at 500 °C for several hours, the coarse quasicrystal can be gradually dissolved and thus ***, the dissolving processes of quasicrystal are slow first and then accelerate;after isothermally treated with 8 h at 500 °C, the quasicrystal is almost completely dissolved into the matrix only with 1–5 lm tiny quasicrystals *** of quasicrystal can markedly reduce the wear resistance, but increase the corrosion resistance.

关键词： Magnesium alloy Quasicrystal Isothermal treatment

Beam-focused SH wave transducer based on YSr_(3.(PO_(4))_(3.piezoelectric crystal for high temperature structural health monitoring

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Journal of Materiomics 2023年第3期9卷 577-586页

作者： Yuehao Du Guangda Wu Fapeng Yu Hongchen Miao xian Zhao Applied Mechanics and Structure Safety key laboratory of Sichuan Province School of Mechanics and Aerospace EngineeringSouthwest Jiaotong UniversityChengduSichuan610031China state key laboratory of Crystal {3. Center for Optics Research and EngineeringShandong UniversityJinan250100China

Guided-wave-based structural health monitoring(SHM)technology is of great importance for real-time inspection of high-temperature *** fundamental shear horizontal(SH_(0))wave is believed to be an ideal wave mode for developing SHM systems due to its nondispersive ***,currently very limited SH_(0)wave transducers can be used for SHM of high-temperature structures due to the limitation of ***,a novel YSr_(3.(PO_(4))_(3.(YSP)piezoelectric crystal in the space group I43. was *** show that the face-shear piezoelectric coefficient d_(14)(d_(14)=d_(25)=d_(3.))is 9.7 pC/N and varies little from 25 to 800℃.Then a beam-focused SH_(0)wave piezoelectric transducer is developed based on face-shear-mode YSP *** finite element simulations and experimental results indicate that the YSP-based transducer can excite pure SH_(0)wave and focus the wave energy along two opposite main ***,the obtained SH_(0)wave beam is highly concentrated with a small divergence angle of less than 3.°,originating from the high working frequency range from 3.0 to 400 *** excellent temperature stability of the as-grown YSP crystal makes the proposed SH_(0)wave piezoelectric transducer very suitable for SHM of high-temperature structures.

关键词： YSP piezoelectric crystal Pure face-shear vibration mode Shear horizontal wave Bidirectional transducer Structural health monitoring

Sintering characteristics, phase transitions, and microwave dielectric properties of low-firing [(Na_(0.5)Bi_(0.5))_(x)Bi_(1-x)](W_(x)V_(1-x))O_(4) solid solutionceramics

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Journal of Advanced Ceramics 2023年第6期12卷 1178-1188页

作者： xian Xue Xiaomeng Li Changli Fu Yan Zhang Jing Guo Hong Wang state key laboratory for {3. behavior of materials Faculty of Electronic and Information EngineeringXi'an Jiaotong UniversityXi'an 710049China state key laboratory for {3. behavior of materials School of Materials Science and EngineeringXi'an Jiaotong UniversityXi'an 710049China Department of materials Science and Engineering&Shenzhen Engineering Research Center for Novel Electronic Information materials and Devices Southern University of Science and TechnologyShenzhen 518055China Department of Physiology and Pathophysiology Shaanxi Engineering and Research Center of VaccineKey Laboratory of Environment and Genes Related to Diseases of Education Ministry of ChinaSchool of Basic Medical SciencesXi'an Jiaotong UniversityXi'an 710061China

A series of high-k[(Na_(0.5)Bi_(0.5))_(x)Bi_(1-x)](W_(x)V_(1-x))O_(4)(abbreviated as NBWV(x value))solid solution ceramics with a scheelite-like structure are synthesized by a modified solid-state reaction method at the temperature range of 680-760 C.A monoclinic(0≤x3.)/W^(6+) complex substitution on microwave dielectric properties is investigated in *** compositional series possess a wide range of variable relative permittivity(er=24.8-80)and temperature coefficient of resonant frequency(TCF value,-271.9-188.9 ppm/℃).The maximum permittivity of 80 and a high Qxf value of~10,000 GHz are obtained near the phase boundary at x=***,the temperature-stable dielectric ceramics sintered at 680 C with excellent microwave dielectric properties of ε_(r)=80.7,Qxf=9400 GHz(at 4.1 GHz),and TCF value=-3.8 ppm/℃ are designed by mixing the components of x=0.07 and *** summary,similar sinterability and structural compatibility of scheelite-like solid solution systems make it potential for low-temperature co-fired ceramic(LTCC)applications.

关键词： structural phase transition order-disorder phenomena microwave ceramics dielectric behavior low sintering temperatures

Uniform small metal nanoparticles anchored on CeO2 nanorods driven by electroless chemical deposition

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Rare Metals 2020年第7期39卷 806-814页

作者： Zheng Chen Fang-xian Cao Wei Gao Qing-Chen Dong Yong-Quan Qu MOE key laboratory of Interface Science and Engineering in Advanced materials and Research Center of Advanced materials Science and Technology Taiyuan University of TechnologyTaiyuan 030024China Center for Applied Chemical Research Frontier Institute of Science and TechnologyXi’an Jiaotong UniversityXi’an 710049China

We report a facile electroless chemical deposition(ECD)method to deposit uniform Pd nanoparticles((2.5±0.6)nm)on CeO2 nanorods(PdNPs/CeO2-ECD)through the interface redox reaction between the reduced CeO2 and *** NPs/CeO2-ECD exhibits a stronger electronic metal-support interaction(EMSI)evidenced by higher reducibility and stronger anti-sintering capability at high temperatures,compared to that prepared by the conventional impregnation *** an EMSI effect of PdNPs/CeO2-ECD significantly improves its catalytic activity in CO ***,the chlorine residue-free catalysts through ECD process avoid the deleterious effect of chlorine on CO *** ECD process can further be extended to deposit various uniform nanoscaled noble metals(Au,Ag,Pt,Ru,Rh,etc.)on CeO2,which may deliver their potentials in advanced catalysis.

关键词： Electroless chemical deposition Electronic metal-support interaction Pd/CeO2 CO oxidation

Fractal Analysis on 3.D Surfaces of C.G. Irons under Dry Sliding

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Fractal Analysis on 3-D Surfaces of C.G. Irons under Dry Sli...