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2016年全国压电和声波理论及器件应用研讨会

作者： Yong-qiang GUO Long-fei LI Key Laboratory of Mechanics on Disaster and Environment in Western China Ministry of Education and School of Civil Engineering and Mechanics Lanzhou University

ISBN: (纸本)9781509011902

Background, Motivation and Objective With the ultrafast development of information technology, there are urgent demands for acoustic wave devices that can be working at high and/or multiple frequency ranges, because these acoustic wave devices are the core components of intelligent devices with rapid-responsibility and multi-functionality. These acoustic wave devices may be realized through the advanced rod-type piezoelectric phononic crystals, which consist of periodically-arranged piezoelectric rod covered by electrodes and elastic rod. Because the longitudinal wave is relatively easy to manipulate even at high frequency ranges and the longitudinal waves in rod-type piezoelectric phononic crystals possess tunable band structures. Consequently, the analysis of longitudinal wave bands in rod-type piezoelectric phononic crystals, particularly the effect of various applied electrical boundary conditions on the band structures, is significant for the design of these wave devices. So far, analytical-based methods such as the transfer matrix method(TMM), the combination of spectral element method(SEM) and TMM, the Analytical Method(AM), and numerical-based methods such as the finite element method(FEM) have been proposed for the analysis of longitudinal wave bands in rod-type piezoelectric phononic crystals. Unfortunately, the analytical-based methods cease to be effective in the high frequency range since the classical rod theory was adopted, which is only valid within pretty low frequency range. The numerical-based method may be inefficient for the high frequency analysis since large number of elements and very small time step are required in this case. In order to analyze the high-frequency longitudinal wave bands in rod-type piezoelectric phononic crystals, a modified transfer matrix method(MTMM) is presented, which adopts the method of reverberation-ray matrix(MRRM) to derive the local transfer matrices of structural members. The tunability of longitudinal-wave band

关键词： Rod-type piezoelectric phononic crystals Modified transfer matrix method Method of reverberation-ray matrix Longitudinal-wave bands tunability

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Dielectric properties of BST/MZO ceramic composites

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中国科学:技术科学 2010年第4期 447-447页

作者： CUI JianDong,WANG Yi,DONG GuiXia & DU Jun Advanced Electronic Materials Institute,General Research Institute for Nonferrous Metals,Beijing 100088,China

Ba0.6Sr0.4TiO3/Mg1-xZnxO(MZO,x=0,0.05,0.10,0.15 and 0.20) ceramic composites were prepared by traditional ceramic *** crystal structure,fracture surface morphology,and dielectric properties were *** samples with x=0,0.05 and 0.10 exhibited favorable sintering behavior,and homogeneous diphase microstructure was obtained. Nevertheless,the microstructure of the samples with x=0.15 and 0.20 was inhomogeneous and abnormal grain growth could be observed,and the abnormal grain growth induced the degradation of dielectric *** sample with x=0.10 has relatively low dielectric loss(1.26×10-3) and the optimal FOM value(about 174) .

关键词： tunability dielectric property composites BST

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Dielectric tunable properties of BaTi4O9-doped Ba0.6Sr0.4TiO3 microwave composite ceramics

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中国科学:技术科学 2010年第4期 445-445页

作者： ZHANG JingJi,ZHAI JiWei ,JIANG HaiTao & YAO Xi Functional Materials Research Laboratory,Tongji University,Shanghai 200092,China

BaTi4O9-doped Ba0.6Sr0.4TiO3(BST) composite ceramics were prepared by the conventional solid-state reaction and their structure,dielectric nonlinear characteristics and microwave dielectric properties were *** secondary phase of the orthorhombic structure Ba4Ti13O30 is formed among BST composite ceramics with the increase of *** the same time,a duplex or bimodal grains size distribution shows fine grains in a coarse grain *** degree of frequency dispersion of dielectric permittivity below Tm is increased initially and then decreased with respect to *** the BaTi4O9 content increases,the tunability of composite ceramics decreases,while the Q value ***,70 wt%BaTi4O9-doped BST has a tunability～4.0%(under 30 kV/cm biasing) versus a permittivity～68 and quality factor ～134.1(at～3.2 GHz) .

关键词： tunability microwave dielectric properties composite ceramics

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Cross-dimensional electron-phonon coupling

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Journal of Semiconductors 2019年第9期40卷 1-1页

作者： Jun Zhang Institute of Semiconductors CAS

The electron-phonon coupling (EPC) in solids is the fundamental coupling related with their phonons and electronic *** the conventional EPC research,the phonons and electrons are in the same dimension regime,generally... 详细信息

关键词： Cross-dimensional EPC tunability

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