A5100412407- Ferroelectric and Piezoelectric Materials
- Acoustic Wave Resonator Technologies
- Multiferroics and related materials
- Microwave Dielectric Ceramics Synthesis
- Advanced Radiotherapy Techniques
- Superconducting Materials and Applications
- Medical Imaging Techniques and Applications
- Nuclear Physics and Applications
- Photorefractive and Nonlinear Optics
- Machine Learning in Materials Science
- Thermography and Photoacoustic Techniques
- Gamma-ray bursts and supernovae
- Radiation Therapy and Dosimetry
- ZnO doping and properties
- GaN-based semiconductor devices and materials
- Thermal Radiation and Cooling Technologies
- Advanced Thermoelectric Materials and Devices
- Geometric Analysis and Curvature Flows
- Cystic Fibrosis Research Advances
- Pulsars and Gravitational Waves Research
- Particle Detector Development and Performance
- Thermal properties of materials
- Transition Metal Oxide Nanomaterials
- Radiomics and Machine Learning in Medical Imaging
- Dark Matter and Cosmic Phenomena
Center for High Pressure Science and Technology Advanced Research
2015-2022
Shandong University
2021
Harbin Institute of Technology
2021
Harbin Normal University
2021
Shandong University of Technology
2021
Queen's University
2019
Wuhan University
2016-2019
Union Hospital
2019
Huazhong University of Science and Technology
2019
Beaumont Health
2016-2019
A large coercive field (EC) and ultrahigh piezoelectricity are essential for ferroelectrics used in high-drive electromechanical applications. The discovery of relaxor-PbTiO3 crystals is a recent breakthrough; they currently afford the highest piezoelectricity, but usually with low EC. Such performance deterioration occurs because high interlinked an easy polarization rotation, subsequently favoring dipole switch under small fields. Therefore, search both EC has become imminent challenge....
Mn modified rhombohedral Pb(In0.5Nb0.5)O3-Pb(Mg1/3Nb2/3)O3-PbTiO3 (PIN-PMN-PT:Mn) single crystals poled along [011]C crystallographic direction exhibit a “2R” engineered domain configuration, with macroscopic mm2 symmetry. The complete sets of material constants were determined using combined resonance and ultrasonic methods, compared to [001]C PIN-PMN-PT:Mn crystals. thickness shear piezoelectric coefficient d15 electromechanical coupling factor k15 found be on the order ∼3000 pC/N 0.92,...
Mn modified 0.26Pb(In1/2Nb1/2)O3−0.42Pb(Mg1/3Nb2/3)O3−0.32PbTiO3 (PIN-PMN-PT:Mn) single crystals with orthorhombic perovskite crystal structure were polarized along [011] direction, resulting in the domain state “1O.” The complete set of material constants was determined using combined resonance and ultrasonic methods. thickness shear piezoelectric coefficient d15 electromechanical coupling factor k15 found to be on order 3100 pC/N 94%, respectively, much higher than longitudinal d33 ∼ 270...
Ternary single crystals Pb(In0.5Nb0.5)O3-Pb(Mg1/3Nb2/3)O3-PbTiO3 with monoclinic phase poled along [011] direction show domain state (1O state) macroscopic mm2 symmetry. The complete set of material constants was determined using the combination impedance and ultrasonic methods. thickness shear vibrations in give highest piezoelectric coefficients, values being on order d15 = 4550 pC/N d24 4100 pC/N. rotated value d33* [001], calculated data, is good agreement [001] multidomain crystal, 1790...
The phase-transition sequence of 0.67Pb(Mg1/3Nb2/3)-0.37PbTiO3 (PMN-0.37PT) single crystals driven by the electric (E) field and temperature is comprehensively studied. Based on strain-E loop, polarization-E evolution domain configurations, E along [011] C induced phase transitions have been confirmed to be as follows: tetragonal (T) → monoclinic (MC ) orthorhombic (O) phase. As decreases, O cannot maintained transformed MC phase, then coexistence state T phases. In addition, complete sets...
Stable weighted minimal surfaces in manifolds with non-negative Bakry-Emery Ricci tensor Gang LiuIn this paper, we study stable hypersurfaces curvature.We will give some geometric and topological applications.In particular, partial classification of complete 3-manifolds curvature assuming that f is bounded.
We describe the development of a future gamma-ray/cosmic-ray mission called Advanced Particle-astrophysics Telescope (APT). The instrument will combine pair tracker and Compton telescope in single monolithic design. By using scintillating fibers for wavelength-shifting to readout CsI detectors, achieve an order magnitude improvement sensitivity compared with Fermi but fewer channels, lower complexity. incorporating multiple imaging over very large effective area, also orders MeV other...
The Advanced Particle-astrophysics Telescope (APT) is a mission concept of next-generation space-based gamma-ray and cosmic-ray observatory. We present the simulation instrument performance Antarctic Demonstrator for APT (ADAPT), proposed long-duration balloon based on small portion full detector. construct semianalytical model MeV-GeV background ADAPT observations from previous high-altitude experiments simulations upper atmosphere. find that dominated by albedo earth's In presence this...
Linear electro-optic properties of 0.24Pb(In1/2Nb1/2)O3-(0.76 - x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 single crystals, with compositions in the rhombohedral, morphotropic phase boundary (MPB) and tetragonal phases, have been investigated. Very large effective coefficient [Formula: see text] (204 pm/V) was observed a crystal MPB composition when it is poled along [001]. The rhombohedral (x = 0.27 0.30) crystals [111] direction 0.39) [001] are domain, their coefficients ([Formula: 76, 94, 43 pm/V for x...
Enhancing the mechanical quality factor, Qm, in ferroelectrics is one of most critical issues for high-power devices, such as therapeutic ultrasonic transducers, large-displacement actuators, and high-frequency transducers. Although previous results have indicated that Qm could be improved through acceptor doping, mechanism behind this effect still a mystery, there been few reports on optimization energy loss ultrahigh piezoelectric materials relaxor-PbTiO3 (PT) single crystals. In work, we...
High piezoelectric activity of ferroelectrics with morphotropic phase boundary (MPB) compositions has been the focus numerous recent investigations. The concept a bridging low-symmetry between competing structures MPB composition remains controversial due to compositional inhomogeneity near and lack appropriate experimental techniques delineate complex crystal structures. We have studied simple ferroelectric BaTiO3 by employing high resolution synchrotron-based technique, in which formation...
The temperature dependence of the complete set elastic, dielectric, and piezoelectric constants KTiOPO4 single crystal has been measured from 20 °C to 150 °C. All 17 independent for mm2 symmetry were one sample using extended resonance ultrasound spectroscopy (RUS), which guaranteed self-consistency matrix data. unique characteristics RUS method allowed accomplishment such a challenging task, could not be done by any other existing methods. It was found that elastic (c11E, c13E, c22E, c33E)...
A transmission X-ray microscope using Fresnel zone-plates (FZPs) has been installed at U7A beamline of National Synchrotron Radiation Laboratory (NSRL). The objective FZP with 45 nm outermost zone width delivers a sub-50 resolution. gold phase ring 2.5 μm thickness and 4 was placed the focal plane 8 keV to produce negative Zernike contrast. series samples were used test performance contrast microscopy.
Abstract Transparent conducting oxides (TCO) with high electrical conductivity and visible light transparency are desired for a wide range of high‐impact engineering. Yet, usually, compromise must be made between transparency, limiting the practical application TCO to next level. Furthermore, performance is highly sensitive composition, so conventional synthesis methods, such as chemical doping, cannot unravel mysteries quantitative structure–performance relationship. Thus, improving...
The exploration of next-generation materials and the underlying mechanisms for high ionic conductivity have been mainstay study in solid state field, but with limited success. Here, we performed closely integrated situ high-pressure structural electronic characterizations on SrCoO2.5, a typical material fuel cell application. We discovered that activation energy transport decreased by approximately 47% at 13.6 GPa upon compression, demonstrating large enhancement conductivity. Such desired...
In this work, a series of quaternary AlxInyGa1−x−yN thin films have been successfully achieved using metal organic chemical vapor deposition (MOCVD) method with adjustable trimethylaluminum (TMA) flows. Surface morphology and optical properties evaluated. The indium segregation effect on the enhancement UV luminescence emission in AlxInyGa1-x-yN increasing TMA flows was investigated. Our results shed some lights future materials design LED/LD applications.
Objective To evaluate the effect of discrepancy dose calculation results different algorithms upon CyberKnife lung tumor treatment plan, and assess impact volume location on results. Methods Thirty-two cases tumors were treated with MultiPlan 5.2.1 planning system VSI.Ray Tracing Monte Carlo adopted to calculate distribution, then statistically compared between two algorithms. Results For enrolled cases, these demonstrated that deviation range prescription coverage target (PTV),...
The light extraction efficiency caused by total internal reflection is low. Based on the analysis of existing technology, a new design scheme proposed in this paper to improve efficiency. air gap photonic crystal embedded GaN-based patterned sapphire substrate, which can reduce line misalignment and structure LED epitaxial layer composed an electron emission layer, quantum well light-emitting recombination region, blocking layer. Experimental results show that method significantly improves light.
Purpose: To quantitatively evaluate four different Proton SFUD PBS initial planning strategies for lung mobile tumor. Methods and Materials: A virtual patient’s four-dimensional computed tomography (4DCT) was generated in this study. avoid the uncertainties from target delineation imaging artifacts, a sphere with diameter of 3 cm representing rigid (GTV) inserted into right side lung. The motion is set superior-inferior (SI) direction ?5 mm to 5 mm. Four were used based on: 1)...
Based on the nonlinear flux creep model, V-I curves are numerically studied considering influences of surface barrier. The barrier to critical current high temperature superconductors (HTSC’s) carried out. results show that as strength increases, increases. Besides, with existence barrier, history effect was found in loop, which indicates is one important factors make effect.