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Xiangyong Zhao,Dun Wu,Bijun Fang,Feifei Wang,Yanxue Tang,Wangzhou Shi,Jianning Ding 한국물리학회 2017 Current Applied Physics Vol.17 No.10
The 0.55Pb(Ni1/3Nb2/3)O3-0.05PbHfO3-0.4PbTiO3/Ni0.875Zn0.125Fe2O4 (PNNHT/NZF) 0e3 particulate composite ceramics were prepared by the conventional solid-state reaction method via introducing the nano-sized WO3 and CuO sintering aids by the self-combustion method. Due to the introducing of nanosized sintering aids, densified PNNHT/NZF composite ceramics are synthesized sintered at low sintering temperature. Furthermore, the nano-sized sintering aids act effectively as blocking layers, leading to compact composite ceramics with homogenously dispersed and isolated microstructure morphology, inhibiting inter-phase diffusion, avoiding interfacial chemical reaction, and achieving strong inter-phase coupling. Therefore, the synthesized PNNHT/NZF composite ceramics exhibit enhanced magnetoelectric properties.
Wanwan Ji,Bijun Fang,Xiangyong Zhao,Shuai Zhang,Xiaolong Lu,Xiaolong Lu 한국물리학회 2019 Current Applied Physics Vol.19 No.12
Due to the urgent demands for high-Curie temperature (TC/Tm) piezoelectric materials in geothermal exploration, aerospace and related fields, high-TC/Tm ferroelectrics have attracted booming research attention. The high-Tm 0.25Bi(Ni1/2Ti1/2)O3-0.75 Pb(Zr1/2Ti1/2)O3 (0.25BNT-0.75PZT) ceramics were prepared by solid-state sintering method and via partial oxalate route, where the 0.25BNT-0.75PZT ceramics prepared via the partial oxalate route exhibit better electrical properties (Tm=232 °C (10 kHz), εm=10963, Pr=26.14 μC/cm2, Ec=15.61 kV/cm, d33=521 pC/N, d33* = 553.3 pm/V, Kp=47.1%, and Qm=21.6). The nano-scale domain configuration of the ceramics was revealed by piezoelectric force microscopy (PFM), and the relationship between the micro-structure and macro-electrical properties was analyzed. The ferroelectric phase transition mechanism was studied by temperature dependent Raman spectroscopy. The reduction of energy barrier of lattice distortion and polarization deflection is caused by nanometer-sized domain structure, low symmetric polar nano-regions and/or coexistence of multi-ferroelectric phases, contributing to the excellent electrical properties of the 0.25BNT-0.75PZT ceramics prepared via the partial oxalate route.
MingYu Wang,Feng Zhao,JianLong Qiu,XiangYong Chen 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.4
This paper considers the finite-time synchronization problem of stochastic complex networks with mixed delays. A controller based on adaptive aperiodic intermittent control strategy is constructed, which can guarantee that network systems with unknown characteristics of the controlled object or a wide range of disturbance characteristics achieve synchronization in the finite-time. Moreover, relying on various inequality techniques, the finitetime synchronization criterion is obtained by establishing the Lyapunov function. Then, the synchronization of the stochastic network system can still be achieved, when the stochastic disturbance does not exist. Finally, the rationality of the theoretical results is tested by an example of Chua’s circuit system.
Wanwan Ji,Shuai Feng,Bijun Fang,Xiangyong Zhao,Shuai Zhang,Jianning Ding,Haosu Luo 한국물리학회 2018 Current Applied Physics Vol.18 No.3
High Curie temperature (TC) xBi(Ni1/2Ti1/2)O3-(1-x)Pb(Zr1/2Ti1/2)O3 (xBNT-(1-x)PZT, BNT-PZT) piezoelectric ceramics were prepared by the conventional ceramic processing. The composition-induced morphotropic phase boundary (MPB) and its influences on structure and electrical performance were investigated. The synthesized BNT-PZT ceramics exhibit rather pure perovskite structure, and densified microstructure morphology with uniform elementals distribution in both grains and grain boundaries. With increasing the content of Bi(Ni1/2Ti1/2)O3 (BNT), crystal structure of the BNT-PZT ceramics transform from tetragonal phase to rhombohedral phase, and dielectric response peaks change from narrow shape to very broad shape but all presenting dielectric frequency dispersion. The diffused and relaxation dielectric behavior can be fitted well by the quadratic law, and the Vogel-Fulcher law fitting provides additional information on the relaxation characteristic. The MPB effects are confirmed further by ferroelectric and piezoelectric properties measurements. High-TC combined with excellent piezoelectric performance can be realized in the BNT-PZT system, which presents promising applications in geothermal exploration, aerospace and related elevated temperatures fields.
Rongfeng Zhu,Qihui Zhang,Bijun Fang,Jianning Ding,Xiangyong Zhao,Haosu Luo 한국물리학회 2016 Current Applied Physics Vol.16 No.12
In situ temperature dependent ferroelectric domains dynamic evolution of the (001)pc oriented 0.91Pb(Zn1/3Nb2/3)O3-0.09PbTiO3 (PZNT91/9) single crystals was observed by polarized light microscopy (PLM) and real time synchrotron-radiation (SR) X-ray white-beam topography. Intricate domain structures including monoclinic phase are distinguished by PLM at room temperature, and irreversible domain configuration dynamic evolution upon thermal cycling is observed by both methods. Such irreversible domain evolution combined with coexistence of multi-phases and polarization rotation may be related to the extraordinary piezoelectric performance in the ferroelectric single crystals with the morphotropic phase boundary (MPB) compositions.
Renbing Sun,Bijun Fang,Limin Zhou,Qinhui Zhang,Xiangyong Zhao,Haosu Luo 한국물리학회 2011 Current Applied Physics Vol.11 No.1
(1-x)(Ni_0.8Zn_0.1Cu_0.1)Fe_2O_4/x0.58Pb(Ni_1/3Nb_2/3)O_3-0.02Pb(Zn_1/3Nb_2/3)O_3-0.05Pb(Ni_1/2W_1/2)O_3-0.35PbTiO_3((1-x)NZCF/xPNZNWT) magnetoelectric composites were prepared by conventional solidestate reaction method via low-temperature sintering technique. The low-temperature sintering technique can prepare dense composites, where the ferrite and piezoelectric phases coexist in the synthesized particulate composites, and no apparent mutual solubility takes place between the two phases. The (1-x)NZCF/xPNZNWT ceramic composites exhibit excellent integrated electrical properties, where diffused dielectric response peaks, typical P-E hysteresis loops and excellent piezoelectric property can be obtained. The (1-x)NZCF/xPNZNWT composites prepared by the low-temperature sintering process can be electrically and magnetically poled to exhibit apparent magnetoelectric effect, indicating that such technique is convenient to develop excellent particulate magnetoelectric materials in the future.