Dynamic scaling hysteresis behavior and field-induced domain transition of 0.16PIN-0.62PMN-0.22 PT single crystals

Deng Tingyu,Fang Bijun,Zhu Rongfeng,Chen Jianwei,Luo Haosu 한국물리학회 2021 Current Applied Physics Vol.21 No.-

Due to the good dielectric, piezoelectric and ferroelectric properties, the pseudo-ternary ferroelectric single crystals Pb(In1/2Nb1/2)O3-Pb(Mg1/3Nb2/3)O3-PbTiO3 (PIN-PMN-PT) have been widely concerned and studied. In this study we found that the dynamic hysteresis loop area <A> with electric field E0 and frequency f0 of the 0.16 Pb(In1/2Nb1/2)O3-0.62 Pb(Mg1/3Nb2/3)O3-0.22PbTiO3 (0.16PIN-0.62PMN-0.22 PT) single crystals satisfies the relational equation <A> ∝ E0β f0α . In the <A> ∝ E0β relationship, both linear stages are found correlated with the low electric field in the first stage E0<Ec and the high electric field in the third stage E0 > 3Ec. The hysteresis loop area <A> with frequency f0 relationship satisfies the equation <A> ∝ f0α with roughly linear trend and the hysteresis loop area <A> decreases with increasing frequency f0. Such electric field dependent dynamic hysteresis scaling can be observed by polarized light microscopy.

Structure and magnetoelectric property of low-temperature sintering (Ni_0.8Zn_0.1Cu_0.1)Fe_2O_4/[0.58PNN-0.02PZN-0.05PNW-0.35PT] composites

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.

Preparation and properties of Nd-doped BCTH lead-free ceramics by solid-phase twin crystal method

He Xiyue,Fang Bijun,Zhang Shuai,Lu Xiaolong,Ding Jianning 한국물리학회 2022 Current Applied Physics Vol.38 No.-

0.5 mol% Nd-doped (Ba0.85Ca0.15)(Ti0.9Hf0.1)O3 (BCTH-Nd) lead-free ceramics were prepared by a solid-phase twin crystal method, where the effects of sintering condition on structure, electrical and optical properties were studied. All the sintered BCTH-Nd ceramics exhibit pure perovskite structure, dense microstructure with several micron grain size, which tends to increase with elevating sintering temperature. All synthesized ceramics have complex dielectric behavior, which presents normal ferroelectrics characteristic with slight dispersion phenomenon. The BCTH-Nd ceramics exhibit excellent piezoelectric and ferroelectric properties and acceptable dielectric performance when sintered at 1480 ◦C for 2 h. Under 269 nm light excitation, several fluorescent emission peaks are excited with a whole indigo fluorescence, where the strongest emission peak is emitted at 473 nm, corresponding to the 4G3/2 → 4I9/2 energy level transition of Nd3+. Multifunctional performance is fulfilled in the lead-free BCTH ceramics via rare earth doping, which can broaden the application fields of piezoelectricbased materials.

Enhancing electrical properties of high-Curie temperature piezoelectric ceramics BNT-PZT and their mechanism

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.

Enhancing densification and electrical properties of KNN-based lead-free ceramics via two-step sintering

Zhou Yu,Fang Bijun,Zhang Shuai,Lu Xiaolong,Ding Jianning 한국세라믹학회 2022 한국세라믹학회지 Vol.59 No.5

0.95(Li 0.02 Na 0.50 K 0.48 )(Nb 0.95 Sb 0.05 )O 3 -0.05AgTaO 3 (0.95LNKNS-0.05AT) lead-free piezoelectric ceramics were prepared by conventional ceramic processing via the two-step sintering process (abbreviated as TSS). The influences of sintering condi- tions in the first stage of the TSS process on densification, dielectric and piezoelectric properties of the 0.95LNKNS-0.05AT ceramics prepared by the TSS were deeply studied. By introducing TSS for preparing the 0.95LNKNS-0.05AT ceramics, the volatilization of alkali metal elements can be decreased and all the 0.95LNKNS-0.05AT ceramics show high densifica- tion. By optimizing the T 1 sintering temperature and t 1 holding time in the first stage of the TSS, the relative permittivity of the 0.95LNKNS-0.05AT ceramics sintered at 1140 °C for 0.5 h and 1050 °C for 8 h is increased to 5957 at 1 kHz, while the relative permittivity of the 0.95LNKNS-0.05AT ceramics prepared by the conventional sintering method (abbreviated as CS) is only 5205. The d 33 , g 33 , and K p values are increased from 134 pC/N, 14.6 × 10 –3  Vm/N, and 17.4% to 224 pC/N, 25.5 × 10 –3  Vm/N, and 31.9%, respectively. The 0.95LNKNS-0.05AT ceramics exhibit thermal activation relaxation behav- ior, and the high-temperature Cole–Cole impedance performance can be fitted well by the equivalent circuit (RQC) and equivalent circuit (RC) connected in series. The space charge effect conforms to the Arrhenius relationship, which presents a thermally activated hopping type process and relates to the oxygen vacancies generated by the evaporation of alkali metals during the TSS process.

Enhancing magnetoelectric properties of 0e3 particulate composite ceramics by introducing nano-sized sintering aids via self-combustion method

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.

Facile preparation and performance of novel high-TC xBi(Ni1/2Ti1/2)O3-(1-x)Pb(Zr1/2Ti1/2)O3 piezoceramics

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.

Irreversible phase transition characteristic of 0.91Pb(Zn1/3Nb2/3) O3-0.09PbTiO3 single crystals by domain observation

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.