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Jian Ma,Dingquan Xiao,Bo Wu,Jia-gang Wu,Jian-guo Zhu 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.2
0.95(Na0.96−xKxLi0.04)(Nb0.89Sb0.07Ta0.04)O3-0.05KNbO3 (abbreviated as KxNLNST-KN, x =0.32 − 0.52) lead-free piezoelectric ceramics were prepared by using the conventional solid-statesintering method, and the intentional addition of a pre-calcined KNbO3 powder was used as asintering aid that might inhibit and compensate for the volatilization of alkali metals during thesintering process. The preparation of the ceramics and the effects of K/Na ratio on the structureand the electrical properties of these ceramics were studied in detail. Compared with the relativelyhigher sintering temperature of Li-, Sb-, and Ta-modified KNN ceramics reported in the literature,the dense ceramic samples were obtained at a reduced temperature of 1060 C, and the ceramicswith x = 0.44 possessed optimal properties: d33 = 298 pC/N, kp = 48%, Pr = 21.9 μC/cm2, andEc = 11.5 kV/cm.
(Ba, Ca)(Ti, Zr)O3-BiFeO3 lead-free piezoelectric ceramics
Jiagang Wu,Wenjuan Wu,Dingquan Xiao,John Wang,Zhenchun Yang,Zhihang Peng,Qiang Chen,Jianguo Zhu 한국물리학회 2012 Current Applied Physics Vol.12 No.2
Effects of BiFeO3 (BFO) content on the microstructure and electrical properties of Ba0.85Ca0.15Ti0.90Zr0.10O3(BCTZ) ceramics prepared by normal sintering in air were investigated. A stable solid solution is formed between BCTZ and BFO. The grain size gradually becomes smaller, and the ceramics become denser with increasing the BFO content. The Curie temperature, dielectric constant, and dielectric loss of BCTZ ceramics decrease simultaneously with the introduction of BFO. Moreover, the remanent polarization reaches a maximum at x ¼ 0.2 mol%, and the coercive field continuously increases with increasing the BFO content due to the introduction of BFO with a higher coercive field. Improved piezoelectric properties (d33 w 405 pC/N and kp w 0.44) are demonstrated for the BCTZ ceramic with x ¼ 0.2 mol%.
Chong Ma,Gang Chen,Dingquan Liu,Rong-Jun Zhang,Junbo He,Xudan Zhu,Daqi Li 한국광학회 2021 Current Optics and Photonics Vol.5 No.5
Dichroic beam-splitter (DBS) with polarization-maintaining took an important role in the free space quantum telecommunication tests on the Micius satellite of China. In this presentation, we designed and prepared a 50 layer polarization-maintaining DBS coating by a dual ion beam sputtering deposition (Dual-IBS) method. In order to solve a stress problem, an 18 layer special anti-reflection (AR) coating with similar physical thickness ratio was deposited on the backside. By stress compensation, the surface flatness RMS value of the DBS sample decreased from 0.341 λ (@632.8 nm) to 0.103 λ while beam splitting and polarization maintaining properties were almost kept unchanged. Further, we discussed the mechanism of film stress and stress compensation by equation deduction and found that total stress had a strong relationship with the total physical thickness and the ratio of layer materials.
Zhihang Peng,Dongxu Yan,Qiang Chen,Deqiong Xin,Dan Liu,Dingquan Xiao,Jian-guo Zhu 한국물리학회 2014 Current Applied Physics Vol.14 No.12
Aurivillius phase Bi3Ti1xTaxNb1xWxO12 high temperature piezoceramics were prepared by a conventional solid state reaction method. The crystal structure, dielectric, electrical conduction and piezoelectric properties were systematically studied. Pure or modified Bi3TiNbO9 ceramics revealed the presence of only two-layered Aurivillius phase, indicating that Ta/W doping entered into the B-site of pseudo-perovskite structure and formed solid solutions. The Curie temperature had a strong reliance on the structural distortion. Furthermore, Ta/W dopants act as a donor doping, decrease the number of oxygen vacancies and facilitate the domain wall motion. As a result, Ta/W modifications significantly increase the DC resistivity and piezoelectric properties. Bi3Ti0.98Ta0.02Nb0.98W0.02O12 ceramics possess the optimum d33 value (~12.5 pC/N) together with a high TC point (~893 C). Moreover, the resonance eantiresonance spectra demonstrate that the Ta/W-BTN ceramics are indeed piezoelectric in nature at 600 C. The d33 value of BTTNW-2 ceramic remains ~12.2 pC/N after annealing at 700 C. These factors suggest that the BTTNW-based ceramic is a promising candidate for ultra-high temperature sensor applications.
Xiaopeng Wang,Jia-gang Wu,Ting Zheng,Xiaojing Cheng,Binyu Zhang,Dingquan Xiao,Jian-guo Zhu 한국물리학회 2014 Current Applied Physics Vol.14 No.5
In this work, 0.96(K0.48Na0.52)1xLixNbO3e0.04Bi0.5Na0.5ZrO3 lead-free piezoceramics were prepared using the conventional solid state reaction method in order to attain both a high TC and an enhanced d33. The effect of Li content on their phase structure, electrical properties, and stability was systematically investigated. These results indicate that adding Li could result in the increase of TC and the decrease of TOeT. Here we obtain the ceramics with an orthogonaletetragonal phase boundary in the composition of x ¼ 0.02, and then enhanced piezoelectric properties and a high Curie temperature (i.e., d33 w 255 pC/N, kp w 41%, and TC w 360 C) were observed, showing the realization of our objective. In addition, a good stability of piezoelectric and ferroelectric properties has been shown in such a material system.
Binyu Zhang,Jiagang Wu,Xiaopeng Wang,Xiaojing Cheng,Jianguo Zhu,Dingquan Xiao 한국물리학회 2013 Current Applied Physics Vol.13 No.8
The BaZrO3 and Ta have been used to improve piezoelectric properties of (K, Na)NbO3 ceramics by the construction of the phase boundary, and (1 x)K0.48Na0.52(Nb0.95Ta0.05)O3exBaZrO3 [(1 x)KNNTexBZ]ceramics were prepared by the conventional solid-state method. The effect of BZ content on their phase structure, microstructure, and electrical properties has been investigated. A rhombohedral and orthorhombic phase coexistence has been observed in the compositional range of 0.05 x 0.07. With increasing BZ content, their Tc and Toet values decrease gradually, and the dielectric constant increases linearly. The ceramic with x ¼ 0.06 exhibits an enhanced piezoelectric behavior (d33 w 193 pC/N and kp w 32.6%) because of the coexistence of two phases together with a dense microstructure. As a result,the construction of a rhombohedral and orthorhombic phase boundary is an effective way to improve the piezoelectric properties of KNN-based ceramics.
Xiaoyu Chen,Jiagang Wu,Xiaojing Cheng,Bo Wu,Wenjuan Wu,Dingquan Xiao,Jianguo Zhu 한국물리학회 2012 Current Applied Physics Vol.12 No.3
[Li0.03(K0.48Na0.52)0.97](Nb0.97Sb0.03)O3-(Ba0.85Ca0.15)(Ti0.90Zr0.10)O3 [(1-x)LKNNS-xBCTZ] lead-free piezoelectric ceramics were prepared by the conventional solid state method, and effects of BCTZ content on the piezoelectric properties of LKNNS ceramics were mainly investigated. A stable solid solution has been formed between LKNNS and BCTZ, and a morphotropic phase boundary of (1-x)LKNNS-xBCTZ ceramics is identified in the range of 0 < x ≤ 0.02. The Curie temperature of (1-x)LKNNS-xBCTZ ceramics decreases with increasing BCTZ content. A higher εr value and a lower tan d value are demonstrated for the (1-x)LKNNS-xBCTZ ceramic with x = 0.02. The (1-x)LKNNS-xBCTZ ceramic with x = 0.02 has an enhanced electrical behavior of d33w237 pC/N, kpw 48.6%, 3 rw1451, tan d w0.037, and Tcw335 ℃. As a result, (1-x)LKNNS-xBCTZ ceramics are promising candidate materials for the field of lead-free piezoelectric materials.
Meng Jiang,Xuhai Li,Jiliang Zhu,Xiaohong Zhu,Wei Shi,Lihua Li,Dingquan Xiao,Jianguo Zhu 한국물리학회 2010 Current Applied Physics Vol.10 No.2
Pb0.99Nb0.02(Zr0.95Ti0.05)0.98O3 (PNZT95/5) ceramics with 1 mol% and without Mn doping were prepared via conventional solid state reaction process. X-ray diffraction patterns show that the PNZT95/5 and Mn-doped PNZT95/5 (PNZTM95/5) ceramics, with composition near the boundary of the ferroelectric phase (FE)/antiferroelectric phase (AFE), have a rhombohedral perovskite structure. The ferroelectric behavior of PNZT95/5 ceramics is strongly affected by Mn doping. Without any aging process the PNZTM95/5 ceramics possess double hysteresis loops (P–E loops), whereas the PNZT95/5 ceramics possess normal single hysteresis loops. Due to the defect dipoles formed by effectively negatively charged Mn3+ dopants and positively charged O2- vacancies, the PNZTM95/5 ceramics exhibit the double P–E loops. The defect dipole effect has been proved by investigating the P–E loops under different external fields. As a result, the PNZTM95/5 ceramics become ‘‘hardened”, exhibiting a high mechanical quality factor (1300).