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(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%.
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.
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.