Electrical Properties and Temperature Stability of Cr2O3 Doped BS-PMS-PZT High-Power Piezoelectric Ceramics
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摘要:
采用固相烧结法制备掺杂不同原子分数（0~0.8%）Cr2O3的0.05BiScO3-0.05Pb（Mn1/3Sb2/3）O3-0.9Pb（Zr0.45Ti0.55）O3陶瓷,研究了Cr2O3掺杂量对陶瓷微观结构、电学性能及温度稳定性的影响。结果表明：不同Cr2O3掺杂量陶瓷均为钙钛矿结构,未检测到杂相峰；随着Cr2O3掺杂量的增加,陶瓷的三方相逐渐出现且含量增加,四方相含量略有下降,平均晶粒尺寸不断增大,相对密度先增大后减小。随着Cr2O3掺杂量的增加,陶瓷的压电常数与机械品质因数均先升后降,介电损耗增大,机电耦合系数基本先增后减,居里温度降低；当Cr2O3原子分数为0.4%时,陶瓷的综合电学性能最佳,并且温度稳定性良好,从室温到260 ℃,压电常数下降率仅为32%,低于DM-8型商用PZT-8改性压电陶瓷（53%）。
Abstract:0.05BiScO3-0.05Pb(Mn1/3Sb2/3)O3-0.9Pb(Zr0.45Ti0.55)O3 ceramics doped with different atomic fractions (0–0.8%) of Cr2O3 were prepared by solid-phase sintering method. The effects of Cr2O3 doping amounts on the microstructure, electrical property and temperature stability of the ceramics were investigated. The results show that the ceramics with different Cr2O3 doping amounts all had perovskite structures and no impurity was detected. With the increase of Cr2O3 doping amount, the tripartite phase gradually appeared and its amount intensity increased, the tetragonal phase amount decreased slightly, the average grain size continuously increased, and the relative density increased first and then decreased. With the increase of Cr2O3 doping amount, the piezoelectric constant and mechanical quality factor of the ceramics both increased and then decreased, the dielectric loss increased, the electromechanical coupling coefficient basically increased and then decreased, and the Curie temperature decreased. When the atomic fraction of Cr2O3 was 0.4%, the comprehensive electrical properties of ceramics were the best, and the temperature stability was good. From room temperature to 260 °C, the decreasing rate of piezoelectric constant of the ceramics with 0.4% atomic fraction of Cr2O3 was 32%, which was lower than that of DM-8 commercial PZT-8 modified piezoelectric ceramics (53%).
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图 1 不同Cr2O3掺杂量0.05BS-0.05PMS-0.9PZT陶瓷的XRD谱
Figure 1. XRD patterns of 0.05BS-0.05PMS-0.9PZT ceramics with different Cr2O3 doping amounts
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图 2 不同Cr2O3掺杂量0.05BS-0.05PMS-0.9PZT陶瓷的断面SEM形貌和晶粒尺寸分布
Figure 2. Cross-section SEM morphology and grain size distribution of 0.05BS-0.05PMS-0.9PZT ceramics with different Cr2O3 doping amounts
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图 3 不同Cr2O3掺杂量0.05BS-0.05PMS-0.9PZT陶瓷的相对密度
Figure 3. Relative density of 0.05BS-0.05PMS-0.9PZT ceramics with different Cr2O3 doping amounts
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图 4 0.05BS-0.05PMS-0.9PZT陶瓷的压电常数、机械品质因数、机电耦合系数和介电损耗随Cr2O3掺杂量的变化曲线
Figure 4. Piezoelectric constant and mechanical quality factor (a), electromechanical coupling coefficient and dielectric loss (b) vs Cr2O3 doping amount curves of 0.05BS-0.05PMS-0.9PZT ceramics
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图 5 不同Cr2O3掺杂量0.05BS-0.05PMS-0.9PZT陶瓷的介电温谱
Figure 5. Dielectric temperature spectra of 0.05BS-0.05PMS-0.9PZT ceramics with different Cr2O3 doping amounts
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图 6 不同Cr2O3掺杂量0.05BS-0.05PMS-0.9PZT陶瓷和DM-8型商用PZT-8改性压电陶瓷的压电常数随温度的变化曲线
Figure 6. Piezoelectric constant vs temperature curves of 0.05BS-0.05PMS-0.9PZT ceramics with different Cr2O3 doping amounts and of DM-8 commercial modified piezoelectric ceramics
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