该文采用传统固相反应法制备了W6+掺杂的0.07Pb(Sc0.5Nb0.5)O3-0.93Pb(Hf0.47Ti0.53)O3(PSN-PHT)陶瓷, 详细分析了样品的晶体结构、压电和介电性能。实验结果表明, W6+掺杂可以提高钙钛矿结构中三方相的含量, 有效增加晶粒尺寸, 提高压电系数。当W6+掺杂量(摩尔分数)为1.0%时, 样品具有最佳的压电和介电性能, 即d33=585 pC/N, TC=323 ℃, εr=2 088。同时, 样品的d33在200 ℃去极化温度下仍保持570 pC/N的高值, 且经过1 080 min保温后, 压电常数略微降低, 此时d33仍可达到537 pC/N, 变化仅为5.7%。上述结果表明, W6+掺杂不仅可以提高压电系数, 同时也可增强陶瓷的温度稳定性, 使该陶瓷体系能在更宽的温度范围内使用。

In this paper, W6+ doped 0.07Pb(Sc0.5Nb0.5)O3-0.93Pb(Hf0.47Ti0.53)O3 (PSN-PHT) ceramics were successfully synthesized by solid state reaction method, and the improvement of PSN-PHT ceramic properties was comprehensively analyzed from the aspects of microstructure, phase structure and electrical properties. The experimental results show that W6+ doping can increase the amount of rhombohedral in perovskite structure, effectively increase the grain size, and improve the piezoelectric coefficient. When the W6+ doping amount is 1.0 mol%, the sample has the best piezoelectric and dielectric properties, that is, d33=585 pC/N, TC=323 ℃, εr=2 088. More importantly, the d33 of PSN-PHT-1.0mol%WO3 ceramic still maintains a high value of 570 pC/N at the depolarization temperature of 200 ℃. After holding at 200 ℃ for 1 080 minutes, d33 can still reach 537 pC/N, with a change of only 5.7%. These results show that W6+ doping can improve the piezoelectric coefficient and enhance the temperature stability, so that it has a great application prospect in the field of high pressure-temperature service.