Comprehensive properties and thermal stability of Ta2O5-doped PIN-PHT ceramics. Issue 22 (15th November 2022)

• Record Type: Journal Article
• Authors: Chen, Yan; Shi, Huanli; Zhang, Maolin; Zhang, Dongyan; Li, Zhimin; Xu, Yonghao; Jin, Li; Yan, Yangxi
• Is Part Of: Ceramics international. Volume 48:Issue 22(2022)
• Page Start: 32908
• Page End: 32916
• Publication Date: 2022-11-15
• Subjects: PIN-PHT ceramics -- Ta2O5 doping -- Performance retention rate -- Electromechanical coupling factor; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.07.219
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Herein, high-performance 0.11 Pb(In1/2 Nb1/2 )O3 -0.89 Pb(Hf0.47 Ti0.53 )O3 -0.8Ta2 O5 (PIN-PHT-0.8Ta) ceramics are successfully synthesized. In addition, performance improvement is comprehensively analyzed from viewpoints of microstructure, phase structure and electrical properties. Experimental results reveal that the addition of Ta2 O5 changes phase structure of PIN-PHT ceramics from ferroelectric tetragonal phase to rhombohedral phase. This leads to the appearance of morphotropic phase boundaries (MPBs). At the same time, the addition of Ta2 O5 reduces grain size and enhances grain uniformity. Also, Ta2 O5 doping improves internal and external contribution of piezoelectric response, which greatly improves dielectric, piezoelectric and ferroelectric properties of PIN-PHT. Key performance parameters include d 33, k p, T C, ε r and tan δ, which are found to be 630 pC/N, 0.73, 322.6 °C, 1917 and 1.55%, respectively. In particular, thermal stability of PIN-PHT-0.8Ta ceramics is found to be higher than PZT-based ceramics, as well as d 33 value and performance retention rate of PIN-PHT-0.8Ta are found to be 560 pC/N and 89% at 300 °C, respectively, which are far superior to commercial PZT-5 and PZT-8 ceramics. These properties indicate potential of PIN-PHT-0.8Ta ceramics in high-temperature applications.