Improving piezoelectric properties by controlling phase structure and crystal orientation. Issue 66 (29th August 2017)

• Record Type: Journal Article
• Authors: Liu, Baihui; Liu, Xing; Li, Peng; Li, Feng; Shen, Bo; Zhai, Jiwei
• Is Part Of: RSC advances. Volume 7:Issue 66(2017)
• Page Start: 41788
• Page End: 41795
• Publication Date: 2017-08-29
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c7ra07711d
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : 〈001〉-textured (1 − x )K0.48 Na0.52 Nb0.96 Sb0.04 O3 - x Bi0.50 (K0.48 Na0.52 )0.50 Zr0.50 Hf0.50 O3 lead-free ceramics prepared by templated grain growth (TGG) method are reported in this study. Abstract : In this study, 〈001〉-textured (1 − x )K0.48 Na0.52 Nb0.96 Sb0.04 O3 - x Bi0.50 (K0.48 Na0.52 )0.50 Zr0.50 Hf0.50 O3 [abbreviated as (1 − x )KNNS- x BKNZH, x = 0.01–0.04] lead-free ceramics were prepared by templated grain growth (TGG) method and sintered by a two-step process. Excellent longitudinal piezoelectric coefficient d 33 (434 pC N −1 ) and piezoelectric strain coefficient (722.5 pm V −1 ) are achieved in the textured 0.97KNNS-0.03BKNZH ceramics. The excellent piezoelectric properties can be ascribed to both the coexisting R–O–T multiphases and the 〈001〉 crystal orientation. In addition, a high electromechanical coupling coefficient k p (∼73.6%) is attained in textured ceramics with x = 0.02. The values of d 33 and k p also display high thermal stability (with rate of change < ±10%) over 25–120 °C in textured ceramics with x = 0.03 and 0.04. Excellent comprehensive properties suggest that 〈001〉-textured (1 − x )KNNS- x BKNZH ceramics are promising lead-free candidates for actuator and transducer applications.