Piezoelectric properties of (Na0.5K0.5)(Nb1‐xSbx)O3‐SrTiO3 ceramics with tetragonal‐pseudocubic PPB structure. Issue 9 (30th March 2018)

• Record Type: Journal Article
• Authors: Kim, Dae‐Hyeon; Lee, Tae‐Gon; Cho, Sung‐Hoon; Lee, Ku‐Tak; Lee, Tae‐Ho; Hong, Youn‐Woo; Hong, Chang‐Hyo; Kim, Jeong‐Seog; Nahm, Sahn
• Is Part Of: Journal of the American Ceramic Society. Volume 101:Issue 9(2018)
• Page Start: 3997
• Page End: 4010
• Publication Date: 2018-03-30
• Subjects: lead‐free ceramics -- phase transition -- piezoelectric materials/properties; Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.15542
• Languages: English
• ISSNs: 0002-7820

Abstract

Abstract: CuO‐added 0.96(Na0.5 K0.5 )(Nb1‐ x Sbx )O3 ‐0.04SrTiO3 ceramics sintered at the low temperature of 960°C for 10 hours showed dense microstructures and high relative densities. The specimens with 0.0 ≤ x ≤ 0.04 had orthorhombic‐tetragonal polymorphic phase boundary (PPB) structure. Tetragonal‐pseudocubic PPB structure was observed in specimens with 0.05 ≤ x ≤ 0.07, while the specimen with x = 0.08 has a pseudocubic structure. The structural variation in the specimens is explained by the decreases in the orthorhombic‐tetragonal transition temperature and Curie temperature with the addition of Sb 5+ ions. The specimens with 0.05 ≤ x ≤ 0.07, which have tetragonal‐pseudocubic PPB structure, had large electric field‐induced strains of 0.14%‐0.016%. Moreover, these specimens also showed increased d 33 values between 280 pC/N and 358 pC/N. In particular, the specimen with x = 0.055 showed particularly enhanced piezoelectric properties: d 33 of 358 pC/N, k p of 0.45, and the electric field‐induced strain of 0.16% at 4.5 kV/mm.