Dielectric and piezoelectric properties of KCT added (Li0.02(Na0.56 K0.46)0.98(Nb0.81Ta0.15Sb0.04)O3 ceramics

• Published in: Journal of electroceramics 2013-05, Vol.30 (3), p.139-144
• Main Authors: Noh, Jungrae, Yoo, Juhyun
• Format: Article
• Language: English
• Subjects: Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Composites; Crystallography and Scattering Methods; Electrochemistry; Glass; Materials Science; Natural Materials; Optical and Electronic Materials
• ISSN: 1385-3449; 1573-8663
• DOI: 10.1007/s10832-012-9775-7

In this study, [Li 0.02 (Na 0.56 K 0.46 ) 0.98 ](Nb 0.81 Ta 0.15 Sb 0.04 )O 3 + x mol% K 5.4 Cu 1.3 Ta 10 O 29 ceramics were fabricated by conventional solid-state solution processes. Then, their dielectric and piezoelectric properties were investigated. Sinterability of all samples was enhanced because K 5.4 Cu 1.3 Ta 10 O 29 (abbreviated as KCT) acted as sintering aids. As the result of XRD, phase structure showed orthorhombic symmetry when KCT ≤ 0.2 mol%. Whereas, the phase structure changed from orthorhombic symmetry to tetragonal symmetry when KCT ≥ 0.4 mol%. The results suggest that the orthorhombic and tetragonal phases co-exist in the composition ceramics with 0.2 mol% < KCT < 0.4 mol% at room temperature. The effects of the addition of KCT on the dielectric and piezoelectric properties were investigated. As the result, excellent properties of density=4.81[g/cm 3 ], electromechanical coupling factor (k p )=0.48 and piezoelectric constant(d 33 )=252[pC/N] were obtained in the composition ceramics with 0.4 mol%KCT.