김미로 윤석진 최지원 2024-01-20T19:32:39Z 2024-01-20T19:32:39Z 2021-09-06 2010-04 1225-5475 https://pubs.kist.re.kr/handle/201004/131567 0.96(Na0.5K0.5)NbO3-0.04(Ba(1-x)Srx)TiO3 lead free piezoelectric ceramics were synthesized to enhance the piezoelectric properties of (Na,K)NbO3. The systhesis and sintering method were the conventional solid state reaction method and general sintering method in air atmosphere. The polymorphic phase transition(PPT) was observed at all composition(0 ≤ x ≤ 0.05) when (Ba(1-x)Srx)TiO3 were added in the (Na0.5K0.5)NbO3. As Sr concentration was increased, grain size, dielectric loss(tanδ) and mechanical quality factor(Qm) were decreased and piezoelectric constant(d33) and electromechanical coupling factor(kp) were increased within a limited value. The optimized piezoelectric and properties, d33, kp, Qm, and tand, of 0.96(Na0.5K0.5)NbO3-0.04(Ba(1-x)Srx)TiO3 were 139 pC/N, 0.31 %, 95, 0.04 at the composition of x=0.04. Korean 한국센서학회 0.96(Na0.5K0.5)NbO3-0.04(Ba(1-x)Srx)TiO3 무연 세라믹스의 유전 및 압전 특성 Dielectric and piezoelectric properties of 0.96(Na0.5K0.5)NbO3-0.04(Ba(1-x)Srx)TiO3 lead-free ceramics Article 2 센서학회지, v.19, no.2, pp.155 - 159 센서학회지 19 2 155 159 kci ART001431886 piezoelectric properties lead-free NKN BST