Author/Authors :
AKÇA, Erdem Gebze Yüksek Teknoloji Enstitüsü - Malzeme Bilimi ve Mühendisliği Bölümü, Turkey , TATAR, İstek Meteksan Savunma Sanayii A.Ş., Turkey , YILMAZ, Hüseyin Gebze Yüksek Teknoloji Enstitüsü - Malzeme Bilimi ve Mühendisliği Bölümü, Turkey , DURAN, Cihangir Meteksan Savunma Sanayii A.Ş., Turkey
Title Of Article :
Inducing Electrically Hard Character in Ternary [Pb(Mg1/3Nb2/3)O3, Pb(Yb1/2Nb1/2)O3, PbTiO3] Piezoceramics by Mn Doping
Abstract :
In this study, dielectric and electromechanical properties of Mn doped Pb(Mg1/3Nb2/3)O3-Pb(Yb1/2Nb1/2)O3-PbTiO3 (PMN-PYbN-PT) based piezoceramics were studied. Fully pervskite and 98% dense 0,2875PMN-0,2875PYbN-0,425PT ceramics modified with 1 mol% MnCO3 were fabricated after sintering at 1100˚C. ε_33^T/ ε_0 = 1728, tanδ = %0,35, d33 = 320 pC/N, d31 = -103 pC/N, Qm = 467, kp = 40%, k31 = 24%, k33 = 49% and Tc = 275˚C were measured. However, undoped ceramics sintered at 1000˚C had ε_33^T/ ε_0 = 2380, tanδ = %1,95, d33 = 433 pC/N, d31 = -145 pC/N, Qm = 60, kp = 43%, k31 = 27%, k33 = 48% and Tc = 280˚C. The addition of Mn resulted in decreasing tanδ and increasing Qm. Acceptor Mn^2+/Mn^3+ ions presumably substituted B-site ions in the center of oxygen octahedral of perovskite structure; therefore, some defect dipole pairs were formed. The electrically “hard” character were induced as a result of the domain wall motoin pinning due to the existing defect pairs, which resulted in decreased dielectric and mechanical losses. In summary, Mn doped 0,2875PMN-0,2875PYbN-0,425PT piezoceramics with “hard” character are good potential for device applications working under heavy electrical and mechanical stresses.
