The La2O3 Doping Effects on the Characteristics of (1-x)Pb(Fe2/3W1/3)O3-PbTiO3 Relaxor Ferroelectric Ceramics

• Main Authors: Chi- Cheng Hsu, 徐嘉誠
• Other Authors: Sheng-Yuan Chu
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/92793085191523630219

碩士 === 國立成功大學 === 電機工程學系碩博士班 === 96 === 0.7Pb(Fe2/3W1/3)O3(PFW)-0.3PbTiO3(PT) is one of the classic relaxors with little diffuse-phase-transition(DPT) in normal temperature and lots of dielectric loss caused by space charge appearance. In present work, the 0.7PFW-0.3PT relaxor is synthesized with the conventional solid solution. To decrease the dielectric loss and make the dielectric diffusion property increases we doped the dopant La2O3 for the 0.7PFW-0.3PT. Although, the broader peak dielectric constant is obtained as doping La2O3, the curie point moves to lower temperature. According to the experimental results, the very lower dielectric loss is observed as doping 5at% La2O3. The smoothest dielectric constant in the normal temperature range is obtained between x=0.3 to 0.4 in (1-x)PFW-xPT doped the 5at% dopant La2O3. To discuss dielectric loss and DPT in different ratio Pb(0.95)La0.05(Fe2/3W1/3)0.65Ti0.35O3 prepared by ball-milled method in two steps and direct method also in this present work .