Phase structure and electrical properties of 0.8Pb(Mg1/3Nb2/3)O3–0.2PbTiO3 relaxor ferroelectric ceramics prepared by the reaction-sintering method

✍ Scribed by Chenlu Ding; Bijun Fang; Qingbo Du; Limin Zhou

• Publisher: John Wiley and Sons
• Year: 2009
• Tongue: English
• Weight: 805 KB
• Volume: 207
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/pssa.200925377

✦ Synopsis

Abstract

Phase pure perovskite 0.8Pb(Mg~1/3~Nb~2/3~)O~3~–0.2PbTiO~3~ (0.8PMN–0.2PT) ferroelectric (FE) ceramics were prepared by the reaction‐sintering method at a sintering temperature range of 1200–1250 °C. The sintered ceramics exhibit large relative density, where the 0.8PMN–0.2PT ceramics sintered at 1250 °C possess the largest value of relative density, reaching 99.56% of the theoretical density. All the sintered 0.8PMN–0.2PT ceramics exhibit broad, diffused, and frequency‐dependent dielectric response peaks at around 80 °C and saturated and symmetric P–E hysteresis loops. The 0.8PMN–0.2PT ceramics exhibit excellent electrical properties, where the value of dielectric constant maximum ε~m~ is 35 750 at 1 kHz, the remanent polarization P~r~ is 33.01 µC/cm^2^, the coercive field E~c~ is 2.79 kV/cm, and the piezoelectric constant d~33~ is 259 pC/N.