Effects of WO3 on the microstructure and optical transmittance of PLZT ferroelectric ceramics

✍ Scribed by Robson Favaretto; Ducinei Garcia; José Antonio Eiras

• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 597 KB
• Volume: 27
• Category: Article
• ISSN: 0955-2219
• DOI: 10.1016/j.jeurceramsoc.2007.02.172

✦ Synopsis

The influence of the WO 3 addition as sintering aids on the structural, microstructural and optical properties of (Pb,La)(Zr,Ti)O 3 -PLZT based ceramics was investigated. Ferroelectric (Pb 0.9 La 0.1 )(Zr 0.65 Ti 0.35 ) 0.975 O 3 + x wt% WO 3 (x = 0.0, 0.5, 1.5 and 2.0) ceramics were densified by oxygen assisted uniaxial hot pressing. From the XRD results it was found that the hot pressed samples displayed single pseudocubic perovskite phase. EDS analysis evidenced the presence of WO 3 rich phase at the grain boundaries. An inhibition of grain growth and an evolution from transgranular to intergranular fracture behavior was observed, as a consequence of the formation of a PbO-WO 3 liquid phase, as the amount of WO 3 addition was increased. The optical transmittance in the visible and infrared range was decreased due to the presence of the liquid phase in grain boundaries, for WO 3 content lower than 2.0 wt%.