Microstructural, structural and electrical properties of La3+-modified Bi4Ti3O12 ferroelectric ceramics

✍ Scribed by V.B. Santos; J.-C. M’Peko; M. Mir; V.R. Mastelaro; A.C. Hernandes

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 754 KB
• Volume: 29
• Category: Article
• ISSN: 0955-2219
• DOI: 10.1016/j.jeurceramsoc.2008.06.025

✦ Synopsis

Bi 4-x La x Ti 3 O 12 (BLT) ceramics were prepared and studied in this work in terms of La 3+ -modified microstructure and phase development as well as electrical response. According to the results processed from X-ray diffraction and electrical measurements, the solubility limit (x L ) of La 3+ into the Bi 4 Ti 3 O 12 (BIT) matrix was here found to locate slightly above x = 1.5. Further, La 3+ had the effect of reducing the material grain size, while changing its morphology from the plate-like form, typical of BIT ceramics, to a spherical-like one. The electrical results presented and discussed here also include the behavior of the temperature of the ferroelectric-paraelectric phase transition as well as the normal or diffuse and/or relaxor nature of this transition depending on the La 3+ content.