Electric field-assisted flash sintering of Bi2/3Cu3Ti4O12 starting from a multi-phase precursor powder

Author(s)

Jesus, L. M. ^{[1, 2]} ; Silva, R. S. ^[3] ; Raj, R. ^[1] ; M'peko, J-C ^[4]

Affiliation

^[1] Univ Colorado, Dept Mech Engn, Mat Sci & Engn Program, Boulder, CO 80309 - USA

^[2] Fed Univ Sao Carlos UFSCar, Dept Phys, Grp Adv Funct Mat MAFA, BR-13565905 Sao Carlos, SP - Brazil

^[3] Univ Fed Sergipe, Dept Phys, Grp Funct Nanomat, BR-49100000 Sao Cristovao, SE - Brazil

^[4] Univ Sao Paulo, Sao Carlos Inst Phys, POB 369, BR-13560970 Sao Carlos, SP - Brazil

• Document type: Journal article
• Source: Journal of the European Ceramic Society; v. 40, n. 12, p. 4004-4009, SEP 2020.
• Web of Science Citations: 0

Abstract

We show that powders of bismuth titanate, copper oxide, and titanium oxide can be transformed into a single Bi2/3Cu3Ti4O12 phase and subsequently flash sintered at furnace temperatures of 855 - 910 degrees C in a single running experiment, with an electric field ranging from 5 to 15 V cm(-1) and a current limit of 53 mA mm(-2). The (di) electrical properties of the flashed materials were assessed by impedance spectroscopy. These ceramics show a giant dielectric constant (epsilon' > 10(4)), and an increasing resistivity with raising the field used in the flash, reaching a value as high as 6.7 M Omega cm for 15 V cm(-1). Thus, the one-step experiment process described here greatly simplifies the fabrication of high-density single-phase ceramics of this material while at the same time improving its properties for low leakage high dielectric applications. (AU)

• FAPESP's process: 18/19370-6 - Electric-Field Assisted Processing of Electroceramics: (micro)structural characteristics and dielectric properties
• Grantee: Lilian Menezes de Jesus
• Support Opportunities: Scholarships abroad - Research