Reactive flash sintering of the complex oxide Li0.5La0.5TiO3 starting from an amorphous precursor powder

Author(s)

Avila, Viviana ^[1] ; Yoon, Bola ^[1] ; Ingraci Neto, Rubens R. ^[1] ; Silva, Ronaldo S. ^[2] ; Ghose, Sanjit ^[3] ; Raj, Rishi ^[1] ; Jesus, Lilian M. ^{[1, 4]}

Affiliation

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

^[2] Univ Fed Sergipe, Dept Phys, Grp Funct Nanomat, BR-49100000 Sao Cristovao, SE - Brazil

^[3] Brookhaven Natl Lab, Natl Synchrotron Light Source 2, Upton, NY 11973 - USA

^[4] Fed Univ Sao Carlos UFSCar, Dept Phys, Grp Adv Funct Mat, BR-13565905 Sao Carlos, SP - Brazil

• Document type: Journal article
• Source: SCRIPTA MATERIALIA; v. 176, p. 78-82, FEB 2020.
• Web of Science Citations: 5

Abstract

We report the transformation of an amorphous mixture of Li0.5La0.5TiO3 (LLTO) directly into a single phase dense polycrystal, all within a few seconds at about 800 degrees C by the flash method. The starting material is a chemically-prepared precursor powder that experiences concurrent crystallization and densification to cubic LLTO during the flash event, as shown by in-situ X-ray measurements. The experiments were conducted at a constant heating rate with fields from 80 to 120V cm(-1) and a current limit of 60 mA mm(-2). The resulting polycrystal yielded a bulk conductivity of 0.5 mS cm(-1). (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. (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