Advanced search
Start date
Betweenand
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Preparation of dense La0.9Sr0.1Ga0.8Mg0.2O3-delta with high ionic conductivity by solid-state synthesis

Full text
Author(s):
Reis, S. L. [1] ; Muccillo, E. N. S. [1]
Total Authors: 2
Affiliation:
[1] Energy & Nucl Res Inst IPEN, POB 11049, BR-05422970 Sao Paulo, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: IONICS; v. 24, n. 6, p. 1693-1700, JUN 2018.
Web of Science Citations: 2
Abstract

The results of a systematic investigation on the effects of processing steps, via solid-state reactions, on structural phase characteristics and ionic conductivity of La0.9Sr0.1Ga0.8Mg0.2O3-delta solid electrolyte are reported. The main purpose of this work is to establish an optimized route for obtaining good densification and high ionic conductivity of this solid electrolyte. Processing routes with three successive calcinations at 1250 degrees C followed by attrition milling (R1), and with two sequences of calcination at 1350 degrees C with intermediary attrition milling (R2) give rise to near full density at 1450 degrees C sintering temperature. The rate of grain growth is fast when the relative density reaches 95%. Elemental mapping reveals uniform distribution of the constituents in the matrix along with La4Ga2O9, LaSrGa3O7 and sub-micrometer MgO grains at grain boundaries. The ionic conductivity of grains remains unchanged with the processing route and sintering profile. The blocking effect of charge carriers at grain boundaries decreases with increasing the dwell temperature. (AU)

FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
Grantee:Elson Longo da Silva
Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC