Preparation and characterization of perovskite ceramic powders by gelcasting

Huanting Wang, Song Xie, Wei Lai, Xingqin Liu, Chusheng Chen, Guangyao Meng

Research output: Contribution to journalArticleResearchpeer-review

12 Citations (Scopus)

Abstract

Perovskite La0.6Sr0.4Co0.8Fe0.2O3-δ (LSCF) powders have been successfully synthesized from oxide and carbonates based on the principle of gelcasting. Phase-forming temperature is very dependent on the ball-milling process during the suspension preparation. As the ball-milling time is increased, the temperature of phase formation decreases, therefore the perovskite powder obtained has a larger Brunaver-Emmett-Teller (BET) specific surface area. The grain sizes were around 1 μm at 1000°C and 2 μm at 1100°C from scanning electron microscopy (SEM) photographs. The perovskite powders have good sinterability: the sintering densities of ceramic bodies shaped with as-prepared powders were investigated. SEM photos show that sintered ceramics exhibit a well defined morphology in the packing and sintering of particles. The oxygen permeance of disc shaped samples, with a thickness ranging from 1.02 to 1.98 mm was 6.39 × 10-8-1.99 × 10-8 mol cm-2 s-1 at 900°C indicating that LSCF ceramics have high oxygen permeation. It can be concluded that gelcasting is a simple and effective method for preparing practical multicomponent perovskite powders.

Original languageEnglish
Pages (from-to)1163-1167
Number of pages5
JournalJournal of Materials Science
Volume34
Issue number6
DOIs
Publication statusPublished - 1 Mar 1999
Externally publishedYes

Cite this