Investigation and production of high purity lanthanum and barium hexaaluminate ceramic powders

This study presents synthesis of Lanthanum Hexaaluminate (LHA: LaAl11O18) and Barium Hexaaluminate (BHA: BaAl12O19) with co-precipitation (CP), wet impregnation (W) and solid-state routes with different sintering profiles and carbon templating route. The effect of different synthesis methods and pro...

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Bibliographic Details
Published inOpen ceramics Vol. 16; p. 100491
Main Author Seyidoglu, Tijen
Format Journal Article
LanguageEnglish
Published Elsevier 01.12.2023
Subjects
Barium
BET surface area
Hexaaluminates
High purity
Lanthanum
Rietveld refinement
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Summary:This study presents synthesis of Lanthanum Hexaaluminate (LHA: LaAl11O18) and Barium Hexaaluminate (BHA: BaAl12O19) with co-precipitation (CP), wet impregnation (W) and solid-state routes with different sintering profiles and carbon templating route. The effect of different synthesis methods and process parameters was investigated on the % of hexaaluminate phase formation confirmed by XRD-Rietveld Refinement and BET surface area measurements with N2 physisorption. LHA with high purity of 95% was successfully prepared confirmed by Rietveld refinement of XRD analysis with a BET surface area of 2 m2/g through co-precipitation (CP) method when the powder was sintered at 1600 °C. Carbon templating increased the surface area to 50 m2/g at a sintering temperature of 1200 °C with a lower LHA content of 77%. It was observed that BHA could be formed at lower temperatures, at 1400 °C, compared to LHA.
ISSN:2666-5395
2666-5395
DOI:10.1016/j.oceram.2023.100491