UNSPECIFIED (2000) Effect of mechanochemical treatment on the synthesis of calcium dialuminate. JOURNAL OF MATERIALS CHEMISTRY, 10 (4). pp. 1019-1023. ISSN 0959-9428

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Abstract

Calcium dialuminate (CaAl4O7) powders were synthesised from mechanochemically treated mixtures of aluminium hydroxide + calcium hydroxide and aluminium hydroxide + calcium carbonate. On grinding, both mixtures produce X-ray amorphous precursor phases which show Al-27 MAS NMR resonances characteristic of Al in octahedral and tetrahedral sites, and a site identified by a resonance at 37-39 ppm (possibly pentahedral Al). Although grinding does not completely destroy the carbonate XRD reflections in the carbonate mixture, both precursors show a high degree of homogeneity and behave similarly on heating, forming monophase CaAl4O7 at < 1050 degrees C. By contrast, the same unground compositions form mixtures of alpha-alumina and various calcium aluminates (but not CaAl4O7) on heating as high as 1250 degrees C. Calcium dialuminate synthesised from the carbonate-containing mechanochemical precursor had a smaller particle size which may be advantageous for subsequent fabrication and sintering.

Item Type:	Journal Article
Subjects:	Q Science > QD Chemistry T Technology > TA Engineering (General). Civil engineering (General)
Journal or Publication Title:	JOURNAL OF MATERIALS CHEMISTRY
Publisher:	ROYAL SOC CHEMISTRY
ISSN:	0959-9428
Date:	2000
Volume:	10
Number:	4
Number of Pages:	5
Page Range:	pp. 1019-1023
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/13547

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