Autor:	J. Ovenstone, Jack Silver, Dominic A. Davies, J. O. Romani
Rok vydání:	2003
Předmět:	Calcite Anatase Chemistry Mechanical Engineering Aragonite Inorganic chemistry Nucleation engineering.material Hydrothermal circulation chemistry.chemical_compound Calcium carbonate Mechanics of Materials engineering Hydrothermal synthesis Carbonate General Materials Science
Zdroj:	Journal of Materials Science. 38:2743-2746
ISSN:	0022-2461
DOI:	10.1023/a:1024411424830
Popis:	It is shown that control of the phase of calcium carbonate produced during hydrothermal crystallisation can be achieved by the use of titania as a catalyst. In this work it was demonstrated that if either amorphous or the rutile phase of titania is added the aragonite polymorph of calcium carbonate is produced to the exclusion of all other phases. When anatase is the major titania form present then the calcite phase of calcium carbonate is favoured though some aragonite is still produced. The selectivity towards calcite is enhanced by increasing the hydrothermal processing temperature from 120°C to 135°C. It is suggested that the titania phase present catalyses the crystallisation by providing nucleation sites for the calcium carbonate to grow from.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::302e12c0d117fa440edd6b54245fa17c https://doi.org/10.1023/a:1024411424830 Zobrazit plný text záznamu Plný text ve formátu PDF