Experimental test of rate equations: time evolution of Al,Si ordering in anorthite CaAl2Si2O8

Autor:	Michael A. Carpenter, Ann Graeme-Barber, B. Wruck, Ekhard K. H. Salje
Rok vydání:	1993
Předmět:	chemistry.chemical_classification Condensed matter physics Chemistry Time evolution Thermodynamics Rate equation engineering.material Condensed Matter Physics Anorthite Kinetic energy Landau theory engineering General Materials Science Ising model Glauber Inorganic compound
Zdroj:	Journal of Physics: Condensed Matter. 5:2961-2968
ISSN:	1361-648X 0953-8984
DOI:	10.1088/0953-8984/5/18/018
Popis:	The kinetic and equilibrium behaviour of the order parameter, Qod, of Al,Si ordering in anorthite has been compared with the results of current rate theories (Ising-type Glauber, Ising-type Kawasaki and Landau-type rate equations). Although all rate equations can be adjusted to fit the time evolution for an accessible small interval of Qod(t) between 0.76 and 0.88, significant systematic differences were found for the equilibrium behaviour Qod(T). Qod(T) is well described by Landau theory but not by Bragg-Williams equations. The rate laws are rather model-independent for Qod>0.76, but significant differences are expected for the ordering behaviour of crystals with smaller values of Qod (e.g.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::540f4cf259ee38dc06fc42a065380f7a https://doi.org/10.1088/0953-8984/5/18/018 Zobrazit plný text záznamu