Original paper
Fe3O4 activities in Fe-Ti spinel solid solutions
Woodland, Alan B.; Wood, Bernard J.
European Journal of Mineralogy Volume 6 Number 1 (1994), p. 23 - 38
52 references
published: Feb 3, 1994
manuscript accepted: Sep 29, 1993
manuscript received: Jan 21, 1993
DOI: 10.1127/ejm/6/1/0023
Abstract
Abstract The activity of Fe3O4 in Fe3O4-Fe2TiO4 solid solutions has been experimentally determined at 800 oC and 900 oC at 1 atm pressure. The activity-composition relations deviate markedly from "ideal" (a = X2) behavior, requiring consideration of Fe2+-Fe3+ order on the ulvöspinel-magnetite join. We have developed a solution model that takes explicit account of order-disorder and the measured activity-composition relations. The derived interaction parameters fit our activity-composition data together with other activity and cation distribution data available in the literature over the temperature range of 800-13002C
Keywords
titaniferous magnetite • electrochemical measurements • activity-composition relations • thermodynamics • cation ordering