Thermodynamic restrictions on mechanosynthesis of strontium titanate
authors Monteiro, JF; Ferreira, AAL; Antunes, I; Fagg, DP; Frade, JR
nationality International
journal JOURNAL OF SOLID STATE CHEMISTRY
author keywords Mechanochemistry; Mechanosynthesis; Strontium titanate; Chemical potential phase stability diagrams
keywords MECHANOCHEMICAL SYNTHESIS; MECHANICAL ACTIVATION; AB-INITIO; VARIABLE-TEMPERATURE; CALCIUM TITANATE; POWDERS; BATIO3; CATIO3; MIXTURES; ANATASE
abstract Chemical potential phase stability diagrams were calculated from relevant thermodynamic properties and used to predict the thermodynamic driving force under prospective conditions of room temperature mechanosynthesis. One analysed the dependence of chemical potential diagrams on temperature and partial pressure of evolving gases such as oxygen or carbon dioxide, as expected on using strontium peroxide or strontium carbonate as precursor reactants for the alkali earth component. Thermodynamic calculations were also obtained for changes in titania precursor reactants, including thermodynamic predictions for reactivity of strontium carbonate with amorphous titania. Experimental evidence showed that strontium titanate can be obtained by mechanosynthesis of strontium carbonate+ anatase mixtures, due to previous amorphization under high energy milling. Ability to perform mechanosynthesis with less energetic milling depends on the suitable choice of alternative precursor reactants, which meet the thermodynamic requirements without previous amorphization; this was demonstrated by mechanosynthesis from anatase + strontium peroxide mixtures. (C) 2011 Elsevier Inc. All rights reserved.
publisher ACADEMIC PRESS INC ELSEVIER SCIENCE
issn 0022-4596
year published 2012
volume 185
beginning page 143
ending page 149
digital object identifier (doi) 10.1016/j.jssc.2011.10.044
web of science category Chemistry, Inorganic & Nuclear; Chemistry, Physical
subject category Chemistry
unique article identifier WOS:000298937000022
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