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Heat of immersion of iron(III) oxides in water at 25°C

Authors
Journal
Thermochimica Acta
0040-6031
Publisher
Elsevier
Publication Date
Volume
56
Issue
1
Identifiers
DOI: 10.1016/0040-6031(82)80069-5

Abstract

Abstract The heat of immersion in water was measured at 25°C for three iron(III) oxides using a twin-type microcalorimeter. One of the samples was commercial α-Fe 2O 3 (sample C) and the other two (samples M and F) were prepared by calcining magnetite and iron(III) hydroxide in air at various temperatures, T p, from 300 to 700°C. The samples were evacuated at outgassing temperature, T o, between room temperature and 500°C at a pressure of 1 × 10 −2−2.7 × 10 −2N m −2 for 6 h. The heat of immersion, h i (J m −2), of samples C and M increased with an increase in T o and showed the maximum h i at T o =400°C, while sample F did not show the maximum up to T o =500°C. The systematic correlation was not observed between h i and T p of sample F. The heat of reproduction of the surface hydroxyl group on sample F was approximately estimated as 6.6 × 10 4 J mole −1 H 2O.

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