Free Energy of Iron Oxides .JOHN
C€ilP#IN AND
DONAIDw. b1ulWiiY. k:niversily of Michigan, Ann Arbor, L l i d i .
7'lre uppliculioii of thermodyrulmics to problems of sled mariufacture is discussed, and the de-
sirabilily of obtaining a complete table of free energies ut steel-making lemperutures is shown. Dala on /he thermal properlies of iron are reviewed, und from these are derived equatioris for the free energy of the various forms of iron referred to beta iron ( I S u contrenieril reference state. The d u h on lhe heat capacities of ferric oxide and ntagrrelile are reviewed and empirical equalioru drrii:ed. An approximate expression for .ierrorr.
