Free energy of formation of barium ferrites

Abstract

The free energy of formation (AG°) of various ferrites in the system BaO-Fe2O3 was determined with galvanic cells using barium fluoride as solid electrolyte. The values of ΔG° per mole of 2 BaO · Fe2O3, BaO · Fe2O3 and BaO · 6 Fe2O3 from BaO and Fe2O3 were found to be-10,953 (±2275) J, -68,496 (±435) J, -75,576 (±250) J at 1200 K and-104,600 (±2275) J, -66,875 (±435) J, -74,437 (±250) J at 1300 K respectively. © 1976 American Society for Metals, The Melallurgical Society of AIME.