Abstract
Synthetic nickel–iron olivines, equilibrated at 1000°C, were investigated by means of Mössbauer spectroscopy at high and low temperature. A strong tendency towards an ordering of Ni2+ into the M1 site and Fe2+ into M2 was observed. KD for the exchange reaction Ni2+(M1) + Fe2 (M2) ⇄ Fe2+(M1) + Ni2+(M2) varies little with chemical composition, suggesting a near ideal solid solution in Ni–Fe olivines. Gibbs free energy of exchange at 1000°C is calculated to be 6.0 kcal/mole (24.9 kJ/mole).
This content is PDF only. Please click on the PDF icon to access.
You do not have access to this content, please speak to your institutional administrator if you feel you should have access.