Cation ordering in Ni-Fe olivines

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+(M...

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Bibliographic Details
Published inThe American mineralogist Vol. 67; no. 11-12; pp. 1212 - 1217
Main Authors Annersten, Hans, Ericsson, Tore, Filippidis, Anestis
Format Journal Article
LanguageEnglish
Published Mineralogical Society of America 01.12.1982
Subjects
cations
cell dimensions
crystal chemistry
experimental studies
ferrous iron
free energy
ion exchange
iron
metals
mineral data
Mineralogy
minerals
N2SiO4-Fe2SiO4
nesosilicates
Ni-Fe olivine
nickel
olivine
olivine group
order-disorder
orthosilicates
phase equilibria
silicates
solid solution
synthetic materials
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Summary: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).—Journal abstract.
ISSN:0003-004X
1945-3027