Unit cell dimensions of some synthetic olivine group solid solutions

Abstract

Two series of solid solutions of olivine structure, (Mg, Co)2SiO4, and (Mg, Ni)2Sio4, were synthesized at l, 400°C, and their unit cell parameters were measured at room temperature. It was found that deviations from Vegard's law increase according to the order (Mg, Fe)2Sio4. (Mg, Co)2Sio4 and (Mg, Ni)2Sio4. This order coincides with the order of octahedral crystal field stabilization energies of transition metal ions. It was suggested that the site preference of Mg and transition metal ions over MI and MII sites is most pronounced in the case of (Mg, Ni)2Sio4 solid solution series. © 1968, GEOCHEMICAL SOCIETY OF JAPAN. All rights reserved.