Abstract
α-Co2SiO4 (Co-olivine) and α-Ni2SiO4 (Ni-olivine) can form a continuous series of substitutional solid solutions, in which the b-axis shows the largest expansion after substitution of Co2+ for Ni2+. The linear composition dependences for lattice parameters and vibrational frequencies suggest that the mixing of α-Co2SiO4 and α-Ni2SiO4 are nearly ideal, and both Co2+ and Ni2+ in the (Co, Ni)2SiO4 solid solutions distribute randomly over the M1 and M2 sites. Addition of Co2+ into α-Ni2SiO4 has significantly weakened the Raman intensity of the system. Together with other transition-metal silicate olivines, the frequencies of the lattice Raman modes appear to have a systematic variation with radius and crystal field stabilization energy of cation in the olivine structure, while the same trend has not been observed in the internal modes of SiO4.
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