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Clinopyroxenes along the aegrine – diopside join have been synthesized from flux growth and high pressure experiments. Samples were characterized by  57 Fe Mössbauer spectroscopy and single crystal X-ray diffraction. Coordination, bond lenghts and – angles and polyhedral distortion parameters are discussed as a function of composition. All samples exhibit  C 2/ c  space group symmetry and show smooth variation of structural parameters with chemistry. While the lattice parameters   a   and   b   increase with increasing diopside component,   c   decreases, even if the smaller Fe 3+  cation is replaced by the larger Mg 2+  one. A distinctly decreasing M1—M1 cationic distance within the octahedral chain from aegirine to diopside suggests, that decreasing repulsive forces between M1 catäions with decreasing charge of the M1 cation is responsible for this behaviour. In  57 Fe Mössbauer spectroscopy, small amount of Fe 2+  were detected in the samples of the high pressure experiments. The quadrupole splitting of both, Fe 2+  and Fe 3+  suggests an increasing distortion of the Fe-octahedra with increasing diopside content, while the overall distortion of the M1 sites decrease. This shows that local structural units may behave quite differently as compared to the average structure.

zeitschrift für kristallographie. crystalline materials

Structural and  57 Fe Mössbauer spectroscopic characterization of the synthetic NaFeSi 2 O 6  (aegirine) – CaMgSi 2 O 6  (diopside) solid solution series