synthetic Fe3+-bearing beryl

What is it about?

The synthetic hydrothermal beryl Fe-4-51 studied here is a nearly pure Fe3+-bearing one. Its Mössbauer spectrum of is represented by a broad disordered pattern, from which the Mössbauer parameters can roughly be estimated as IS = 0.34 mm/s and QS = 0.71 mm/s. From the optical absorption spectrum of Fe3+, the crystal field strength Dq is derived to be ~1520 cm-1 and the values of Racah parameters of interelectronic repulsion B and C, as 665 cm-1 and 3415 cm-1, respectively. A rather low B-value, comparing with that of free Fe3+ ion, 814 cm-1 (e.g., Manning 1970), suggests a relatively high degree of covalency in the octahedral Fe3+ - O bond.

Featured Image