Polyhedral Bulk Moduli From High-Pressure Crystal Field Spectra
- Murli H. Manghnani and
- Yasuhiko Syono
Published Online: 21 MAR 2013
Copyright © 1987 by Terra Scientific Publishing Company (TERRAPUB), Tokyo.
High-Pressure Research in Mineral Physics: A Volume in Honor of Syun-iti Akimoto
How to Cite
Burns, R. G. (2013) Polyhedral Bulk Moduli From High-Pressure Crystal Field Spectra, in High-Pressure Research in Mineral Physics: A Volume in Honor of Syun-iti Akimoto (eds M. H. Manghnani and Y. Syono), American Geophysical Union, Washington, D. C.. doi: 10.1029/GM039p0361
- Published Online: 21 MAR 2013
- Published Print: 1 JAN 1987
Print ISBN: 9780875900667
Online ISBN: 9781118664124
- Mineralogy and Crystal Chemistry;
- Phase transformations;
- High Pressure-High Temperature Research
A modified Birch-Murnaghan equation of state, K l, 0 = (2/3)P [(Δ p /Δ0)7/5 − (Δ p /Δ0)]−1 is used to evaluate zero-pressure polyhedral bulk moduli, K l, 0, for transition metal-bearing coordination polyhedra from pressure-induced variations of the crystal field splitting parameter, Δ, obtained from visible-near infrared spectral measurements of oxides and silicates. The K l, 0 values generally agree with polyhedral bulk moduli derived from high-pressure X-ray data. The spectral method for evaluating polyhedral bulk moduli is best suited to cubic (isometric) phases containing transition metals in regular, or only slightly distorted, octahedral or cubic (8-fold) environments. Such coordination polyhedra occur in garnet, spinel, periclase, and perovskite structure-types in the mantle.