We describe a new methodology to collect energy domain Mössbauer spectra of inclusions in natural diamonds using a Synchrotron Mössbauer Source (SMS). Measurements were carried out at the Nuclear Resonance beamline ID18 at the European Synchrotron Radiation Facility (Grenoble, France). We applied this non-destructive approach to collect SMS spectra of a ferropericlase inclusion still contained within its diamond host from Juina (Brazil). The high spatial resolution of the measurement (~ 15 μm) enabled multiple regions of the 190 × 105 μm2 inclusion to be sampled and showed that while Fe3 +/Fetot values in ferropericlase were below the detection limit (0.02) overall, there was a magnetic component whose abundance varied systematically across the inclusion. Hyperfine parameters of the magnetic component are consistent with magnesioferrite, and the absence of superparamagnetism allows the minimum particle size to be estimated as ~ 30 nm. Bulk Fe3 +/Fetot values are similar to those reported for other ferropericlase inclusions from Juina, and their variation across the inclusion can provide constraints on its history.

Nestola, F., Cerantola, V., Milani, S., Anzolini, C., Mccammon, C., Novella, D., et al. (2016). Synchrotron Mossbauer Source technique for in situ measurement of iron-bearing inclusions in natural diamonds. LITHOS, 265, 328-333 [10.1016/j.lithos.2016.06.016].

Synchrotron Mossbauer Source technique for in situ measurement of iron-bearing inclusions in natural diamonds

Cerantola V
Secondo
;
2016

Abstract

We describe a new methodology to collect energy domain Mössbauer spectra of inclusions in natural diamonds using a Synchrotron Mössbauer Source (SMS). Measurements were carried out at the Nuclear Resonance beamline ID18 at the European Synchrotron Radiation Facility (Grenoble, France). We applied this non-destructive approach to collect SMS spectra of a ferropericlase inclusion still contained within its diamond host from Juina (Brazil). The high spatial resolution of the measurement (~ 15 μm) enabled multiple regions of the 190 × 105 μm2 inclusion to be sampled and showed that while Fe3 +/Fetot values in ferropericlase were below the detection limit (0.02) overall, there was a magnetic component whose abundance varied systematically across the inclusion. Hyperfine parameters of the magnetic component are consistent with magnesioferrite, and the absence of superparamagnetism allows the minimum particle size to be estimated as ~ 30 nm. Bulk Fe3 +/Fetot values are similar to those reported for other ferropericlase inclusions from Juina, and their variation across the inclusion can provide constraints on its history.
Articolo in rivista - Articolo scientifico
Ferric iron; Ferropericlase; Magnesioferrite; Magnetism; Oxygen fugacity;
English
328
333
6
Nestola, F., Cerantola, V., Milani, S., Anzolini, C., Mccammon, C., Novella, D., et al. (2016). Synchrotron Mossbauer Source technique for in situ measurement of iron-bearing inclusions in natural diamonds. LITHOS, 265, 328-333 [10.1016/j.lithos.2016.06.016].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/397754
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