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Control and monitoring of oxygen fugacity in piston cylinder experiments

DOI: 10.1007/s00410-015-1105-z DOI Help

Authors: Vladimir Matjuschkin (University of Bristol) , Richard A. Brooker (University of Bristol) , Brian Tattitch (University of Bristol) , Jonathan Blundy (University of Bristol) , Charlotte Stamper (University of Bristol)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Contributions To Mineralogy And Petrology , VOL 169 (1) , PAGES 9

State: Published (Approved)
Published: January 2015
Diamond Proposal Number(s): 8203 , 9597

Abstract: We present a newly developed capsule design that resolves some common problems associated with the moni- toring and control of oxygen fugacity (fO2) in high-pressure piston cylinder experiments. The new fO2 control assem- bly consists of an AuPd outer capsule enclosing two inner capsules: one of AuPd capsule containing the experimental charge (including some water), and the other of Pt containing a solid oxygen buffer plus water. The inner capsules are sepa- rated by crushable alumina. The outer capsule is surrounded by a Pyrex sleeve to simultaneously minimise hydrogen loss from the cell and carbon infiltration from the graphite fur- nace. Controlled fO2 experiments using this cell design were carried out at 1.0 GPa and 1,000 °C. We used NiPd, CoPd and (Ni, Mg)O fO2 sensors, whose pressure sensitivity is well cal- ibrated, to monitor the redox states achieved in experiments buffered by Re–ReO2, Ni–NiO and Co–CoO, respectively. Results for the fO2 sensors are in good agreement with the intended fO2 established by the buffer, demonstrating excel- lent control for durations of 24–48 h, with uncertainties less than ± 0.3 log bar units of fO2.

Subject Areas: Earth Science, Materials, Chemistry

Instruments: I18-Microfocus Spectroscopy

Other Facilities: No

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