Internally heated gas pressure vessel (IHPV) with H2-control
Both vessels (WHITE and GREEN) are equipped with a Shaw-membrane to monitor the internal H2 pressure; a rapid quench device allows cooling rates of ~150°C/s. An Ar-H2 mixture is used as pressure medium to adjust redox conditions inside the vessel. One vessel (WHITE) is equipped with a high-pressure low-flow metering valve to conduct decompression experiments with continuous decompression rates (~0.0002 to >10 MPa/s). The maximum heating rate is 80°C/min. The vessels are PC-operated (using itools) allowing e.g. to regulate the temperature path and logging of Ptotal, T, P(H2).
The vessels are used to perform high pressure-temperature experiments (850 to 1250°C; up to 500 MPa) at various redox conditions (log fO2 = FMQ+0 to FMQ+3) e.g. to investigate magmatic processes in earth’s crust or upper mantle and to synthesize high pressure materials. Decompression experiments can be conducted at geologically relevant P-T conditions to study degassing of volcanic systems.
Berndt, J., Liebske, C., Holtz, F., Freise, M., Nowak, M., Ziegenbein, D., Hurkuck, W., Koepke, J. (2002): A combined rapid-quench and H 2-membrane setup for internally heated pressure vessels: Description and application for water solubility in basaltic melts, American Mineralogist 87 (11-12) , pp. 1717-1726
Nowak, M., Cichy, S.B., Botcharnikov, R.E., Walker, N., Hurkuck, W. (2011): A new type of high-pressure low-flow metering valve for continuous decompression: First experimental results on degassing of rhyodacitic melts, American Mineralogist 96 (8-9) , pp. 1373-1380