A new molten salt cell for precision stress measurement at high pressure
Green, Harry W.; Borch, Robert S.
European Journal of Mineralogy Volume 1 Number 2 (1989), p. 213 - 220
published: May 3, 1989
manuscript accepted: Sep 2, 1988
manuscript received: Apr 9, 1988
ArtNo. ESP147050102006, Price: 29.00 €
Abstract Deformation experiments at high temperature are of importance for understanding the natural flow of rocks. One parameter that is important for extrapolation to natural conditions, especially for mantle rocks, is the pressure dependence but collection of high quality data at pressures greater than a few hundred MPa has not been possible previously. To address this problem, we have developed a new sample assembly for the Griggs solid-medium deformation apparatus, in which specimens are surrounded by molten salt. The data collected with this assembly are of much higher accuracy and precision than previously possible in this type of apparatus ; the scatter of data is comparable to that reported in similar studies in gas-medium apparatus. The results of the first study utilizing this cell span the range of 0.6-3.2 GPa pressure and 1 100-1 700 K. These data allow measurement of the friction on the moving piston within the high pressure volume and show that this friction within the standard solid-medium cell can represent a significant fraction of the apparent strength of the material.