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friction measurements in piston-cylinder apparatus using quartz-coesite reversible transitionThe value of friction determined by monitoring piston displacement as a function of nominal pressure on compression and decompression cycles at 1273 K is compared with the friction value obtained by reversing the quartz-coesite transition at 1273 and 1073 K in a talc-glass-alsimag cell (Akella and Kennedy, 1971) and a low-friction salt cell (Mirwald et al., 1975). Quenching runs at 1273 K gave double values of friction of 0.25 GPa for the talc-glass-alsimag cell and 0.03 GPa for the salt cell. The piston-displacement technique gave somewhat higher values. Use of piston-displacement hysteresis loops in evaluating the actual pressure on a sample may lead to overestimates for decompression runs and underestimates for compression runs.
Document ID
19790061047
Document Type
Conference Proceedings
Authors
Akella, J.
(California, University Lawrence Livermore Laboratory, Livermore, Calif., United States)
Date Acquired
August 9, 2013
Publication Date
January 1, 1979
Subject Category
ENGINEERING (GENERAL)
Meeting Information
High-pressure science and technology; Sixth International Conference(Boulder, CO)
Funding Number(s)
CONTRACT_GRANT: NSR-09-051-001
Distribution Limits
Public
Copyright
Other