Abstract
The development of the diamond-anvil-cell technology has enabled us to conduct in situ experiments at ultrahigh pressures. The current pressure limit reaches well beyond 200 GPa. The stress environment in such experiments is in general highly nonhydrostatic, and one has to be careful in evaluating the obtained data. Nonhydrostaticity affects the phase stability, transition pressures, equation of state, and various lattice properties. For detailed discussion of the change in physical properties with pressure, we have to realize hydrostatic or quasihydrostatic conditions. I describe our present understanding of the stress state of a sample compressed in a diamond-anvil cell, together with recent efforts for extending the pressure limit of hydrostatic experiments.
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