Abstract
We performed planar impact experiments with in-material manganin gauges in order to record the multiple wave structure resulting from the BiI-II and BiII-III phase transformations. Our values are somewhat higher than the static values (28 kbar for BiI-II and 32.5 kbar for BiII-III) but they agree with other dynamic measurements. The release portion of the stress signal shows a complicated structure which results from the multiplicity of waves in the target and their interactions. Our measured wave amplitudes and Lagrangian velocities are in good agreement with those obtained by free-surface velocity measurements, thus demonstrating the usefulness of manganin gauges in planar impact experiments.
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