Abstract
Abstract Measurements of stress pulses induced in pyrolytic graphite samples by a pulsed electron beam and monitored by an optical interferometer technique are described. The method yields values of Gruneisen tensor components and longitudinal elastic wave speeds for the heated material. Results for a highly-aligned compression-annealed pyrolytic graphite are reported as well as measurements for two as-deposited pyrolytic graphites with broader distributions of crystallite angular orientations. The compression-annealed graphite results are the first direct Gruneisen parameter measurements reported for a highly-ordered graphite material. These data are compared, where possible, with the results of other measurements. The preferred orientation model is used to predict properties of materials with various crystallite distributions by using single-crystal elastic constant and thermal data. Qualitative agreement is obtained between measured and calculated properties as a function of crystallite alignment.
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