The knowledge of high-pressure behavior of LiH and deuterium is significant for the validation of fundamental theoretical models and applications in thermonuclear materials and potential energy supplies. The compressibility of LiH and deuterium under isentropic compression at high pressure was investigated experimentally.  The experimental technique for quasi-isentropic compression with low-density materials was developed using the magnetocumulative generator CJ-100 and x-ray flash radiography. Pressure in excess of 300GPa could be achieved for deuterium by ramp wave reverberation. The quasi-isentropic data point for LiH at 438 GPa was obtained experimentally. A semiempirical three-term complete equation of state was constructed and validated for LiH using the theory of Mie-Gruneisen-Debye with experimental data from the literature. The quasi-isentrope data point is reasonably consistent with the theoretical results. The quasi-isentropic experimental techniques and results broaden the existing research scope and are practical and helpful to further validate theoretical models in the future.
 

quasi-isentropic compression; magnetocumulative technique; high pressure; thermophysical path

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