Stress Gradient in Solid Methane at High Pressures

Science  22 Nov 1968:
Vol. 162, Issue 3856, pp. 902-903
DOI: 10.1126/science.162.3856.902


The magnitude of the axial pressure gradient at 77°K (11 percent per centimeter) in solid methane compressed along one axis for applied pressures up to 10 kilobars was determined by comparing the electrical resistance of a pair of doped tellurium pressure gages with that of a set of single-crystal gages made of high-purity bismuth. The existence of the pressure gradient revealed the causes of deformation in metal tensile specimens embedded in solid methane and cycled to high pressure.