Conically shaped single-crystalline diamond backing plates for a diamond anvil cell

摘要

Based on computer-aided design (CAD) and finite-element calculations (FEM), single-crystalline diamond backing plates were tailored as a replacement of beryllium for high-pressure diamond anvil cells with a focus on in-house single-crystal experiments. Although the modified cell has an opening angle of 90 deg, a very homogeneous stress distribution all over the backing plate was realized to avoid failure. The conically shaped backing plates work well in the targeted pressure range up to approx10 GPa using diamond anvils with 0.6 mm culet diameter. This is shown by a compressibility study of the complex intermetallic alloy Mg_(2)Co_(3)Sn_(10.15) up to 9.69 GPa. The influence of simultaneous diffraction phenomena in the diamonds (diamond dips) is illustrated by single-counter and area-detector measurements using standard laboratory equipment.