Pressure, stress, and strain distribution in the double-stage diamond anvil cell

TL;DR

This study investigates pressure, stress, and strain distributions in double-stage diamond anvil cells using synchrotron x-ray diffraction, demonstrating the ability to reach high pressures without damaging the primary anvils.

Contribution

The paper presents a novel experimental setup with CVD microanvils and evaluates pressure limits and stress distributions in double-stage DACs.

Findings

Maximum pressure of 240 GPa achieved

Stress fields are typical of conventional DAC experiments

High pressures can be reached without damaging primary anvils

Abstract

Double stage diamond anvil cells (DAC) of two designs have been assembled and tested. We used a standard symmetric DAC as a primary stage and CVD microanvils machined by a focused ion beam - as a second. We evaluated pressure, stress, and strain distributions in Au and Fe-Au samples as well as in secondary anvils using synchrotron x-ray diffraction with a micro-focused beam. A maximum pressure of 240 GPa was reached independent of the first stage anvil culet size. We found that the stress field generated by the second stage anvils is typical of conventional DAC experiments. The maximum pressures reached are limited by strains developing in the secondary anvil and by cupping of the first stage diamond anvil in the presented experimental designs. Also, our experiments show that pressures of several megabars may be reached without sacrificing the first stage diamond anvils.