Calibration of manganin pressure gauge for diamond-anvil cells

TL;DR

This paper introduces a manganin-based pressure gauge for diamond-anvil cells that enables continuous, reliable pressure calibration, especially useful for piezoelectric-driven DACs, enhancing high-pressure experimental capabilities.

Contribution

The study develops and validates a manganin resistivity-based pressure gauge for DACs, providing a linear, continuous calibration method suitable for programmable high-pressure experiments.

Findings

Manganin resistivity shows linear pressure dependence up to 30 GPa.

The gauge provides consistent calibration during initial compression and decompression cycles.

Verification with Bi pressure standard confirms reliability.

Abstract

Pressure calibration for most diamond-anvil cell (DAC) experiments is mainly based on the ruby scale, which is key to implement this powerful tool for high-pressure study. However, the ruby scale can often hardly be used for programmably-controlled DAC devices, especially the piezoelectric-driving cells, where a continuous pressure calibration is required. In this work, we present an effective pressure gauge for DACs made of manganin metal, based on the four-probe resistivity measurements. Pressure dependence of its resistivity is well established and shows excellent linear relations in the 0 - 30 GPa pressure range with a slope of 23.4 (9) GPa for the first-cycle compression, in contrast to that of multiple-cycle compression and decompression having a nearly identical slope of 33.7 (4) GPa likely due to the strain effect. In addition, such-established manganin scale can be used for continuously monitoring the cell pressure of piezoelectric-driving DACs, and the reliability of this method is also verified by the fixed-point method with a Bi pressure standard. Realization of continuous pressure calibration for programmably-controlled DACs would offer many opportunities for study of dynamics, kinetics, and critical behaviors of pressure-induced phase transitions.