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A simple piston-cylinder apparatus was developed for impedance spectroscopy at pressures up to 3 GPa and temperatures up to 500°C. The apparatus is of the compound cylinder type, with the innermost cylinder made of a commercially available low-cost alumina-based ceramic, with pistons of hard metal that allow electric connections. Cell electrical resistance was higher than 1 M⍀ at TϽ300°C and higher than 100 k⍀ at 400°C. The inductivity in the wires and pistons was about 2 H. The sample wasdoi:10.1063/1.1147808 fatcat:qedvszcifbbj7k7nppps44b3cm