Electrical Properties of Manganin at High Pressures and Dynamic Loading Temperatures
A. A. Golyshev, A. M. Molodets
Federal Research Center for Problems of Chemical Physics and Medical Chemistry, Russian Academy of Sciences, Chernogolovka, Russia
Keywords: manganin, electrical resistance, hysteresis, high pressure, equations of state, shock waves, mathematical modeling, hydrocode
Abstract
The volume-temperature dependence of the specific electrical resistance of manganin in the pressure range of 5 ÷ 70 GPa and temperatures of 300 ÷ 1,000 K of step shock compression is investigated. The electrical resistance of manganin samples is measured under dynamic loading by plane one-dimensional shock waves. Thermal and caloric equations of state of manganin are developed, using which the volume-temperature dependence of the specific electrical resistance of shock-compressed manganin is reconstructed. Under the assumption of reversibility of the specific electrical resistance of the metal, a semi-empirical model of the change in the specific electrical resistance of manganin under compression and unloading, including the hysteresis effect of the manganin sensor, is formulated.
|
