Abstract
A high pressure Manganin gauge with multiple integral calibrants has been developed. It allows accurate and continuous pressure measurement in the 100-kbar range at both room and elevated temperatures. The gauge is designed for use in piston-cylinder, multianvil, and other relatively large volume pressure apparatus. One modification of the gauge consists of a Manganin coil wound on a threaded insulating sleeve which encloses a core of primary calibrants. Bismuth, thallium, and barium have been used for calibrants because they provide four widely separated fixed points in the 100-kbar range. The principle of the gauge's operation is based on (a) the nearly linear dependence of the resistance of Manganin on pressure, (b) the volume discontinuities accompanying pressure-induced first-order phase transitions in the calibrants, and (c) the appreciable strength and rigidity at high pressure of commonly used solid pressure-transmitting media. The over-all response of the gauge consists of nearly linear segments of increasing resistance vs pressure between well-established fixed points. The extension of the range of the gauge to higher pressures and its use for semiquantitative estimates of unknown volume changes accompanying polymorphic transitions are described.
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