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- W2080758506 abstract "In order to study whether or not the elastic shocks can be radiated from the material undergoing phase chnage, an experiment was carried out by the use of NH4F for the working material. NH4F changes the crystal structure at about 3.8kb and at room temperature. An amount of volume change at this phase change is about 28 percent. When the polycrystalline NH4F specimen was supercompressed or superdecompressed, a sudden shock occurred followed by many rectangular pulses with a short pulse width of about 50 milliseconds. After these shocks propagated in the pressure medium, a shock with a large pulse width of about 2 seconds appeared. This last shock seems to have been due to the absorption of a high frequency component. The direction of initial motion for the shock at the phase change from a low pressure form to a high pressure form is opposite to that for the shock at the phase change from a high pressure form to a low pressure form. This fact shows that the shocks were caused directly by the volume change at the phase change. These elastic shocks seem to occur because of the properties of the large hysteresis in NH4F on the transition pressure of phase change.The number of shocks at the phase change was counted. By the use of the relation between the cumulative number of shocks and time, the reaction rate at the phase change of NH4F was calculated based on the theory of reaction kinetics. If the reaction rate is represented by the equation; dX/dt=K(1-X)p, where X is mole fraction of product, t is time, K is the reaction constant and p is the order of reaction, p_??_1 and K_??_10-1/sec. The equation where p=1 means a first order reaction in terms of reaction kinetics." @default.
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- W2080758506 date "1971-01-01" @default.
- W2080758506 modified "2023-10-14" @default.
- W2080758506 title "Generation of Elastic Shocks Accompanied with a Phase Change on NH4F" @default.
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- W2080758506 doi "https://doi.org/10.4294/jpe1952.19.47" @default.
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