Anomalous temperature dependence of third-order elastic constants in NH4Cl and NH4Br near the λ point |
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Authors: | H Yamashita I Tatsuzaki |
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Institution: | Research Institute of Applied Electricity, Hokkaido University, Sapporo 060, Japan |
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Abstract: | Second order elastic constants of NH4Cl and NH4Br crystals were measured under hydrostatic and uniaxial pressures near the λ-type phase transitions. Third order elastic constants were calculated from the pressure derivatives of the second order elastic constants. Results show that the temperature dependences of the third order elastic constants of NH4Cl differ from those of NH4Br dramatically. In addition, it is found that the coefficients and of strains in the free energy of NH4Cl show quite different temperature dependences from those of NH4Br. |
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