Abstract
ABSTRACTFor 40 years, many research works have been confusing the linear part of the Ehrenfest equation for the shift of the second-order phase transition temperature in solids by the hydrostatic pressure with the equation for the shift caused by the uniaxial pressure . While the sum of the three slopes is trivially equal to the slope due to hydrostatic pressure , the sum of calculated from the exact Ehrenfest equation for the uniaxial pressure generally does not coincide with and may differ from by the sign and by the absolute value by more than three times.
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