Phase-Transition Behaviors of Crystalline Hypophosphorous Acid and a Feasible Incommensurate Wave-like Array of the Proton Displacements from Each Center of Hydrogen Bonds along the 1-Dimensional Chain
Abstract:Crystalline hypophosphorous acid,
composed of strongly hydrogen-bonded
chains, was investigated by adiabatic calorimetry in a temperature
range between 20 and 306 K and by dielectrometry as a supplemental
means. The heat-capacity curve showed subsequent phase transitions:
a second-order one at 210.4 K followed by a first-order one at 159
K and the other two ones at 149 and 139.4 K with decreasing temperature.
The total entropy of the transitions was assessed to be 0.35 J K–1 mol–1 by using the baseline heat
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