Relative length changes in orthorhombic crystals of a·TNT have been measured from 77 to 273 K. Using a three-terminal capacitance technique, length changes were measured with a resolution of 10-9 cm under optimum conditions. Relative temperature changes of I part in 10 5 were detected with a platinum resistance thermometer used as one arm of an ac resistance bridge. The linear expansion coefficient calculated from these data is found to have a second-order transition with a critical temperature, T c = 211.7 K. Mangelsdorf plots indicate logarithmic behavior of the linear expansion coefficient along all crystalline axes for the temperature intervals 203 K < T < T c and 223 K < T < T c' The volume expansion coefficient was obtained from the three linear expansion coefficients.
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