Abstract
Abstract The presence of a higher-order phase transition at around 60–70°C in phenanthrene crystal, previously suggested by the anomalies in electrical conductivity and in thermal expansion, and by the endothermic phenomenon, has been confirmed through an X-ray powder diffraction study. The results disclose the following facts: (1) the phenomena of the transition begin about 45°C and gradually become remarkable with a rise in the temperature, until the phenomena practically cease to occur at 68–69°C; (2) the lattice constants for the monoclinic cell increase conspicuously in the temperature range from about 50°C to 68°C, while both the crystal system, which is monoclinic, and the space group, P21, remain unaltered on passing through the transition temperature, and (3) the unit cell dimensions of the high-temperature modification determined at 80°C are: a=8.54, b=6.25, c=9.55 Å and β=99.0°.
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