Phase transformations during the growth of paracetamol crystals from the vapor phase |
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Authors: | A P Belyaev V P Rubets V V Antipov N S Bordei |
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Institution: | 1. St. Petersburg State Chemicopharmaceutical Academy, ul. L’va Tolstogo 7, St. Petersburg, 197376, Russia 2. St. Petersburg State Institute of Technology (Technical University), Moskovslii pr. 26, St. Petersburg, 190013, Russia
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Abstract: | Phase transformations during the growth of paracetamol crystals from the vapor phase are studied by differential scanning calorimetry. It is found that the vapor-crystal phase transition is actually a superposition of two phase transitions: a first-order phase transition with variable density and a second-order phase transition with variable ordering. The latter, being a diffuse phase transition, results in the formation of a new, “pretransition,” phase irreversibly spent in the course of the transition, which ends in the appearance of orthorhombic crystals. X-ray diffraction data and micrograph are presented. |
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