This article is cited in 7 papers

Brief Communications

Phase transformations during the growth of paracetamol crystals from the vapor phase

A. P. Belyaev^a, V. P. Rubets^b, V. V. Antipov^b, N. S. Bordey<sup>a

a</sup> Saint-Petersburg Chemical-Pharmaceutical Academy
^b State Technological Institute of St. Petersburg (Technical University)

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.

Received: 24.12.2013

 English version: Technical Physics, 2014, 59:7, 1101–1103

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