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Kinetics and Mechanism of Prephase State Accumulation and Phase Transition in Crystals of 2-Bromo-2-Nitropropane-1,3-Diol

✍ Scribed by N.I. Golovina; A.V. Raevskii; B.S. Fedorov; I.G. Gusakovskaya; R.F. Trofimova; L.O. Atovmyan

Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
354 KB
Volume
137
Category
Article
ISSN
0022-4596

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✦ Synopsis

The structure of two phases of 2-bromo-2-nitropropane-1,3diol (1,2) synthesized by two different methods has been investigated. Calorimetric measurements of temperature behavior of crystals I and II have been conducted, with the crystals manifesting phase transition in a wide temperature range, 193-343 K. The changes of the initial monoclinic phase I featuring the ''prephase'' state have been studied during heating to the phase transition temperature for polycrystal samples. X-ray patterns showing that polycrystal I transformed into a final cubic phase at 375 K have been identified. The phase transition process in separate crystals of 2-bromo-2-nitropropane-1,3-diol has been investigated in a special hot stage under an optical microscope. The kinetic parameters of the prephase accumulation have been calculated from kinetic measurement of the reflection intensities (110), (200), and (040) of monoclinic phase I at temperatures 348, 358, and 363 K.

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