A Jump Change in the Sublimation Coefficient of the PrBr₃
Single Crystal at the Polymophic Transition Point

M. F. Butman^a, V. B. Motalov^a, L. S. Kudin^a, A. S. Kryuchkov^a, A. E. Grishin^a,
and K. W. Krämer^b

^a Ivanovo State University of Chemical Technology, Ivanovo, Russia

^bDepartment for Chemistry, University of Bern, Bern, Switzerland

e-mail: butman@isuct.ru

Received November 19, 2007

Abstract—The sublimation of praseodymium tribromide under Knudsen and Langmuir conditions was studied
by high-temperature mass spectrometry over the temperature range 804–957 K. During sublimation from the
open surface of a single crystal, the sublimation coefficient of PrBr₃ changed abruptly at the polymorphic tran-
sition point (UCl₃-type low-temperature polymorph–PuBr₃-type high-temperature polymorph, T = 934 3 K).
The change was reproducible in the heating–cooling cycles.

DOI: 10.1134/S0036024408110332

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