16 research outputs found
On the growth of ammonium nitrate(III) crystals
The growth rate of NH4NO3 phase III crystals is measured and interpreted using two models. The first is a standard crystal growth model based on a spiral growth mechanism, the second outlines the concept of kinetical roughening. As the crystal becomes rough a critical supersaturation can be determined and from this the step free energy. The step free energy versus temperature turns out to be well represented by a KosterlitzÂżThouless type model. Further a phenomenological treatment of some peculiar growth observations is given
On the morphology of ammonium nitrate (III): theory and observation
The aim of this paper is to derive on a theoretical basis the morphology of crystals of ammonium nitrate, phase III, and to compare the results with experimental growth forms. The theory used is based on the concepts of periodic bond chain (PBC), F face and connected net, developed by Hartman and Perdok. Further an Ising model is used to determine roughening temperatures. Based on different criteria theoretical growth forms are predicted and compared with experiments
The Stability of Satellite Faces on Modulated Crystals
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Comprehensive Computerized Survey of the Slice Configurations of Nh4h2po4 (Adp) Type Structures
Comprehensive Computerized Survey of the Slice Configurations of Nh4h2po4 (Adp) Type Structures
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