Publikationsdatum:
2015-04-28
Beschreibung:
Evidence of growth rate dispersion for symmetry-related opposite faces of centrosymmetric single crystals of ammonium perchlorate is provided. Crystallization experiments conducted by evaporation of a stagnant aqueous solution at room temperature show that some faces have high and irregular normal growth rates, in time and space, whereas the corresponding faces crystallize slowly and steadily. The faces presenting high and irregular crystal growth also form repetitive inclusions, whereas faces are not involved in any formation of vacuoles. As a consequence, it is possible to retrace the crystallization history of a single crystal by analyzing the location of series of inclusions showing the progressive displacement of its center of gravity. Crystal growth rate dispersion of ammonium perchlorate crystallized by evaporation of an aqueous solution at room temperature is evidenced by considering some Friedel pairs of faces. The relationship between the formation of inclusions and a high growth rate of crystal faces is highlighted. Considering the locations of the inclusions, the results demonstrate a high heterogeneity of crystal growth rates, from which the history of crystal growth can be retraced.
Print ISSN:
0930-7516
Digitale ISSN:
1521-4125
Thema:
Chemie und Pharmazie
,
Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
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