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5092881 
Journal Article 
Growth Layers on Ammonium Dihydrogen Phosphate 
Torgesen, JL; Jackson, RW 
1965 
1 
Science
ISSN: 0036-8075
EISSN: 1095-9203 
148 
3672 
952-954 
English 
17751046 
Microscopic observations of growth layers and etch pits on ammonium dihydrogen phosphate crystals reveal screw dislocations on the {100} face generating elliptical spirals that change rapidly but reversibly to rectangular shape when chromium-ion impurity is added. The effects of the impurity on crystal habit are judged to be secondary to changes in the morphology of the growth layers. No sources of growth are observed on the {101} faces; the layers spread inward from the edges and at times are mutually annihilating so that, temporarily, no steps are observed. Similar behavior is recorded for the {1011} faces of NaNO(3).