TY - JOUR
T1 - An extension of the concept of epitaxial growth
AU - Sarig, Sara
AU - Hirsch, Danielle
AU - Garti, Nissim
AU - Goldwasser, Benad
PY - 1984/11/1
Y1 - 1984/11/1
N2 - The experimental conditions to maintain metastability in a solution of calcium oxalate during 15 min were defined. Seed crystals of uric acid and sodium urate were added and the decrease of calcium ion concentration was measured by a calcium selective electrode. Sodium urate crystals caused a decrease of about 14% while uric acid seeds were inactive. The growth of calcium oxalate on sodium urate surface was confirmed by X-ray emission analysis. When glumatic acid was added at 4-5 ppm concentration to the metastable solution containing uric acid seeds, a ca. 28% calcium concentration decrease was observed. The precipitation of calcium oxalate on uric acid was confirmed by X-ray emission analysis. The results show that a structural fit at an atomic level between two solids, which is a necessary condition for epitaxis, is not sufficient for epitaxial growth to occur. An additional factor, namely attraction at an ionic or molecular level, is also needed. It may be furnished by a mediating agent compatible with both solids.
AB - The experimental conditions to maintain metastability in a solution of calcium oxalate during 15 min were defined. Seed crystals of uric acid and sodium urate were added and the decrease of calcium ion concentration was measured by a calcium selective electrode. Sodium urate crystals caused a decrease of about 14% while uric acid seeds were inactive. The growth of calcium oxalate on sodium urate surface was confirmed by X-ray emission analysis. When glumatic acid was added at 4-5 ppm concentration to the metastable solution containing uric acid seeds, a ca. 28% calcium concentration decrease was observed. The precipitation of calcium oxalate on uric acid was confirmed by X-ray emission analysis. The results show that a structural fit at an atomic level between two solids, which is a necessary condition for epitaxis, is not sufficient for epitaxial growth to occur. An additional factor, namely attraction at an ionic or molecular level, is also needed. It may be furnished by a mediating agent compatible with both solids.
UR - http://www.scopus.com/inward/record.url?scp=0002785171&partnerID=8YFLogxK
U2 - 10.1016/0022-0248(84)90012-5
DO - 10.1016/0022-0248(84)90012-5
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AN - SCOPUS:0002785171
SN - 0022-0248
VL - 69
SP - 91
EP - 95
JO - Journal of Crystal Growth
JF - Journal of Crystal Growth
IS - 1
ER -