STIRRING EFFECTS ON PROPERTIES OF AL GOETHITE FORMED FROM FERRIHYDRITE

Authors
SCHWERTMANN U STANJEK H
Citation
U. Schwertmann et H. Stanjek, STIRRING EFFECTS ON PROPERTIES OF AL GOETHITE FORMED FROM FERRIHYDRITE, Clays and clay minerals, 46(3), 1998, pp. 317-321
Citations number
25
Categorie Soggetti
Agriculture Soil Science","Water Resources",Mineralogy
Journal title
Clays and clay minerals → ACNP
ISSN journal
00098604
Volume
46
Issue
3
Year of publication
1998
Pages
317 - 321
Database
ISI
SICI code
0009-8604(1998)46:3<317:SEOPOA>2.0.ZU;2-J
Abstract
Minerals in surface environments form in both turbulent and non-turbul ent systems. This study compares the properties of Al goethite formed from ferrihydrite at 60 degrees C in 0.3 M KOH with and without mechan ical stirring. Compared to the static system, stirring increased cryst al order and needle thickness, decreased unit cell edge length a, but not b and c, reduced the separation between the 2 OH-bending vibration s, increased Al substitution and promoted hematite formation.