CHEMICAL AND PHASE-TRANSFORMATIONS OF GAMMA-FEOOH IN NAOH SOLUTIONS

Authors
TOLCHEV AV BAGAUTDINOVA RR KLESHCHEV DG PLETNEV RN KOPTEV IV
Citation
Av. Tolchev et al., CHEMICAL AND PHASE-TRANSFORMATIONS OF GAMMA-FEOOH IN NAOH SOLUTIONS, Inorganic materials, 32(11), 1996, pp. 1207-1210
Citations number
13
Categorie Soggetti
Material Science
Journal title
Inorganic materials → ACNP
ISSN journal
00201685
Volume
32
Issue
11
Year of publication
1996
Pages
1207 - 1210
Database
ISI
SICI code
0020-1685(1996)32:11<1207:CAPOGI>2.0.ZU;2-S
Abstract
The transformations of the metastable phase gamma-FeOOH into alpha-FeO OH or alpha-Fe2O3 during hydrothermal treatment between 135 and 230 de grees C in NaOH solutions with concentration C varying from 0.5 to 12. 5 mol/l were studied by x-ray diffraction and electron microscopy. The stability fields of the forming phases were refined. For C greater th an or equal to 4 mol/l, platelike alpha-Fe2O3 crystallites were found to form. The growth mechanisms were analyzed to explain the morphologi cal features observed.