TY - JOUR
T1 - Hydrothermal synthesis and characterization of cobalt clays.
AU - Bruce, L. A.
AU - Sanders, J. V.
AU - Turney, T. W.
PY - 1986/1/1
Y1 - 1986/1/1
N2 - Reaction of mixtures of cobalt nitrate, colloidal silica and a metal hydroxide (MOH) under hydrothermal conditions produced a range of Co hydroxysilicates, the components of which depended on the identity of M, T and reactant ratios. At 250oC, for M = Na, a smectite Na0.06Co3.07Si3.95O10(OH)2 was produced; M = K gave either a mica, KCo2.5Si4O10(OH)2, intermediate between di- and trioctahedral, or a Si-deficient mica, KCo3Si3.75O10(OH)2, depending on reactant ratios. For M = Cs, either a vermiculite or a 2:1 layer silicate was obtained; M = Li gave the non-clay Li2CoSiO4; tetra-alkylammonium hydroxides yielded chrysotile. All phases were characterized by chemical analysis, TEM and XRD; further characterization of the smectite was undertaken by diffuse reflectance, IR and X-ray photoelectron spectroscopy. The layer charge in these clays appears to arise from cation vacancies within an almost trioctahedral sheet and possibly within the tetrahedral sheets.-R.A.H.
AB - Reaction of mixtures of cobalt nitrate, colloidal silica and a metal hydroxide (MOH) under hydrothermal conditions produced a range of Co hydroxysilicates, the components of which depended on the identity of M, T and reactant ratios. At 250oC, for M = Na, a smectite Na0.06Co3.07Si3.95O10(OH)2 was produced; M = K gave either a mica, KCo2.5Si4O10(OH)2, intermediate between di- and trioctahedral, or a Si-deficient mica, KCo3Si3.75O10(OH)2, depending on reactant ratios. For M = Cs, either a vermiculite or a 2:1 layer silicate was obtained; M = Li gave the non-clay Li2CoSiO4; tetra-alkylammonium hydroxides yielded chrysotile. All phases were characterized by chemical analysis, TEM and XRD; further characterization of the smectite was undertaken by diffuse reflectance, IR and X-ray photoelectron spectroscopy. The layer charge in these clays appears to arise from cation vacancies within an almost trioctahedral sheet and possibly within the tetrahedral sheets.-R.A.H.
UR - http://www.scopus.com/inward/record.url?scp=0022554881&partnerID=8YFLogxK
U2 - 10.1346/CCMN.1986.0340104
DO - 10.1346/CCMN.1986.0340104
M3 - Article
AN - SCOPUS:0022554881
SN - 0009-8604
VL - 34
SP - 25
EP - 36
JO - Clays and Clay Minerals
JF - Clays and Clay Minerals
IS - 1
ER -