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Abstract
Solubility and pH precipitation studies were carried out to obtain the binuclear complex {[TiO(C9H6NO)2][Sn(C9H6NO)2]} involving 8-hydroxyquinoline as chelating agent. The compound, the individual mononuclear complexes and their physical mixture were evaluated by means of techniques such as TG, DTA, elemental analysis, X-ray diffraction, IR spectroscopy. The properties of the original compounds and also the thermoanalytical conditions exerted a great influence on the degree of crystallinity and on the crystalline phase of the mixed oxide obtained as final product of the thermal decomposition.
Ageing of wet-synthesized oxide powders
Role of surface carbonation, effect on sintering, restoration
Abstract
Wet chemical synthesis of precursor oxide ceramics is a method to obtain small particulate powders. Such powders are far more prone to ageing in air than more traditional precursors. Thermogravimetric analysis is used to highlight the species responsible for the ageing of ceramic precursors. Indeed water and carbon dioxide are observed to evolve from aged powders. Ceramics obtained from aged precursors can reach a very low final density with respect to the theoretical value. A large degree of the original sintering properties can be recovered after washing the aged powders with ethanol in a basic medium.
. Marosi , G , Márton , A , Anna , P , Bertalan , G , Marosfoi , B , Szép , A . Ceramic precursor in flame retardant systems . Polym Degrad Stab 2002 77 : 259 – 265 10.1016/S0141-3910(02)00057-5 . 7
-3910(01)00179-3 . 17. Marosi , G , Marton , A , Anna , P , Bertalan , G , Marosfoi , B , Szep , A . Ceramic precursor in flame retardant systems . Polym Degrad Stabil . 2002 ; 77 : 259 – 265 . 10.1016/S0141
Some heterobimetallic oxalate coordination precursors of lanthanum(III) of the type, M3[La(C2O4)3(H2O) m ]2·nH2O (M = Mn(II), Co(II), Ni(II) and Cu(II))
An investigation on the solid-state pyrolytic decomposition
ceramic precursors [ 1 ], selective extractions of rare earth ions [ 2 ]. Due to high and variable coordination modes of lanthanide ions and the competitive interactions between lanthanide and transition metal ions for the organic ligands the compounds on
