Authors:M. Ştefănescu, O. Ştefănescu, M. Stoia, and C. Lazau
paper we present a study on the synthesis of Fe(III) oxide, by thermal decomposition
of some complex combinations of Fe(III) with carboxylate type ligands, obtained
in the redox reaction between some polyols (ethylene glycol (EG), 1,2-propane
diol (1,2PG), 1,3-propane diol (1,3PG) and glycerol (GL)) and NO3–
ions (from ferric nitrate). Fe2O3
was obtained by thermal decomposition of the synthesized metal-organic precursors
at low temperatures. γ-Fe2O3
was obtained as nanoparticles at 300C, while at higher temperatures α-Fe2O3
starts to crystallize and becomes single phase at ~500C.
formation of the metal-organic precursors and their thermal decomposition
were studied by thermal analysis and FTIR spectroscopy.
of Fe2O3 crystalline phases
with the thermal treatment of iron complexes was followed by RX diffractometry.
The size of γ-Fe2O3 nanoparticles
was estimated by transmission electron microscopy (TEM).
Authors:G. Chuah, S. Jaenicke, K. Chan, S. Khor, and J. Hill
Thermal decomposition of metal-organic precursors for the mixed oxide BaBiO3 was studied using TG and EGA. Precursors produced by polyesterification of bifunctional acids with ethylene glycol (Pechini
process) decomposed about 100°C higher than those without the diol. BaCO3 was identified by IR and XRD as a reaction intermediate. EGA proved that the amount of BaCO3 was below 10% of the total barium, and that the barium exists mainly as a nitro-compound up to 650°C. Phase-pure BaBiO3 with a moderately high surface area (1.4 m2/g) could be synthesised from a citrate precursor by the Pechini process at around 850°C.
Authors:Hichem Eloussifi, Jordi Farjas, Pere Roura, and Mohamed Dammak
Suitable thermal treatment of metal organic precursors is a key process to obtain oxide films. To this purpose, non-isothermal model-free predictions are specially suited. In this article we will explore the ability of these methods to provide an accurate prediction of the evolution of the decomposition of yttrium trifluoroacetate, a precursor used in the synthesis of YBaCuO superconducting thin-films. A good agreement has been obtained between the predicted and the measured reaction courses.
Authors:A. Kaddouri, C. Mazzocchia, E. Tempesti, R. Nomen, and J. Sempere
Copper chromite catalysts were prepared by using a new metal organic precursor, M(OR)n, which was dissolved in organic solvent,
hydrolysed and condensed to form inorganic polymers containing M-O-M linkages. In the cases of Ba and Mn promotion, the corresponding
metal oxide was admixed to the copper-chromium solution prior to gelification. After drying in helium atmosphere, the precursor
was subjected to thermal treatment at different temperatures (373-873 K) and in different atmospheres (air, nitrogen or hydrogen).
Both the catalysts and the industrial Engelhard catalyst were characterized by various techniques (TG-DTA, HTXRD, IR, BET,
metallic copper surface area and porosimetry measurements) and evaluated for ester hydrogenation.
Authors:Mirela Barbu, Mircea Stefanescu, Marcela Stoia, Gabriela Vlase, and Paul Barvinschi
between metal nitrates and 1,3-propanediol, with formation of the complex combinations inside the hybrid gels. The gels were thermally treated at 300 °C when the oxidative decomposition of the metal–organicprecursors took place with formation of the
Authors:Kseniya V. Zherikova, Ludmila N. Zelenina, Natalia B. Morozova, and Tamara P. Chusova
, Gelfond , NV , Mischenko , AV , Norman , JA 2007 Approach to control deposition of ultra thin films from metalorganicprecursors: Ru deposition . Surf Coat Technol. 201 : 9003 – 9008 10.1016/j.surfcoat.2007
Authors:Neeraj Sharma, Amit Pathania, and Mala Sharma
cocatalyst [ 18 ]. Owing to the utility of niobium oxides and mixed oxides as effective catalysts in many processes, the synthesis of metal–organicprecursors affording these oxides has assumed remarkable importance. In this context, phenomenal interest in
Authors:M. Hernández-Escolano, X. Ramis, A. Jiménez-Morales, M. Juan-Díaz, and J. Suay
complex shapes and to produce thin films without the need for machining or melting and this method is waste-free and excludes the stage of washing [ 1 – 9 ].
The most widely used metal–organicprecursors for the preparation of materials by sol