The thermal decomposition mechanism of iron(III) hydroxide carbonate to ?-Fe2O3

Synthesis of polycrystalline yttrium iron garnet and yttrium aluminium garnet from organic precursors

“…Combining the information obtained from both these techniques, it can be assumed that the organic polyester matrix decomposes via a metal carboxylate mixture to a basic carbonate at 425 ~ As basic ferric carbonate decomposes by 400 ~ [14] and a GLMA precursor of Fe/O3 was found to be mass stable before 400 ~ (Fig. lb), it is possible that Fe20 3 and the basic carbonate of yttrium (Y (OH) CO3) exist after the decomposition of the organic matrix.…”

The oxidation of carbonate green rust into ferric phases:solid-state reaction or transformation via solution

“…The FTIR spectrum of the exGR-Fe(III) product is given in Figure 3c. The 470 and 655 cm Ϫ1 bands are assigned to stretching Fe-O modes in octahedral Fe-O(OH) coordination (Markov et al, 1990). The broad band between 2300 and 3600 cm Ϫ1 , attributed to OH stretching vibrations in water molecules and hydroxyl groups, is the sum of three contributions located at 3465, 3290, and 3020 cm Ϫ1 .…”

“…The formation of feroxyhite, ␦-FeOOH, or ferrihydrite was claimed, based on the presence of a line at 0.254 nm in the diffraction pattern. And last, a study by Markov et al (1990) in which an iron(III) hydroxide carbonate was obtained from the decomposition of siderite in wet air, can also be mentioned.…”

A new reduction route for the synthesis of nanoscale metals and metal oxides with ascorbic acid at low temperature

“…Some methods have been developed to synthesize iron oxide powders with specific particle sizes [45][46][47][48], comparing with mention methods, directly reduction synthesis has considerable advantages of a single step process at low temperature, composition and morphological control. The nanoparticles of Į-Fe 2 O 3 were obtained in alkali medium with dripping ascorbic acid into solution.…”