Solid‐Solution Formation in the Synthesis of Fe‐Zircon

Abstract

To investigate solid‐solution formation in the iron‐doped silicate (zircon) system, different samples were prepared by the ceramic method with addition of LiF as a mineralizer. The results of X‐ray powder diffraction (XRD), 57Fe Mössbauer, and UV–visible spectroscopy showed that in the as‐prepared samples, only a small fraction of iron, i.e., about 2.5 mol%, is hosted in the zircon structure as paramagnetic Fe3+ species, while the remaining Fe3+ cations form magnetic α‐Fe2O3 particles that are trapped in the zircon matrix.

Fully densified zircon co-doped with iron and aluminium prepared by sol–gel processing

“…Conclusions reached in the literature concerning the actual location of dopant cations and their valence in the zircon lattice [15][16][17][18]22,23 lack consistency. During the synthesis of iron coral (a zircon based pigment) by coprecipitation routes, Llusar et al 3 observed that iron mainly appears to be in two different forms: (i) segregated, forming Fe 2 O 3 aggregates of different morphology and sizes or (ii) as micron sized Fe 2 O 3 particles adsorbed or encrusted on the surface of the bigger zirconia monoliths.…”

Multifunctional advanced ceramics from preceramic polymers and nano-sized active fillers

“…51,52 The reduction of network connectivity appears as a triggering event, since silicates feature partially covalent bonding and consequently limited ionic interdiffusion 53 ; moreover, zircon formation is associated to the motion of silicon and oxygen ions, rather than of zirconium ones. 54 The beneficial effect of TiO 2 was exploited also for mullite ceramics embedding ZrO 2 nano-particles, to form nano-structured zirconia-toughened composites. 35 As mentioned above, the approach of mixing preceramic polymers with nano-sized fillers for the synthesis of oxynitrides faces the intrinsic complexity in the phase assemblage within the ceramic residue, which is produced under non-oxidizing heating atmosphere.…”

A new chemical strategy: Mineralizer-free synthesis of iron zircon ultrafine particles by an epoxide assisted sol–gel route

“…The obtained particulate product, with large particle size and very wide size distribution, does not meet the requirement of some applications such as high temperature ink. Usually, mineralizers [8], such as NaF and LiF, are added into the precursor mixture to lower the reaction temperature to around 1000°C. However, mineralizer can induce serious aggregation of the particles, and lead to the formation of impurity through the reaction with reactants.…”