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

Iron Doped-ZrSiO4: Structural, Microstructural and Vibrational Characterization

“…According to Alahakoon et al 26 , the presence of monoclinic zirconia (m-ZrO 2 ) indicates that zircon is slightly dissociated at this time and temperature 25 . At this stage, the reflection due to t-ZrO 2 disappearing, confirms the theory that zircon is formed from amorphous silica and m-ZrO 2 [26] . Furthermore, at this stage, relatively sharp reflections of hematite crystal phase are resolved in XRD.…”

“…Strikingly, the trend in the lattice volume variation of Fe-ZrSiO 4 solid solutions with increasing the Fe nominal content found by those authors is opposite to the one reported in this work, that is, the lattice volume exhibits a contraction on incorporating the Fe into the zircon lattice. These changes in lattice parameters for samples heated at 1600 °C could be caused by the dissociation of zircon 25,26 . This dissociation will be subjected for a further characterization work.…”

“…In the last decade, several authors have studied different topics referred to the structural and chemical characteristics of Fe-ZrSiO 4 [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] . The mechanism of formation, the chemical state, and location of Fe cation in the zircon structure, the actual presence of segregated hematite and dissociation of zircon [25][26][27] have been considered as main topics. In this context, our work over the last few years has been to develop Fe-containing zircon solid solution materials from free-mineralizer precursors with new potential applications, as for instance in electrocatalytic processes 28,29 .…”

Coordinative Crystallization of ZrSiO4 and α-Fe2O3 Composites and Their Resultant Structural, Morphological, and Mechanical Characteristics

“…Alahakoon et al obtained almost a single phase ZrSiO 4 at 1400 °C by using 5% iron as a dopant with no detection of iron oxide as a separate phase, and this means that Fe has entered the crystal lattice of ZrSiO 4 . 49 K.-R. Pyon and B.-H. Lee investigated the effect of iron as a dopant by varying its concentration from 5−30% and concluded that all the investigated compositions resulted in the formation of mixture of multiple phases, namely, α-Fe 2 O 3 , ZrSiO 4 , t-ZrO 2 , m-ZrO 2 , and c-SiO 2 at 1300 °C. 50 Herrera et al obtained solid solution of iron doped ZrSiO 4 at 1100 °C, and they also demonstrated that Fe 3+ has occupied the tetrahedral lattice of ZrSiO 4 by replacing Si 4+ ions.…”

Influence of the zirconia transformation on the thermal behavior of zircon–zirconia composites

“…There are several studies of ceramic-ceramic composite materials in which zircon acts as a continuous matrix in which different ceramic phases were introduced as particles, whiskers, or fibers [41][42][43][44][45][46][47][48][49].…”