Influence of the nature of iron, aluminium and yttrium organometallic nanocluster precursors on the formation mechanism of ceramic ZrO2 obtained by sol-gel method

Abstract

Abstract. To obtain new effective precursors for single phase ceramic zirconia materials by the alkoxide route, three heterometallic iron-yttrium acetylacetonate complexes were synthesized by electrochemical anodic dissolution in acetylacetone. The structure and properties of the synthesized complex oxides were studied by XRD, EXAFS, magnetic susceptibility and M6ssbauer. It was shown that, for iron-containing gels and oxides, Fe 3+ ions--interchangeably with Y3+--participate in the oxide formation mechanism. The sets of interatomic distances found by EXAFS in the iron-yttrium precursor and in the zirconia gel are practically equal. The presence of structure fragments formed by these interactions--and especially by direct Fe--Y bonds in the precursors--allows single-phase triple ceramic oxides to form.

Co-doping effects of Y3+ and Sc3+ on the crystal structures, nanoparticle properties and electrical behavior of ZrO2 solid solutions prepared by a mild urea-based hydrothermal method

“…So far, various techniques, including inert gas condensation, 12 plasma techniques, 13 spray pyrolysis, 14 coprecipitation, 15 sol-gel synthesis, 16 forced hydrolysis 17 and solvothermal (hydrothermal [18][19][20][21] and alcohol-thermal 22 ) methods have been developed for the preparation of zirconia-based ceramics. Among these techniques, the solvothermal method has the advantages that it allows single-step low temperature synthesis and provides superior composition and morphological control, and powder reactivity.…”

The synthesis and characterisation of mixed Y2O3-doped ZrO2and α-Fe2O3nanosized powders

“…3,11 The vast majority of the zirconia-hematite mixed powder reports describe the use of undoped zirconia, [12][13][14][15] however, some reports on the synthesis of mixed yttria-doped zirconia-hematite powders also exist. [16][17][18] It is not really known though, what influence the presence of yttria has on the solid solubility of Fe 31 in zirconia.…”

Nanocrystalline rare earth stabilized zirconia: solvothermal synthesis via heterogeneous nucleation-growth mechanism, and electrical properties

“…Using fine particles is regarded as a promising way to improve the homogeneity and sinterability of the green body and finally to achieve the desirable properties for the applications. So far, various techniques including inert gas condensation, 1 plasma technique, 2 spray pyrolysis, 3 coprecipitation, 4 sol-gel synthesis, 5 forced hydrolysis, 6 and solvothermal (hydrothermal [7][8][9][10] and alcohol-thermal 11 ) methods have been developed to prepare the fine particles. Among these techniques, the solvothermal method promises a single step low-temperature synthesis, superior composition and morphological control, and powder reactivity.…”