| Abstract [eng] |
The main aim of this research was to prepare different multifunctional iron-based inorganic compounds and investigate their suitability for usage as ceramic pigments and magnetic materials. This work presents detailed study of historical hematite, Ln3Fe5O12 and LnFeO3 (Ln = Ce, Pr, Nd, Tb) pigments and their glazes, Ln3Fe5O12 (Ln = Sm–Lu), bulk Y3Al5-xFexO12 and Y3Al5 xFexO12 thin films. All powder samples were synthesized by an aqueous sol-gel method, while thin films were prepared by dip-coating technique. Single-phase iron(III) oxide (Fe2O3) pigments can be obtained in the temperature range of 500–1000 °C and desirable colour of pigment could be obtained by changing annealing temperature of sol-gel derived precursor. High quality glazes having red/violet shades were obtained at 1000 °C using sol-gel derived Fe2O3 and Tb3Fe5O12 pigments. It was demonstrated, that temperature of crystallization of Ln3Fe5O12 is changing from 1000 °C to 800 °C in the sequence of lanthanides from Sm3+ to Lu3+. Magnetization measurements revealed that magnetic properties of synthesized samples depend on the composition and particle size, and could be successfully controlled by changing the synthesis parameters. Mixed-metal Y3Al5-xFexO12 (YAIG) garnets have been prepared by an aqueous sol-gel method in the whole substitution rang. Sols of 3Y–2Al–3Fe–O, 3Y–1Al–4Fe–O, 3Y–5Fe–O, and 3Y–5Al–O compositions were used for the preparation of thin films. |
