Investigation of Interrelation between Particle Size and Phase Transition in the Al2O3-ZrO2 System

Denis A. Ivanov-Pavlov; Vladimir G. Konakov; Elena N. Solovieva; Viktor M. Ushakov; Natalia V. Borisova

doi:10.4028/www.scientific.net/JNanoR.6.35

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HomeJournal of Nano ResearchJournal of Nano Research Vol. 6Investigation of Interrelation between Particle...

Investigation of Interrelation between Particle Size and Phase Transition in the Al₂O₃-ZrO₂ System

Abstract:

Powder precursors of the Al2O3-ZrO2 system were synthesized by the sol-gel method. Dispersity of the powders depended on synthesis and drying conditions. Differential Scanning Calorimetry, X-Ray diffraction, and method of adsorption–desorption isotherms were used to characterize the interrelations between particle size and phase transition in the Al2O3-ZrO2 system. It was revealed that azeotropic drying under overpressure is quite effective for obtaining well-dispersed powder precursors synthesized by the sol-gel method. In contrast to bulk materials, tetragonal, cubic, and monoclinic phases were found to exist in a wider temperature-composition range. It was shown that the existing phase symmetry in the well-dispersed powders correlates with the crystallite size.