PHASE EQUILIBRIA IN THE Al2O3–TiO2–Y(Er)2O3 SYSTEMS AT 1400 ºС
Journal Title: Вісник Одеського національного університету. Хімія - Year 2017, Vol 22, Issue 4
Abstract
The aim of this investigation is the construction of isothermal sections for the Al2O3-TiO2-Y(Gd)2O3 phase diagrams at 1400ºС as part of systematic investigations of Al2O3-TiO2-Ln2O3 (Ln=lanthanides, Y) systems. The 1400°C was taken as the temperature, at which no liquid phases are expected in the both systems. The isothermal sections at 1400 °С for the Al2O3– TiO2–Y(Er)2O3 phase diagrams were constructed for the first time. Samples were prepared by a chemical method. Samples were annealed in air at 1400°С for 80 hours and cooled in the furnace. This temperature value was selected with a view to provide possibility of phase transformations character studies. New phases and appreciable solubility regions based on the components and binary compounds were not found, as predicted. Triangulation of the systems is determined by the phase Y(Er)2T2O7, which is in equilibria with compounds Al2TiO5, Y(Er)3Al5O12, Y(Er)AlO3, Y(Er)4Al2O9 and components TiO2 and Al2O3. The structures of isothermal sections of the both systems are similar. The systems are triangulated into six secondary triangles, in which three-phase eutectic are expected. In five quasibinary sections two-phase eutectic should expect to exist. The obtained results will make a significant contribution to the understanding of interactions between the components in the systems studied.This systems offer a number of promising opportunities such as high-temperature structural composites based on directionally solidified two-phase and three-phase eutectic materials, solid electrolytes (SOFCs, oxygen sensors, film for electronic devices, etc.), promising to accumulate water, immobilizing materials for nuclear industry, tough ceramics, catalysts carriers, wear- and corrosion-resistant ceramic coatings and super refractories.
Authors and Affiliations
I. S. Tyshchenko, M. S. Glabay, A. A. Makudera, S. M. Lakiza, E. V. Dudnik
Keywords
Related Articles
- EP ID EP336078
- DOI 10.18524/2304-0947.2017.4(64).115934
- Views 83
- Downloads 0
ADSORPTION AND PROTECTIVE PROPERTIES OF MODIFIED CLINOPTILOLITE IN RESPECT OF SO2
The dynamics of sulfur dioxide adsorption by samples of clinoptilolite both natural and modified by thermal, hydrothermal, and acid-thermal methods at SO2initial concentrations in gas-air mixture ranging from 50 to 200 m...
INFLUENCE OF THERMAL TREATMENT ON THE PHYSICAL AND CHEMICAL PROPERTIES OF NANOCRYSTALLINE 88 ZrO2 - 12 CeO2 (MOLE %) POWDER
Transformation toughening, based on the martensitic T-ZrO2 → M-ZrO2 phase transformation, causes the high strength of ZrO2-based composites. The reversible martensitic phase transformation of fine-grained composites ZrO2...
GETERONUCLEAR BIS(GALACTARATO)GERMINATES OF COBALT(ІІ), COPPER(ІІ), NICKEL(ІІ): SYNTHESIS, STRUCTURE AND CHEMICOPHYSICAL PROPERTIES
Heterometallic bic(galactarato)germanates of cobalt(ІІ), copper(ІІ) and nickel(ІІ) were synthesized for the first time and characterized with the method of elemental analyses, thermogravimetry and IR-spectroscopy. The IR...
DETERMINATION OF RIVASTIGMINE HYDROTARTRATE RESIDUES ON PHARMACEUTICAL MANUFACTURING EQUIPMENT SURFACES BY HPLC AND LUMINESCENCE METHODS
Highly sensitive HPLC methods of determination of rivastigmine hydrotartrate trace amounts for cleaning of the pharmaceutical equipment have been proposed. The developed methods have been validated on the following param...
COLLOIDAL- AND CHEMICAL CONSISTENCIES OF FLOTATION-WITH-CARRIER WATER CLEANING FROM CHROME VI IONS
Size-consist and electrokinetic effects in heterogenic system generated by flotation-with-carrier water cleaning from Cr (VI) ions experimentally researched. Based on fundamental principles of DLVO Theory ascertained tha...