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ZIRCONIUM AND HAFNIUM DIOXIDES DOPED BY OXIDES OF YTTRIUM, SCANDIUM AND ERBIUM: NEW METHODS OF SYNTHESIS AND PROPERTIES

https://doi.org/10.32362/2410-6593-2018-13-5-30-37

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Abstract

The results of elaborating a method for the synthesis of zirconia and hafnia doped by rare earths (yttrium, erbium and scandium) by using low-hydrated hydroxides of zirconium and hafnium as precursors are reported. The low-hydrated zirconium and hafnium hydroxides were prepared using the heterophase reaction. The physicochemical properties (including sorption properties) of low-hydrated zirconium and hafnium hydroxides ZrxHf1-x(OH)3÷1O0.5÷1.5·0.9÷2.9H2Owere studied. The scheme of thermal decomposition of low-hydrated hydroxides in air was determined. The sorption properties of the low-hydrated hafnium hydroxide are less pronounced owing to the lower amount of sorption centers, in this case, hydroxo and aqua groups. The sequence of stages of thermal decomposition of rare earth acetates was elucidated. Single-phase zirconia and hafnia doped by rare earths (yttrium, erbium and scandium) were obtained. The parameters of the elementary lattice were calculated for each phase. It was established that the stabilization of zirconium dioxide with yttria leads to the formation of interstitial solid solutions based on tetragonal zirconia (in the case of the composition Y2O3×4ZrO2 - cubic modification), with erbium oxide - interstitial solid solutions based on cubic zirconia; with scandium oxide - solid solutions based on tetragonal zirconia. The article presents the results of measuring electrical conductivity.

About the Authors

E. E. Nikishina
MIREA - Russian Technological University (M.V. Lomonosov Institute of Fine Chemical Technologies)
Russian Federation

Ph.D. (Chemistry), Associate Professor, , K.A. Bolshakov Chair of Chemistry and Technology of Rare and Scattered Elements, Nanoscale and Composite Materials

86, Vernadskogo Pr., Moscow 119571, Russia

ResearcherID О-7115-2014



E. N. Lebedeva
MIREA - Russian Technological University (M.V. Lomonosov Institute of Fine Chemical Technologies)
Russian Federation

Ph.D. (Chemistry), Engineer, K.A. Bolshakov Chair of Chemistry and Technology of Rare and Scattered Elements, Nanoscale and Composite Materials

86, Vernadskogo Pr., Moscow 119571, Russia



D. V. Drobot
MIREA - Russian Technological University (M.V. Lomonosov Institute of Fine Chemical Technologies)
Russian Federation

D.Sc. (Chemistry), Professor, K.A. Bolshakov Chair of Chemistry and Technology of Rare and Scattered Elements, Nanoscale and Composite Materials

86, Vernadskogo Pr., Moscow 119571, Russia



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For citation:


Nikishina E.E., Lebedeva E.N., Drobot D.V. ZIRCONIUM AND HAFNIUM DIOXIDES DOPED BY OXIDES OF YTTRIUM, SCANDIUM AND ERBIUM: NEW METHODS OF SYNTHESIS AND PROPERTIES. Fine Chemical Technologies. 2018;13(5):30-37. (In Russ.) https://doi.org/10.32362/2410-6593-2018-13-5-30-37

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ISSN 2410-6593 (Print)
ISSN 2686-7575 (Online)