Open AccessStabilization of rare earth elements (La, Nd, Pr, Ce) by ZrO<sub>2</sub> concentrate
Author(s) -
V. B. Kulmetyeva,
С. Е. Порозова,
В. Г. Гилев,
D. S. Vokhmyanin
Publication year - 2018
Publication title -
novye ogneupory
Language(s) - English
Resource type - Journals
ISSN - 1683-4518
DOI - 10.17073/1683-4518-2018-11-39-45
Subject(s) - tetragonal crystal system , monoclinic crystal system , isostructural , raman spectroscopy , sintering , materials science , crystallography , annealing (glass) , rare earth , pyrochlore , phase (matter) , analytical chemistry (journal) , chemistry , crystal structure , metallurgy , physics , organic chemistry , chromatography , optics
The eect of annealing and sintering temperatures on the phase transformations of ZrO 2 was studied depending on the content of REE concentrate using dierential thermal analysis, Raman spectroscopy and X -ray diraction. It is shown that the introduction of REE concentrate in an amount of more than 15 wt. % stabilizes the tetragonal phase of ZrO 2 only at temperatures below 1200 °C. A further increase in temperature leads to destabilization of the tetragonal phase with the formation of the monoclinic and cubic phases of the Ln 2 Zr 2 O 7 type isostructural compounds ( n = La, Nd, ...) with the pyrochlore structure.Ill. 8. Ref. 19. Tab. 1.