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Phase Relation Studies in the ZrO 2 –CeO 2 –La 2 O 3 System at 1500°C
Author(s) -
Andrievskaya Elena R.,
Kornienko Oksana A.,
Sayir Ali,
Vasylkiv Oleg O.,
Sakka Yoshio
Publication year - 2011
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2010.04316.x
Subject(s) - relation (database) , phase (matter) , materials science , mineralogy , chemistry , computer science , organic chemistry , database
The phase relations in the ZrO 2 –CeO 2 –La 2 O 3 ternary system at 1500°C were studied by X‐ray diffraction (XRD), petrography, and scanning electron microscopy in the overall concentration range. The samples of different compositions have been prepared from nitrate acid solutions by evaporation, drying, and calcinations at 1100° and 1500°C. The solid solutions based on various polymorphous forms of constituent phases and ordered phase of La 2 Zr 2 O 7 were revealed in the system. No new phases were found. The isothermal section of the phase diagram for the ZrO 2 –CeO 2 –La 2 O 3 system has been developed. It was established that in the ternary ZrO 2 –CeO 2 –La 2 O 3 system there exist fields of solid solutions based on hexagonal (A) modification of La 2 O 3 , monoclinic (M), and tetragonal (T) crystal modifications of ZrO 2 , cubic modification of CeO 2 with fluorite‐type structure (F), as well as pyrochlore type ordered phase of cubic symmetry La 2 Zr 2 O 7 (Py). The refined lattice parameters of the unit cells for solid solutions and microstructures of the definite field of compositions for the systems were determined.