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Phase Equilibria in the ZrO 2 –MgO–MnO x System
Author(s) -
Pavlyuchkov Dmytro,
Dilner David,
Savinykh Galina,
Fabrichnaya Olga
Publication year - 2016
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/jace.14327
Subject(s) - spinel , isothermal process , phase diagram , solid solution , bar (unit) , phase (matter) , differential thermal analysis , materials science , enstatite , scanning electron microscope , mineralogy , analytical chemistry (journal) , crystallography , thermodynamics , chemistry , metallurgy , diffraction , geology , composite material , physics , oceanography , meteorite , organic chemistry , chromatography , astronomy , optics , chondrite
Phase equilibria were experimentally investigated in the MgO–MnO x and the ZrO 2 –MgO–MnO x systems for different oxygen partial pressures by powder X‐ray diffractometry, scanning electron microscopy, and differential thermal analysis. The formation of two compositionally and structurally different β‐spinel solid solutions was observed in the MgO–MnO x system in air in the temperature interval 1473–1713 K. Isothermal sections of the ZrO 2 –MgO–MnO x phase diagram were constructed for air conditions ( P O 2= 0.21 bar) at 1913, 1813, 1713, 1613, and 1523 K. In addition, isothermal sections at 1913 and 1523 K were constructed forP O 2= 10 −4 bar. The β‐spinel and halite phases of the MgO–MnO x system were found to dissolve up to 2 and 5 mol% ZrO 2 . A continuous c ‐ZrO 2 solid solution forms between the boundary ZrO 2 –MnO x and ZrO 2 –MgO systems. It stabilizes in the ZrO 2 –MgO–MnO x system down to at least 1613 K in air and down to 1506 K atP O 2= 10 −4 bar.