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Phase Transformations in Calcium‐Substituted Lanthanum Ferrite
Author(s) -
Price Patrick M.,
Rabenberg Ellen,
Thomsen David,
Misture Scott T.,
Butt Darryl P.
Publication year - 2014
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.12891
Subject(s) - thermogravimetric analysis , differential scanning calorimetry , lanthanum , orthorhombic crystal system , materials science , phase diagram , scanning electron microscope , analytical chemistry (journal) , perovskite (structure) , partial pressure , phase (matter) , ferrite (magnet) , chemistry , thermodynamics , crystallography , crystal structure , oxygen , inorganic chemistry , physics , organic chemistry , chromatography , composite material
Phase equilibria in the La 1− x C a x FeO 3−δ (LCF) system were assessed at temperatures below 1350°C in both simulated air and argon atmospheres using a combination of differential scanning calorimetry, thermogravimetric analysis, scanning electron microscopy, and high‐temperature X‐ray diffraction. The solubility limit of Ca in the perovskite structure was determined to be 38% A‐site substitution. A high‐temperature orthorhombic to rhombohedral transition was identified and the dependence on oxygen partial pressure and effect on thermal expansion were characterized. A partial, pseudobinary LaFeO 3 –CaFeO 2.5 phase diagram is presented that is based on these analyses combined with data available in the open literature.