Phase Transformations in Calcium-Substituted Lanthanum Ferrite

Authors

Patrick M. Price, Boise State University
Ellen Rabenberg, Boise State University
David Thomsen, Boise State University
Scott Misture, Alfred University
Darryl P. Butt, Boise State UniversityFollow

Document Type

Article

Publication Date

7-2014

Abstract

Phase equilibria in the La_1−xCa_xFeO_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 LaFeO₃–CaFeO_2.5 phase diagram is presented that is based on these analyses combined with data available in the open literature.

Publication Information

Price, Patrick M.; Rabenberg, Ellen; Thomsen, David; Misture, Scott; and Butt, Darryl P.. (2014). "Phase Transformations in Calcium-Substituted Lanthanum Ferrite". Journal of the American Ceramic Society, 97(7), 2241-2248. https://doi.org/10.1111/jace.12891