Analysis of Phase Diagram of CaO-CoO x -ErO y and Crystal Structure of Perovskite (Ca 3−x Er x )Co 2 O 6−z Solid Solution

Haocheng Wang, Haoming Ning, Zhenjun Fan () and Guangyao Liu ()
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Haocheng Wang: School of Science, China University of Geosciences Beijing, Beijing 100083, China
Haoming Ning: School of Science, China University of Geosciences Beijing, Beijing 100083, China
Zhenjun Fan: School of Science, China University of Geosciences Beijing, Beijing 100083, China
Guangyao Liu: Institute of Earth Sciences, China University of Geosciences Beijing, Beijing 100083, China

Energies, 2023, vol. 16, issue 13, 1-14

Abstract: In this work, a series of compounds in the CaO-CoO x -ErO y ternary oxide system were synthesized in air at 885 °C, using a high temperature solid-phase synthesis method. The phase boundary of each solid solution region in the CaO-CoO x -ErO y system was determined by X-ray powder diffraction techniques. The phase diagram of the CaO-CoO x -ErO y system at 885 °C includes three series of ternary oxide solid solutions: (Ca 3−x Er x )Co 4 O 9−z (0 ≤ x ≤ 0.9), (Ca 3−x Er x )Co 2 O 6−z (0 ≤ x ≤ 1.25), and (Er 1−x Ca x )CoO 3−z (0 ≤ x ≤ 0.33). Four three-phase regions and five solid solution tie-line regions were obtained. The structure of the perovskite solid solution (Ca 3−x Er x )Co 2 O 6−z has been analyzed by Rietveld refinements. With the increase of Er content, the cell parameters of (Ca 3−x Er x )Co 2 O 6−z exhibit a decreasing trend in a and b directions and an increasing trend in c direction. A brief comparison of the phase diagrams of the CaO-CoO x -RO y (R = La, Dy, and Er) systems in air at 885 °C is provided.

Keywords: phase diagram of the CaO-CoO x -ErO y system; thermoelectric oxide system; perovskite and its derived structures; structure of (Ca 3?x Er x )Co 2 O 6?z (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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