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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

Author

Listed:
  • Haocheng Wang

    (School of Science, China University of Geosciences Beijing, Beijing 100083, China
    These authors contributed equally to this work.)

  • Haoming Ning

    (School of Science, China University of Geosciences Beijing, Beijing 100083, China
    These authors contributed equally to this work.)

  • 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)

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.

Suggested Citation

  • Haocheng Wang & Haoming Ning & Zhenjun Fan & Guangyao Liu, 2023. "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," Energies, MDPI, vol. 16(13), pages 1-14, June.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:13:p:4958-:d:1179703
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