Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Analysis of Phase Diagram of CaO-CoOx-ErOy and Crystal Structure of Perovskite (Ca3-xErx)Co2O6-z Solid Solution

The co-first author
Version 1 : Received: 19 May 2023 / Approved: 22 May 2023 / Online: 22 May 2023 (09:38:18 CEST)

A peer-reviewed article of this Preprint also exists.

Wang, H.; Ning, H.; Fan, Z.; Liu, G. Analysis of Phase Diagram of CaO-CoOx-ErOy and Crystal Structure of Perovskite (Ca3−xErx)Co2O6−z Solid Solution. Energies 2023, 16, 4958. Wang, H.; Ning, H.; Fan, Z.; Liu, G. Analysis of Phase Diagram of CaO-CoOx-ErOy and Crystal Structure of Perovskite (Ca3−xErx)Co2O6−z Solid Solution. Energies 2023, 16, 4958.

Abstract

In this work, a series of compounds in the CaO-½Er2O3-CoOz ternary oxide system were synthesized in air at 885℃ using high temperature solid-phase synthesis method. Phase boundary of each solid solution region in the CaO-½Er2O3-CoOz system was determined by X-ray powder diffraction technique. The phase diagram of the CaO-½Er2O3-CoOz system at 885℃ includes three series of ternary oxide solid solutions : (Ca3-xErx)Co4O9-z (0≤x≤0.9), (Ca3-xErx)Co2O6-z (0≤x≤1.25) and (Er1-xCax)CoO3-z (0≤x≤0.33). Four three-phase regions and five solid solution tie-line regions were obtained. The structure of perovskite solid solution (Ca3-xErx)Co2O6-z has been analyzed by Rietveld refinements. With the increase of Er content, the cell parameters of (Ca3-xErx)Co2O6-z exhibit an decreasing trend in a and b directions and an increasing trend in c direction.

Keywords

Phase diagram of CaO-CoOx-ErOy system; Thermoelectric oxide system; Perovskite and its derived structures; Structure for (Ca3-xErx)Co2O6-z

Subject

Chemistry and Materials Science, Materials Science and Technology

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