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Oxygen pressure annealing enhances the B-site ordering degree of double perovskite La2CoMnO6 ceramics

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Abstract

The ordering and arrangement of atoms in double perovskite structures play a crucial role in determining their electrical and magnetic properties. In this groundbreaking study, we conducted thermogravimetric-differential scanning calorimetry analysis on the La2CoMnO6 (LCMO) raw material, shedding light on the remarkable oxygen absorption process that occurs during the phase formation of LCMO. Therefore, LCMO ceramics with double perovskite structure were synthesized by solid-state reaction combined with oxygen pressure annealing (1200 °C/10 h/Po2 = 0.15 MPa). The structure and properties of the samples before and after oxygen pressure annealing (OPA) were characterized using X-ray diffraction with Rietveld refinement fitting, X-ray photoelectron spectroscopy, resistivity, dielectric and magnetic measurements. Subsequently, we thoroughly explored the influence of the degree of B-site (Co/Mn) ordering on the electrical and magnetic properties of the samples. The results show that the Co2+/Mn4+ content of OPA-LCMO is increased, the fraction of the B-site ordering phase (P21/n) increased by 30%, the magnetization is increased by 7.5 emu/g and the Curie temperature is increased to 216 K with the increase of Co2+–O–Mn4+ arrangement. At the same time, due to the decrease of oxygen vacancy and disordering phase (Pbnm), the carrier mobility of OPA-LCMO is reduced, and the resistivity (T = 300 K) is increased by 20 times. This comprehensive study sheds light on the intricate relationship between OPA, B-site ordering degree, and the resulting magnetic and electrical properties of double perovskite materials. These findings significantly contribute to our understanding and pave the way for the improved design and development of advanced double perovskite materials.

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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Funding

The project was supported by the National Natural Science Foundation of China (Grant Nos. 51962017 and 51462017).

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Contributions

This study was a part of the master’s project undertaken by XW. The manuscript was written through the contributions of all authors. Data curation, investigation, methodology, formal analysis, validation, electrical and magnetic characterization, writing original draft, writing review and editing: XW. XRD measurements, review, and editing: HS. XPS data processing: CY. R-T measurements and data processing: HW, CZ. Project administration, supervision, and discussions: LY. All authors have approved the final version of the manuscript.

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Correspondence to Lan Yu.

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Wang, X., Song, H., Yang, C. et al. Oxygen pressure annealing enhances the B-site ordering degree of double perovskite La2CoMnO6 ceramics. J Mater Sci: Mater Electron 34, 2157 (2023). https://doi.org/10.1007/s10854-023-11559-4

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  • DOI: https://doi.org/10.1007/s10854-023-11559-4

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