Effects of Cu Doping on the Microstructure and Electrical Properties of Sr&lt;sub&gt;3&lt;/sub&gt;YCo&lt;sub&gt;4&lt;/sub&gt;O&lt;sub&gt;10.5&lt;/sub&gt;&lt;sub&gt;+δ&lt;/sub&gt; Polycrystalline

Du, Xiao; Yu, Lan; Zhang, Bin; Song, Shi Jin; Li, Guo Fang

doi:10.4028/www.scientific.net/amr.934.80

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“…In addition, CuO, as a sintering agent, increases the content of the liquid phase during sintering, thus improving the sintering quality. Our research group first proposed that Cu doping can reduce the resistivity of 314-SYCO (Du et al, 2014). However, a thorough investigation of the effects of Cu doping on the electromagnetic characteristics of polycrystalline 314-SYCO has not yet been conducted.…”

Section: Introductionmentioning

confidence: 99%

Ordered phase transformation and Cu doping effects in room-temperature ferromagnetic Sr3YCo4O10.5+δ

Ren

Zhang

et al. 2022

Front. Chem.

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Sr3YCo4O10.5+δ (314-SYCO), with an unusual ordered structure and a high Curie temperature (Tc ≈ 335 K), is attracting increasing attention. Herein, to improve the electrical performance of 314-SYCO, Cu-doped Sr3YCo4−xCuxO10.5+δ (x = 0–0.8) ceramics were prepared using a solid-state reaction method. Systematic research was conducted on both the ordered phase transformation and the effects of Cu doping on the microstructure, electrical transport characteristics, and magnetic properties. For x = 0–0.4, the (103) and (215) planes were observed and combined with Rietveld refinement results for the X-ray diffraction data, confirming the formation of ordered tetragonal Sr3YCo4−xCuxO10.5+δ. This phase was formed with a mass gain of ∼0.8% and heat released at ∼1,042°C. With increasing Cu content, the concentration of hole carriers also increased, leading to a substantial reduction in electrical resistivity. The electrical resistivity decreased by 92–99% at 300 K. The polycrystalline materials have semiconducting behaviour with a three-dimensional Mott variable-range hopping mechanism. For the magnetic properties, a Hopkinson peak was observed at 319 K, and the Tc was approximately 321 K for x = 0. The magnetisation and Tc decreased with increasing Cu content, and a G-type antiferromagnetic-to-ferromagnetic phase transition occurred due to the spin state change for some Co3+ ions from high/intermediate spin to low/intermediate spin. These results lay the groundwork for refinement of the sintering procedure and doping parameters to enhance the performance of 314-SYCO in the context of current applications such as microwave absorbers and solid oxide fuel cell cathodes.

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Section: Introductionmentioning

confidence: 99%