The Origin of Magnetic Ordering in Sr
               3
               YCo
               4
               O
               10+x

Kishida, Takayoshi; Kapetanakis, Myron D.; Yan, Jiaqiang; Sales, B. C.; Pantelides, Sokrates T.; Pennycook, Stephen J.; Chisholm, Matthew F.

doi:10.1017/s1431927616007819

Cited by 1 publication

(1 citation statement)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The oxygen-deficient perovskite Sr 3 YCo 4 O 10.5+ δ (314-SYCO) with an ordered tetragonal structure has potential applications in microwave absorbing materials, solid oxide fuel cells, and other fields owing to its room-temperature ferromagnetism ( Golosova et al, 2009 ; Marik et al, 2018 ; Istomin et al, 2003 ), orbital and charge ordering ( Khalyavin et al, 2011 ; Sheptyakov et al, 2009 ; Kishida et al, 2016 ), high electronic conductivity, and excellent activity for the oxygen-reduction reaction ( Li et al, 2011 ; Lalan et al, 2019 ). The A -site ordered (AO) and oxygen vacancy ordered (OO) tetragonal superstructure of 314-SYCO is composed of alternating octahedral CoO 6 layers and tetrahedral CoO 4.25+ δ layers stacked along the c -axis.…”

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.

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 99%