B-Site Fe/Re Cation-Ordering Control and Its Influence on the Magnetic Properties of Sr<sub>2</sub>FeReO<sub>6</sub> Oxide Powders
Double-perovskite oxide Sr<sub>2</sub>FeReO<sub>6</sub> (SFRO) powders have promising applications in spintronics due to their half-metallicity and high Curie temperature. However, their magnetic properties suffer from the existence of anti-site defects (ASDs). Here, we repor...
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MDPI AG
2022-10-01
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| Series: | Nanomaterials |
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| author | Zhuowei Wang Qingkai Tang Zhiwei Wu Kang Yi Jiayuan Gu Xinhua Zhu |
| author_facet | Zhuowei Wang Qingkai Tang Zhiwei Wu Kang Yi Jiayuan Gu Xinhua Zhu |
| author_sort | Zhuowei Wang |
| collection | DOAJ |
| description | Double-perovskite oxide Sr<sub>2</sub>FeReO<sub>6</sub> (SFRO) powders have promising applications in spintronics due to their half-metallicity and high Curie temperature. However, their magnetic properties suffer from the existence of anti-site defects (ASDs). Here, we report on the synthesis of SFRO powders by the sol–gel process. The B-site cationic ordering degree (<i>η</i>) and its influence on magnetic properties are investigated. The results demonstrate that the <i>η</i> value is well controlled by the annealing temperature, which is as high as 85% when annealing at 1100 °C. However, the annealing atmospheres (e.g., N<sub>2</sub> or Ar) have little effect on the <i>η</i> value. At room temperature, the SFRO powders crystallize in a tetragonal crystal structure (space group <i>I</i>4/<i>m</i>). They have a relatively uniform morphology and the molar ratios of Sr, Fe, and Re elements are close to 2:1:1. XPS spectra identified that Sr, Fe, and Re elements presented as Sr<sup>2+</sup>, Fe<sup>3+</sup>, and Re<sup>5+</sup> ions, respectively, and the O element presented as O<sup>2-</sup>. The SFRO samples annealed at 1100 °C in N<sub>2</sub>, exhibiting the highest saturation magnetization (<i>M</i><sub>S</sub> = 2.61 <i>μ</i><sub>B</sub>/f.u. at 2 K), which was ascribed to their smallest ASD content (7.45%) with an anti-phase boundary-like morphology compared to those annealed at 1000 °C (ASDs = 10.7%) or 1200 °C (ASDs = 10.95%). |
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| language | English |
| last_indexed | 2024-03-09T19:40:43Z |
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| spelling | doaj.art-b534124d5a494deaa6adb592449a20042023-11-24T01:40:49ZengMDPI AGNanomaterials2079-49912022-10-011220364010.3390/nano12203640B-Site Fe/Re Cation-Ordering Control and Its Influence on the Magnetic Properties of Sr<sub>2</sub>FeReO<sub>6</sub> Oxide PowdersZhuowei Wang0Qingkai Tang1Zhiwei Wu2Kang Yi3Jiayuan Gu4Xinhua Zhu5National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, ChinaNational Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, ChinaNational Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, ChinaNational Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, ChinaNational Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, ChinaNational Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, ChinaDouble-perovskite oxide Sr<sub>2</sub>FeReO<sub>6</sub> (SFRO) powders have promising applications in spintronics due to their half-metallicity and high Curie temperature. However, their magnetic properties suffer from the existence of anti-site defects (ASDs). Here, we report on the synthesis of SFRO powders by the sol–gel process. The B-site cationic ordering degree (<i>η</i>) and its influence on magnetic properties are investigated. The results demonstrate that the <i>η</i> value is well controlled by the annealing temperature, which is as high as 85% when annealing at 1100 °C. However, the annealing atmospheres (e.g., N<sub>2</sub> or Ar) have little effect on the <i>η</i> value. At room temperature, the SFRO powders crystallize in a tetragonal crystal structure (space group <i>I</i>4/<i>m</i>). They have a relatively uniform morphology and the molar ratios of Sr, Fe, and Re elements are close to 2:1:1. XPS spectra identified that Sr, Fe, and Re elements presented as Sr<sup>2+</sup>, Fe<sup>3+</sup>, and Re<sup>5+</sup> ions, respectively, and the O element presented as O<sup>2-</sup>. The SFRO samples annealed at 1100 °C in N<sub>2</sub>, exhibiting the highest saturation magnetization (<i>M</i><sub>S</sub> = 2.61 <i>μ</i><sub>B</sub>/f.u. at 2 K), which was ascribed to their smallest ASD content (7.45%) with an anti-phase boundary-like morphology compared to those annealed at 1000 °C (ASDs = 10.7%) or 1200 °C (ASDs = 10.95%).https://www.mdpi.com/2079-4991/12/20/3640double-perovskite oxidesSr<sub>2</sub>FeReO<sup>6</sup> powderssol–gel processanti-site defectsmagnetic propertiesmicrostructural characterization |
| spellingShingle | Zhuowei Wang Qingkai Tang Zhiwei Wu Kang Yi Jiayuan Gu Xinhua Zhu B-Site Fe/Re Cation-Ordering Control and Its Influence on the Magnetic Properties of Sr<sub>2</sub>FeReO<sub>6</sub> Oxide Powders Nanomaterials double-perovskite oxides Sr<sub>2</sub>FeReO<sup>6</sup> powders sol–gel process anti-site defects magnetic properties microstructural characterization |
| title | B-Site Fe/Re Cation-Ordering Control and Its Influence on the Magnetic Properties of Sr<sub>2</sub>FeReO<sub>6</sub> Oxide Powders |
| title_full | B-Site Fe/Re Cation-Ordering Control and Its Influence on the Magnetic Properties of Sr<sub>2</sub>FeReO<sub>6</sub> Oxide Powders |
| title_fullStr | B-Site Fe/Re Cation-Ordering Control and Its Influence on the Magnetic Properties of Sr<sub>2</sub>FeReO<sub>6</sub> Oxide Powders |
| title_full_unstemmed | B-Site Fe/Re Cation-Ordering Control and Its Influence on the Magnetic Properties of Sr<sub>2</sub>FeReO<sub>6</sub> Oxide Powders |
| title_short | B-Site Fe/Re Cation-Ordering Control and Its Influence on the Magnetic Properties of Sr<sub>2</sub>FeReO<sub>6</sub> Oxide Powders |
| title_sort | b site fe re cation ordering control and its influence on the magnetic properties of sr sub 2 sub fereo sub 6 sub oxide powders |
| topic | double-perovskite oxides Sr<sub>2</sub>FeReO<sup>6</sup> powders sol–gel process anti-site defects magnetic properties microstructural characterization |
| url | https://www.mdpi.com/2079-4991/12/20/3640 |
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