| 引用本文： |
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薛紫岳,季士渝,王瑜,谢亮.退火对 Hf1-xYxO2 体系的结构与磁性的影响[J].低温物理学报,2022,(4):304-309. [点击复制]
- XUE Ziyue,JI Shiyu,WANG Yu,XIE Liang.Effect of Annealing on the Structure and Magnetic Properties of Hf1-xYxO2 System[J].LOW TEMPERATURE PHYSICAL LETTERS,2022,(4):304-309. [点击复制]
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| 摘要: |
| 利用溶胶凝胶法制备不同掺杂浓度的 Hf1 -x Yx O2 (x =0, 0.07, 0.3, 0.5 ) 系列样品, 探究了不同退火时间对样品的结构、 形貌、 磁学性质的影响. X 射线衍射分析表明, 随着掺杂浓度的提高, 样品从单斜相逐渐转变为立方相. 掺杂浓度为x =0.07 的样品为单斜和立方的混合相, 且随着退火时间的延长, 单斜相的比例逐渐增加. 扫描电子显微镜结果表明, 样品为几十微米大小的不规则颗粒, 不同退火时间对样品形貌无显著影响. 磁性测量结果表明, 掺杂样品在室温下具有铁磁特性, 而且可以利用掺杂浓度和退火时长进行调控. 我们认为 Hf1 -x Yx O2 体系的室温铁磁性可能与 Y 掺杂导致的样品内氧空位及缺陷有关. |
| 关键词: 溶胶凝胶法, Hf1 -x Yx O2 体系, 室温铁磁性 |
| DOI： |
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| 基金项目: |
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| Effect of Annealing on the Structure and Magnetic Properties of Hf1-xYxO2 System |
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XUE Ziyue, JI Shiyu, WANG Yu, XIE Liang
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| (Department of Physics ,School of Science ,North China University of Technology ,Beijing 100144,China) |
| Abstract: |
| Hf1-xYxO2(x=0，0.07, 0.3, 0.5) samples with different doping concentrations were prepared by sol-gel method. The effect of annealing time on the structure, morphology and magnetic properties of the samples were investigated. X-ray diffraction analysis shows that with the increase of doping concentration, the sample gradually changes from monoclinic phase to cubic phase. The sample with x = 0. 07 is mixed with monoclinic and cubic phases, and with the increasing of annealing time, the proportion of monoclinic phase increases. Scanning electron microscope (SEM) results indicate that the samples are irregular particles with tens of microns. Different annealing time has no significant effect on the morphology of the samples. The magnetic measurement shows that the doped samples have ferromagnetic properties at room temperature and can be modulated by doping and annealing time. The room temperature ferromagnetism of Hf1-xYxO2 system may be related to the oxygen vacancies and defects in the samples caused by Y doping. |
| Key words: Sol-gel method, Hf1 -x Yx O2 system, Room temperature ferromagnetism |
