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首页> 外文期刊>RSC Advances >XRD, HRTEM, Raman and magnetic studies on chemically prepared nanocrystalline Fe-doped gadolinium oxide (Gd1.90Fe0.10O3-delta) annealed in vacuum
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XRD, HRTEM, Raman and magnetic studies on chemically prepared nanocrystalline Fe-doped gadolinium oxide (Gd1.90Fe0.10O3-delta) annealed in vacuum

机译：在真空中退火的化学制备的纳米晶Fe掺杂的氧化钆（GD1.90FE0.10O3-DELTA）的XRD，HRTEM，拉曼和磁性研究

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Nanoparticles of Fe-doped gadolinium oxide (Gd1.90Fe0.10O3-delta) are prepared by a co-precipitation method. To obtain the desired nanocrystalline phase and to enhance the oxygen vacancy, the as prepared sample is annealed at 700 degrees C for 6 h in vacuum. The pure crystallographic phase is confirmed by Rietveld analysis of the X-ray diffraction (XRD) pattern. High resolution transmission electron microscopy (HRTEM) studies and Raman spectroscopy of the doped sample observed at room temperature also ruled out the presence of any unwanted impurity phase in the sample. XRD, HRTEM and Raman spectra of the sample confirmed the complete substitution of Fe-ions in the lattice of gadolinium oxide. The static magnetic measurements are carried out at different temperatures from 300 K down to 5 K by using a superconducting quantum interference device (SQUID) magnetometer. The onset of nonlinearity in the magnetization (M) vs. field (H) curve recorded at similar to 20 K confirms the presence of magnetic ordering at and below similar to 20 K. A clear hysteresis loop with a high value of magnetization (similar to 120.1 emu g(-1)) is observed at 5 K at an applied field of similar to 5 T. The lack of saturation in the hysteresis loop at and below similar to 20 K and good fitting of the M-T curve below similar to 50 K by 3D spin wave model and Curie-Weiss law indicates the coexistence of paramagnetic (PM) and ferromagnetic (FM) phases. The observed magnetic phase transition is attributed to the substitution of Fe-ions in the Gd2O3 lattice, which is explained by oxygen vacancy mediated bound magnetic polaron model.
机译：通过共沉淀法制备Fe掺杂的Fe掺杂的氧化钆（GD1.90FE0.10O3-DELTA）。为了获得所需的纳米晶相并增强氧空位，如制备的样品在700℃下以700℃退火6小时。通过RIETVELD X射线衍射（XRD）图案的RIETVELD分析证实了纯晶状体相。在室温下观察到的掺杂样品的高分辨率透射电子显微镜（HRTEM）研究和拉曼光谱也排除了样品中存在任何不需要的杂质相的存在。样品的XRD，HRTEM和拉曼光谱证实了在氧化钆晶格中完全取代Fe离子。通过使用超导量子干涉装置（鱿鱼）磁力计，静态磁测量在从300k到5k的不同温度下进行。在类似于20k的磁化强度（m）与场（h）曲线中的非线性发作确认了在类似于20k的下方磁性排序的存在。一种具有高磁化值的透明滞后环（类似于120.1 EMU G（-1）在类似于5吨的施加场的5 k处观察到。滞后回路缺乏静止和下面类似于20 k和低于50 k的MT曲线的良好拟合通过3D旋转波模型和Curie-Weiss Law表示顺磁（PM）和铁磁性（FM）阶段的共存。所观察到的磁相转变归因于GD2O3晶格中的Fe离子取代，其通过氧空位介导的结合磁极化模型解释。

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  • 来源
    《RSC Advances》 |2016年第8期|共10页
  • 作者

    Sarkar B. J.; Deb A. K.; Chakrabarti P. K.;

  • 作者单位

    Univ Burdwan Dept Phys Solid State Res Lab Burdwan 713104 W Bengal India;

    Raiganj Univ Dept Phys Uttar Dinajpur 733134 WB India;

    Univ Burdwan Dept Phys Solid State Res Lab Burdwan 713104 W Bengal India;

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