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首页> 外文期刊>Physica, B. Condensed Matter >Annealing effects on the ferromagnetism of Ce0.97Co0.03O2-delta compounds
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Annealing effects on the ferromagnetism of Ce0.97Co0.03O2-delta compounds

机译：退火对Ce0.97Co0.03O2-δ化合物铁磁性的影响

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Diluted magnetic oxide of Ce0.97Co0.03O2-delta powder was synthesized by standard solid-state reaction method. Oxidized or reduced samples were obtained via O-2 or Ar/H-2 annealing, respectively. Magnetic investigations found that the as sintered Ce0.97Co0.03O2-delta is ferromagnetic at room temperature. The saturation magnetic moments (M-S) are highly enhanced by Ar/H-2 annealing, while sharply diminished by O-2 treatments. X-ray photoelectron spectroscopy (XPS) measurements show that Ce4+ ions are partially reduced to Ce3+ with additional oxygen vacancies (V-O) being introduced by Ar/H-2 annealing. The increase of V-O by Ar/H-2 annealing is further proved by Raman spectra in which a new Raman scattering peak appearing at the frequency of 465 cm(-1). This fact contributes to the enhanced ferromagnetism observed in reduced Ce0.97Co0.03O2-delta. On the other hand, V-O density is reduced via O-2 annealing and thus leading to a decreased M-S. On all accounts M-S is found to be in direct ratio-dependent on V-O density in Ce0.97Co0.03O2-delta. The experimental results are well consistent with the F-center mediated ferromagnetism mechanism recently found in some transitional metal (TM) doped oxides, and thus is very important in understanding the mechanism of the ferromagnetism (FM) origin in many TMs-doped insulating oxides. (C) 2010 Elsevier B.V. All rights reserved.
机译：通过标准固相反应法合成了Ce0.97Co0.03O2-δ粉末的稀磁氧化物。氧化或还原的样品分别通过O-2或Ar / H-2退火获得。磁性研究发现，烧结的Ce0.97Co0.03O2-δ在室温下是铁磁性的。 Ar / H-2退火可大大增强饱和磁矩（M-S），而O-2处理则可大大降低饱和磁矩。 X射线光电子能谱（XPS）测量表明，通过Ar / H-2退火引入了额外的氧空位（V-O），Ce4 +离子被部分还原为Ce3 +。拉曼光谱进一步证明了Ar / H-2退火过程中V-O的增加，其中一个新的拉曼散射峰出现在465 cm（-1）的频率上。这一事实有助于在降低的Ce0.97Co0.03O2-δ中观察到增强的铁磁性。另一方面，V-O密度通过O-2退火而降低，从而导致M-S降低。总而言之，发现M-S与Ce0.97Co0.03O2-δ中的V-O密度成正比关系。实验结果与最近在某些过渡金属（TM）掺杂的氧化物中发现的F中心介导的铁磁性机理非常吻合，因此对于理解许多掺有TMs的绝缘氧化物中铁磁性（FM）的形成机理非常重要。 （C）2010 Elsevier B.V.保留所有权利。

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