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首页> 外文期刊>Journal of materials science >Effects of alkaline-earth dopants on structural, optical and magnetic properties of Bi_2Fe_4O_9 powders
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Effects of alkaline-earth dopants on structural, optical and magnetic properties of Bi_2Fe_4O_9 powders

机译：碱土掺杂对Bi_2Fe_4O_9粉体结构，光学和磁性的影响

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摘要

The pure Bi_2Fe_4O_9 and Bi_(2 (1−x)) A_(2x)Fe_4O_9 (A = Ca, Ba, x = 0.03) powders are synthesized via a modified solid-state reaction method to study the effects of alkaline-earth metal ions doping on crystal structural, optical and magnetic properties. Both X-ray diffraction and Raman spectroscopy data reveal that all the powders are Mullite-type Bi_2Fe_4O_9 orthorhombic single phase without any impurities. Much greater structural distortion in Bi_(1.94)Ba_(0.06)Fe_4O_9 than that of Bi_(1.94)Ca_(0.06)Fe_4O_9 is observed. The chemical compositions of Ba~(2+) and Ca~(2+) doped powders have been investigated with energy dispersive X-ray spectroscopy (EDS). X-ray photoelectron spectroscopy results indicate that oxygen vacancies could be found in all doped powders. The ratio of Fe~(2+) in the total Fe ions is almost unchanged by Ca doping and increases a little with Ba substitution. Compared with that of pure Bi_2Fe_4O_(9,) the band gap values decrease slightly in Bi_(1.94)Ca_(0.06)Fe_4O_9 but drop dramatically in Bi_(1.94)Ba_(0.06)Fe_4O_9. A clear and obvious ferromagnetic behavior is found in Bi_(1.94)Ba_(0.06)Fe_4O_9 at 10 K. However, Bi_(1.94)Ca_(0.06)Fe_4O_9 shows a weak ferromagnetism with enhanced magnetization and Bi_2Fe_4O_9 exhibits antiferromagnetism with a linear M-H relationship. The varied bandgap and magnetization resulting from the alkaline-earth metal ionic species are discussed in terms of structural distortion due to the ionic radius size effect.
机译：通过改进的固态反应方法合成纯Bi_2Fe_4O_9和Bi_（2（1-x））A_（2x）Fe_4O_9（A = Ca，Ba，x = 0.03）粉末，以研究碱土金属离子的影响掺杂晶体结构，光学和磁性。 X射线衍射和拉曼光谱数据均表明，所有粉末均为莫来石型Bi_2Fe_4O_9正交单相，无任何杂质。与Bi_（1.94）Ca_（0.06）Fe_4O_9相比，Bi_（1.94）Ba_（0.06）Fe_4O_9中观察到更大的结构变形。利用能量色散X射线能谱（EDS）研究了Ba〜（2+）和Ca〜（2+）掺杂粉末的化学成分。 X射线光电子能谱结果表明，在所有掺杂粉末中都可以发现氧空位。 Ca掺杂后，Fe〜（2+）在总Fe离子中的比例几乎不变，而随着Ba的取代而略有增加。与纯Bi_2Fe_4O_（9）相比，Bi_（1.94）Ca_（0.06）Fe_4O_9的带隙值略有下降，而Bi_（1.94）Ba_（0.06）Fe_4O_9的带隙值则显着下降。 Bi_（1.94）Ba_（0.06）Fe_4O_9在10K处发现了清晰明显的铁磁行为。然而，Bi_（1.94）Ca_（0.06）Fe_4O_9显示出弱的铁磁性并具有增强的磁化强度，Bi_2Fe_4O_9表现出具有线性M-H关系的反铁磁性。讨论了由于离子半径大小效应引起的结构畸变，由碱土金属离子物质产生的带隙和磁化强度的变化。

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  • 来源
    《Journal of materials science》 |2017年第21期|15797-15803|共7页
  • 作者

    Wang Geming; Lin Hai; Lin Can; Liu Shutong; Wang Shenggao; Deng Quanrong;

  • 作者单位

    School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan, China,Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, Wuhan Institute of Technology, Wuhan, China;

    School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan, China;

    School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan, China;

    School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan, China;

    School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan, China,Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, Wuhan Institute of Technology, Wuhan, China;

    School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan, China,Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, Wuhan Institute of Technology, Wuhan, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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