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Influence of charge disproportionation on microwave characteristics of Zn-Nd substituted Sr-hexaferrites

机译：电荷歧化对Zn-Nd取代Sr-六价铁氧体微波特性的影响

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摘要

Sr(Zn,Nd)(x)Fe12-xO19 (0.0x1.0) nanohexaferrites (NHFs) were obtained using citrate sol-gel approach. XRD and FE-SEM analysis were performed to confirm the formation of Sr M-type hexaferrite. Main electrodynamics characteristics (frequency dependences of real and imaginary parts of the permittivity and permeability) were measured in the range 5-18GHz (region of the natural ferromagnetic resonance). Permittivity and permeability data correlates well. All samples were characterized by peak on the frequency dependences due to electrical and magnetic losses respectively. However, for compounds with x=0.1 and 0.9 we observed second peak (at 14-15GHz). This was explained by double oxidation state for iron ions (Fe3+/Fe4+). Presence of the Fe4+ ions was due to heterovalent Zn2+ substitution. Absence of the second peak for compounds x=0.3; 0.5 and 0.7 was explained by charge disproportionation (according to the following scheme: 2Fe(4+)=Fe3++Fe5+) under the influence of the crystal field energy. It was demonstrated that modification of crystal and magnetic structures by heterovalent substitution leads to transformation the microwave characteristics (reflection losses).
机译：使用柠檬酸溶胶-凝胶法获得了Sr（Zn，Nd）（x）Fe12-xO19（0.0x1.0）纳米六价铁酸盐（NHFs）。进行XRD和FE-SEM分析以确认Sr M型六方铁氧体的形成。在5-18GHz（自然铁磁共振区域）范围内测量了主要的电动力学特性（介电常数和磁导率的实部和虚部与频率的关系）。介电常数和磁导率数据具有良好的相关性。所有样品的特征在于分别归因于电损耗和磁损耗的峰值频率依赖性。但是，对于x = 0.1和0.9的化合物，我们观察到了第二个峰（在14-15GHz）。铁离子（Fe3 + / Fe4 +）的双重氧化态可以解释这一点。 Fe4 +离子的存在是由于杂价Zn2 +取代。化合物x ＝ 0.3的第二个峰不存在； 0.5和0.7是通过在晶体场能量的影响下的电荷歧化（按照以下方案：2Fe（4 +）= Fe3 ++ Fe5 +）解释的。已证明通过异价取代对晶体和磁性结构的修饰导致微波特性的转变（反射损耗）。

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  • 来源
    《Journal of materials science》 |2019年第7期|6776-6785|共10页
  • 作者

    Almessiere M. A.; Genc F.; Sozeri H.; Baykal A.; Trukhanov S. V; Trukhanov A. V;

  • 作者单位

    Imam Abdulrahman Bin Faisal Univ, IRMC, Dept Nanomed, POB 34221, Dammam, Saudi Arabia|Imam Abdulrahman Bin Faisal Univ, Coll Sci, Dept Phys, POB 1982, Dammam 31441, Saudi Arabia;

    Natl Metrol Inst, TUBITAK UME, POB 54, TR-41470 Gebze, Kocaeli, Turkey;

    Natl Metrol Inst, TUBITAK UME, POB 54, TR-41470 Gebze, Kocaeli, Turkey;

    Imam Abdulrahman Bin Faisal Univ, IRMC, Dept Nanomed, POB 34221, Dammam, Saudi Arabia;

    NAS Belarus, SSPA Sci & Pract Mat Res Ctr, Minsk 220072, BELARUS|South Ural State Univ, Chelyabinsk 454080, Russia|Natl Univ Sci & Technol MISiS, Moscow 119049, Russia;

    NAS Belarus, SSPA Sci & Pract Mat Res Ctr, Minsk 220072, BELARUS|South Ural State Univ, Chelyabinsk 454080, Russia|Natl Univ Sci & Technol MISiS, Moscow 119049, Russia;

  • 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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