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Large Exchange Bias, High Dielectric Constant, and Outstanding Ionic Conductivity in a Single-Phase Spin Glass
Advanced Electronic Materials ( IF 5.3 ) Pub Date : 2022-07-15 , DOI: 10.1002/aelm.202200483 Mohammad R. Ghazanfari 1 , Archa Santhosh 2 , Konrad Siemensmeyer 3 , Friederike Fuß 1 , Lennart Staab 4 , Johannes C. Vrijmoed 5 , Bertram Peters 6 , Moritz Liesegang 5 , Stefanie Dehnen 6 , Oliver Oeckler 4 , Paul Jerabek 2 , Günther Thiele 1
Advanced Electronic Materials ( IF 5.3 ) Pub Date : 2022-07-15 , DOI: 10.1002/aelm.202200483 Mohammad R. Ghazanfari 1 , Archa Santhosh 2 , Konrad Siemensmeyer 3 , Friederike Fuß 1 , Lennart Staab 4 , Johannes C. Vrijmoed 5 , Bertram Peters 6 , Moritz Liesegang 5 , Stefanie Dehnen 6 , Oliver Oeckler 4 , Paul Jerabek 2 , Günther Thiele 1
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The multigram synthesis of K2[Fe3S4] starting from K2S and FeS is presented, and its electronic and magnetic properties are investigated. The title compound obtains a defect variant of the K[Fe2Se2] structure type. Dielectric and impedance measurements indicate a dielectric constant of 1120 at 1 kHz and an outstanding ionic conductivity of 24.37 mS cm–1 at 295 K, which is in the range of the highest reported value for potential solid-state electrolytes for potassium-ion batteries. The Seebeck coefficient of the n-type conductor amounts to −60 µV K−1 at 973 K. The mismatch of the measured electrical resistivity and the predicted metal-like band structure by periodic quantum chemical calculations indicates Mott insulating behavior. Magnetometry demonstrates temperature-dependent, large exchange bias fields of 35 mT, as a consequence of the coexistence of spin glass and antiferromagnetic orderings due to the iron vacancies in the lattice. In addition, the decreasing training effects of 34% in the exchange bias are identified at temperatures lower than 20 K. These results demonstrate the critical role of iron vacancies in tuning the electronic and magnetic properties and a multifunctional material from abundant and accessible elements.
中文翻译：
单相自旋玻璃中的大交换偏压、高介电常数和出色的离子电导率
介绍了以K 2 S 和FeS 为原料合成K 2 [Fe 3 S 4 ] ，并研究了其电学和磁学性质。标题化合物获得了 K[Fe 2 Se 2 ] 结构类型的缺陷变体。介电和阻抗测量表明，在 1 kHz 时的介电常数为 1120，在 295 K 时具有 24.37 mS cm –1的出色离子电导率，这在钾离子电池潜在固态电解质的最高报告值范围内。n型导体的塞贝克系数为-60 µV K -1在 973 K。测量的电阻率和通过周期性量子化学计算预测的类金属能带结构的不匹配表明莫特绝缘行为。由于晶格中的铁空位，自旋玻璃和反铁磁有序共存，磁力测量显示出 35 mT 的温度依赖性大交换偏置场。此外，在低于 20 K 的温度下，交换偏压降低了 34% 的训练效应。这些结果证明了铁空位在调节电子和磁性以及来自丰富和可访问元素的多功能材料中的关键作用。
更新日期：2022-07-15
中文翻译：
单相自旋玻璃中的大交换偏压、高介电常数和出色的离子电导率
介绍了以K 2 S 和FeS 为原料合成K 2 [Fe 3 S 4 ] ，并研究了其电学和磁学性质。标题化合物获得了 K[Fe 2 Se 2 ] 结构类型的缺陷变体。介电和阻抗测量表明，在 1 kHz 时的介电常数为 1120，在 295 K 时具有 24.37 mS cm –1的出色离子电导率，这在钾离子电池潜在固态电解质的最高报告值范围内。n型导体的塞贝克系数为-60 µV K -1在 973 K。测量的电阻率和通过周期性量子化学计算预测的类金属能带结构的不匹配表明莫特绝缘行为。由于晶格中的铁空位，自旋玻璃和反铁磁有序共存，磁力测量显示出 35 mT 的温度依赖性大交换偏置场。此外，在低于 20 K 的温度下，交换偏压降低了 34% 的训练效应。这些结果证明了铁空位在调节电子和磁性以及来自丰富和可访问元素的多功能材料中的关键作用。
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