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具有高介电和亚铁磁性特性的混合价态K[FeS]的大规模合成。

Large-scale synthesis of mixed valence K[FeS] with high dielectric and ferrimagnetic characteristics.

作者信息

Ghazanfari Mohammad R, Santhosh Archa, Vrijmoed Johannes C, Siemensmeyer Konrad, Peters Bertram, Dehnen Stefanie, Jerabek Paul, Thiele Günther

机构信息

Fachbereich Biologie, Chemie, Pharmazie, Freie Universität Berlin Fabeckstr. 34-36 14195 Berlin Germany

Institute of Hydrogen Technology, Helmholtz-Zentrum Hereon Max-Planck Straße 1 21502 Geesthacht Germany.

出版信息

RSC Adv. 2022 Oct 26;12(47):30514-30521. doi: 10.1039/d2ra05200h. eCollection 2022 Oct 24.

DOI:10.1039/d2ra05200h
PMID:36337975
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9597588/
Abstract

High yields of phase-pure K[FeS] are obtained using a fast, straight-forward, and efficient synthetic technique starting from the binary precursors KS and FeS, and elemental sulphur. The compound indicates soft ferrimagnetic characteristics with magnetization of 15.23 A m kg at 300 K due to the mixed valence of Fe/Fe. Sintering at different temperatures allows the manipulation of the microstructure as well as the ratio of grains to grain boundaries. This results in a variation of dielectric and impedance properties. Samples sintered at 923 K demonstrate a dielectric constant () of around 1750 at 1 kHz, which lies within the range of well-known high- dielectric materials, and an ionic conductivity of 4 × 10 mS cm at room temperature. The compound has an optical band gap of around 2.0 eV, in agreement with tailored quantum chemical calculations. These results highlight its potential as a material comprising non-toxic and abundant elements for electronic and magnetic applications.

摘要

通过一种快速、直接且高效的合成技术，从二元前驱体KS、FeS和元素硫出发，可获得高产率的纯相K[FeS]。由于Fe/Fe的混合价态，该化合物在300 K时表现出软亚铁磁性特征，磁化强度为15.23 A m kg。在不同温度下烧结可控制微观结构以及晶粒与晶界的比例。这导致介电和阻抗特性发生变化。在923 K烧结的样品在1 kHz时的介电常数约为1750，处于著名的高介电材料范围内，室温下的离子电导率为4×10 mS cm。该化合物的光学带隙约为2.0 eV，与定制的量子化学计算结果一致。这些结果突出了其作为一种包含无毒且丰富元素的材料在电子和磁性应用方面的潜力。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/916c/9597588/7577bc901108/d2ra05200h-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/916c/9597588/514582d8a309/d2ra05200h-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/916c/9597588/02e94cd0c0a8/d2ra05200h-s1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/916c/9597588/3e89c34ed114/d2ra05200h-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/916c/9597588/b7eb9c4f8645/d2ra05200h-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/916c/9597588/15336ebb0998/d2ra05200h-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/916c/9597588/afad2dea3776/d2ra05200h-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/916c/9597588/15559a784abd/d2ra05200h-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/916c/9597588/7577bc901108/d2ra05200h-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/916c/9597588/514582d8a309/d2ra05200h-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/916c/9597588/02e94cd0c0a8/d2ra05200h-s1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/916c/9597588/3e89c34ed114/d2ra05200h-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/916c/9597588/b7eb9c4f8645/d2ra05200h-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/916c/9597588/15336ebb0998/d2ra05200h-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/916c/9597588/afad2dea3776/d2ra05200h-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/916c/9597588/15559a784abd/d2ra05200h-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/916c/9597588/7577bc901108/d2ra05200h-f7.jpg

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