@misc{ghazanfari_largescale_synthesis_2022, 
author={Ghazanfari, M.,Santhosh, A.,Vrijmoed, J.,Siemensmeyer, K.,Peters, B.,Dehnen, S.,Jerabek, P.,Thiele, G.},
title={Large-scale synthesis of mixed valence K3[Fe2S4] with high dielectric and ferrimagnetic characteristics},
year={2022},
howpublished = {journal article},
doi = {https://doi.org/10.1039/D2RA05200H},
abstract = {High yields of phase-pure K3[Fe2S4] are obtained using a fast, straight-forward, and efficient synthetic technique starting from the binary precursors K2S and FeS, and elemental sulphur. The compound indicates soft ferrimagnetic characteristics with magnetization of 15.23 A m2 kg−1 at 300 K due to the mixed valence of FeII/FeIII. 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 (κ) of around 1750 at 1 kHz, which lies within the range of well-known high-κ dielectric materials, and an ionic conductivity of 4 × 10−2 mS cm−1 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.},
note = {Online available at: \url{https://doi.org/10.1039/D2RA05200H} (DOI). Ghazanfari, M.; Santhosh, A.; Vrijmoed, J.; Siemensmeyer, K.; Peters, B.; Dehnen, S.; Jerabek, P.; Thiele, G.: Large-scale synthesis of mixed valence K3[Fe2S4] with high dielectric and ferrimagnetic characteristics. RSC Advances. 2022. vol. 12, no. 47, 30514-30521. DOI: 10.1039/D2RA05200H}}