%0 journal article
%@ 0020-1669
%A Ghazanfari, M.R.,Siemensmeyer, K.,Santhosh, A.,Vrijmoed, J.C.,Tallu, M.,Dehnen, S.,Jerabek, P.,Thiele, G.

%D 2023
%J Inorganic Chemistry
%N 38
%P 15358–15366 
%R doi:10.1021/acs.inorgchem.3c00008
%T Low-Cost, Multifunctional, and Sustainable Sodium Sulfido Ferrate(II)
%U https://doi.org/10.1021/acs.inorgchem.3c00008
38 
%X We introduce Na2[Fe3S4], comprising anionic layers, synthesized by a simple and straightforward solid-state method based on the fusion of binary sulfides of abundant sodium and iron. The structure crystallizes in a trigonal lattice with honeycomb cavities, as well as 25% of statistical iron vacancies in the crystal structure. The compound depicts high dielectric constants from 998 to 1850 at a frequency of 1 kHz depending on the sintering temperature, comparable with benchmark dielectric materials. According to the complex electrochemical impedance results, the compound depicts an electrical conductivity at ambient temperature. Optical investigations reveal a band gap of 1.64 eV, which is in agreement with an electronic band gap of 1.63 eV computed by density functional theory calculations. Magnetometry results reveal an antiferromagnetic behavior with a transition at 120 K. These findings introduce Na2[Fe3S4] as a sustainable multifunctional material with potential for a variety of electronic and magnetic applications.