Semiconducting mixed valence sulfido (selenido) ferrates : : optical, dielectric, and electrochemical impedance properties

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Abstract: The ternary potassium sulfido and selenido ferrates K9[Fe2S(e)7] were synthesized as pure phases through a facile and straightforward solid-state method. The compounds crystalize isotypic as has been reported previously. UV-visible measurements indicate semiconductivity, showing direct optical band gaps with energies of 1.91 eV for the sulfido and 1.72 eV for the selenido ferrate. Investigations of dielectric and impedance properties provide their dielectric constants in the range of 60 to 74 at room temperature at a frequency of 1 kHz, as well as ionic conductivity values in the range of 2.08 ⋅ 10−5 and 2.61 ⋅ 10−5 mS cm−1. Both, the dielectric constants and the calculated ionic conductivity of the selenido ferrate are higher compared to the sulfido ferrate, corresponding to the larger unit cell volume and increased bond lengths in the selenido ferrates. The dielectric constants are comparably higher than the reference material of SiO2, which might introduce them for dielectric applications

Location: Deutsche Nationalbibliothek Frankfurt am Main

Extent: Online-Ressource

Language: Englisch

Notes: European Journal of Inorganic Chemistry. - 27, 36 (2024) , e202400522, ISSN: 1099-0682

Event: Veröffentlichung

(where): Freiburg

(who): Universität

(when): 2025

Creator: Reza Ghazanfari, Mohammad
Janus, Lara
Ramadan, Islam
Tallu, Mirko
Dehnen, Stefanie
Thiele, Günther

DOI: 10.1002/ejic.202400522

URN: urn:nbn:de:bsz:25-freidok-2623604

Rights: Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.

Last update: 15.08.2025, 7:36 AM CEST

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Associated

Reza Ghazanfari, Mohammad
Janus, Lara
Ramadan, Islam
Tallu, Mirko
Dehnen, Stefanie
Thiele, Günther
Universität

Time of origin

2025

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