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Synthesis, electronic structure and physical properties of two new layered compounds, EuFAgSe and EuFAg1−δTe, featuring the active redox pair Eu2+/Ag+

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Abstract

Systematic studies of the ZrCuSiAs (also LaOAgS or 1111) structure type resulted in the synthesis of two new fluoride chalcogenides, EuFAgSe and EuFAg1−δTe, whereas their sulfide analog, EuFAgS, could not be obtained. Both new compounds are tetragonal, P4/nmm, with cell parameters a = 4.1542(1) Å, c = 9.2182(1) Å for the selenide and a = 4.3255(1) Å, c = 9.5486(1) Å for the telluride. Rietveld refinement reveals a significant silver deficiency in the telluride (δ = 0.05), while the selenide is nearly stoichiometric. Both compounds are semiconductors as shown by diffuse reflectance spectroscopy and confirmed by density-functional calculations of the band structure. Magnetism of both compounds is predominantly driven by Eu2+, as indicated by magnetic susceptibility measurements and corroborated by 151Eu Mössbauer spectroscopy. EuFAg1−δTe and EuFAgSe are paramagnetic down to 1.8 K.

Graphical abstract: Synthesis, electronic structure and physical properties of two new layered compounds, EuFAgSe and EuFAg1−δTe, featuring the active redox pair Eu2+/Ag+

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Article information


Submitted
24 Apr 2020
Accepted
11 May 2020
First published
12 May 2020

Dalton Trans., 2020, Advance Article
Article type
Paper

Synthesis, electronic structure and physical properties of two new layered compounds, EuFAgSe and EuFAg1−δTe, featuring the active redox pair Eu2+/Ag+

I. V. Plokhikh, A. A. Tsirlin, L. Heletta, S. Klenner, D. O. Charkin, A. N. Kuznetsov, A. V. Shevelkov, R. Pöttgen and A. Pfitzner, Dalton Trans., 2020, Advance Article , DOI: 10.1039/D0DT01504K

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