Directed Dehydration as Synthetic Tool for Generation of a New Na4SnS4 Polymorph: Crystal Structure, Na+ Conductivity, and Influence of Sb-Substitution

Hartmann F, Benkada A, Indris S, Poschmann M, Luehmann H, Duchstein P, Zahn D, Bensch W (2022)

Publication Type: Journal article

Publication year: 2022

Journal

Angewandte Chemie International Edition Wiley

DOI: 10.1002/anie.202202182

Abstract

We present the convenient synthesis and characterization of the new ternary thiostannate Na4SnS4 (space group (Formula presented.)) by directed removal of crystal water molecules from Na4SnS4⋅14 H2O. The compound represents a new kinetically stable polymorph of Na4SnS4, which is transformed into the known, thermodynamically stable form (space group (Formula presented.)) at elevated temperatures. Thermal co-decomposition of mixtures with Na3SbS4⋅9 H2O generates solid solution products Na4−xSn1−xSbxS4 (x=0.01, 0.10) isostructural to the new polymorph (x=0). Incorporation of Sb5+ affects the bonding and local structural situation noticeably evidenced by X-ray diffraction, 119Sn and 23Na NMR, and 119Sn Mössbauer spectroscopy. Electrochemical impedance spectroscopy demonstrates an enormous improvement of the ionic conductivity with increasing Sb content for the solid solution (σ25°C=2×10−3, 2×10−2, and 0.1 mS cm−1 for x=0, 0.01, and 0.10), being several orders of magnitude higher than for the known Na4SnS4 polymorph.

Authors with CRIS profile

Patrick Duchstein Computer-Chemie-Centrum Dirk Zahn Professur für Theoretische Chemie

Involved external institutions

Christian-Albrechts-Universität zu Kiel DE Germany (DE) Karlsruhe Institute of Technology (KIT) DE Germany (DE) Max-Planck-Institut für Chemische Energiekonversion (MPI CEC) / Max-Planck-Institute for Chemical Energy Conversion DE Germany (DE)

How to cite

APA:

Hartmann, F., Benkada, A., Indris, S., Poschmann, M., Luehmann, H., Duchstein, P.,... Bensch, W. (2022). Directed Dehydration as Synthetic Tool for Generation of a New Na4SnS4 Polymorph: Crystal Structure, Na+ Conductivity, and Influence of Sb-Substitution. Angewandte Chemie International Edition. https://doi.org/10.1002/anie.202202182

MLA:

Hartmann, Felix, et al. "Directed Dehydration as Synthetic Tool for Generation of a New Na4SnS4 Polymorph: Crystal Structure, Na+ Conductivity, and Influence of Sb-Substitution." Angewandte Chemie International Edition (2022).

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