Issue 27, 2024

The cubic structure of Li3As stabilized by substitution – Li8TtAs4 (Tt = Si, Ge) and Li14TtAs6 (Tt = Si, Ge, Sn) and their lithium ion conductivity

Abstract

The new lithium arsenidotetrelates Li8SiAs4, Li8GeAs4, Li14SiAs6, Li14GeAs6 and Li14SnAs6 were synthesized via ball milling and structurally characterized by Rietveld analysis of X-ray powder diffraction data. The aliovalent substitution of lithium in hexagonal Li3As by introducing a tetravalent tetrel cation stabilizes cubic structures for Li8TtAs4 (Tt = Si, Ge) in the space group Pa[3 with combining macron] and for the lithium richer compound Li14TtAs6 (Tt = Si, Ge, Sn) in the higher symmetrical space group Fm[3 with combining macron]m (no. 225). Thermal properties of the arsenidotetrelates were investigated via high temperature powder diffraction and differential thermal analysis revealing a decomposition process of the lithium richer arsenidotetrelate (Li14TtAs6 → Li8TtAs4 + 2Li3As) into the lithium poorer arsenidotetrelates and lithium arsenide at moderate temperatures. Impedance spectroscopy shows moderate to good lithium ion conductivity for the lithium arsenidotetrelates.

Graphical abstract: The cubic structure of Li3As stabilized by substitution – Li8TtAs4 (Tt = Si, Ge) and Li14TtAs6 (Tt = Si, Ge, Sn) and their lithium ion conductivity

Supplementary files

Article information

Article type
Paper
Submitted
04 mrt 2024
Accepted
18 apr 2024
First published
23 apr 2024

Dalton Trans., 2024,53, 11257-11263

The cubic structure of Li3As stabilized by substitution – Li8TtAs4 (Tt = Si, Ge) and Li14TtAs6 (Tt = Si, Ge, Sn) and their lithium ion conductivity

M. Schmid, F. Wegner, C. De Giorgi, F. Pielnhofer and A. Pfitzner, Dalton Trans., 2024, 53, 11257 DOI: 10.1039/D4DT00664J

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