Preparation and Structure of the Ion-Conducting Mixed Molecular Glass Ga2I3.17

Alexander Rosu-Finsen,Alex C. Hannon,Alfred Amon,Christoph G. Salzmann,M. Emre Sener,Ben Slater

doi:10.1021/acs.inorgchem.1c00049

Alexander Rosu-Finsen, Alex C. Hannon + Show 4 more

Open Access

https://doi.org/10.1021/acs.inorgchem.1c00049

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Abstract

Modern functional glasses have been prepared from a wide range of precursors, combining the benefits of their isotropic disordered structures with the innate functional behavior of their atomic or molecular building blocks. The enhanced ionic conductivity of glasses compared to their crystalline counterparts has attracted considerable interest for their use in solid-state batteries. In this study, we have prepared the mixed molecular glass Ga2I3.17 and investigated the correlations between the local structure, thermal properties, and ionic conductivity. The novel glass displays a glass transition at 60 °C, and its molecular make-up consists of GaI4– tetrahedra, Ga2I62– heteroethane ions, and Ga+ cations. Neutron diffraction was employed to characterize the local structure and coordination geometries within the glass. Raman spectroscopy revealed a strongly localized nonmolecular mode in glassy Ga2I3.17, coinciding with the observation of two relaxation mechanisms below Tg in the AC admittance spectra.

Highlights

Glasses belong to the earliest materials utilized and produced by humanity and have been rediscovered as modern materials based on diverse novel glass-forming precursors and the concomitant functional properties.[1]
Differential scanning calorimetry (DSC) data were collected on a PerkinElmer DSC 8000 system at a rate of 10 K min−1
The glassy nature of g-Ga2I3.17 was confirmed by DSC of glassy

Summary

Introduction

Glasses belong to the earliest materials utilized and produced by humanity and have been rediscovered as modern materials based on diverse novel glass-forming precursors and the concomitant functional properties.[1]. Low glasstransition temperatures Tg and strong tendencies for crystallization remain the major challenges in the design of molecular glasses and hinder long-term applications, in particular, at elevated temperatures.[19]

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