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${\beta}$- Eucryptite (LiAlSiO4) is a potential electrolyte for Li- ionbattery due to its high Li- ion conductivity and very small volume thermalexpansion coefficient. We have performed ab-initio molecular dynamicssimulations of $\beta$- Eucryptite to study the origin of high temperaturesuperionic phase transition in this material. The simulations are able toprovide the microscopic understanding of the one -dimensional superionicitythat occurs along the hexagonal c-axis and is associated with theorder-disorder nature of the phase transition. The Li ionic conductivity isfound to enhance due to the anisotropic negative thermal expansion alonghexagonal c-axis. The introduction of defects in the crystal like, excess Li ininterstitial sites, Li vacancy and O vacancy are found to significantlyincrease the ionic conductivity and hence might reduce the temperature of thesuperionic phase transition in this material.

Ab-initio Molecular Dynamics study of 1-D Superionic Conduction and Phase Transition in \b{beta}- Eucryptite