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A crystalline form of lithium phosphorus oxynitride, Li_2.88 PO_3.73N_0.14, has been prepared by solid state reaction between Li₃N and LiPO₃ under a flowing N₂ atmosphere. The structure of the oxynitride was refined by Rietveld analysis of neutron powder diffraction data using the orthorhombic unit cell of γ-Li₃PO₄ with space group Pmnb. High-performance liquid chromatography measurement indicates that most nitrogen substitutes for oxygen to form PO₃N structural units with small concentrations of P-N&ub.dbond;P due to some Li ↔ P disorder in the structure. The ionic conductivity of Li_2.88PO_3.73N_0.14 (σ25°C ~ 10^-13 S · cm-1) is several orders of magnitude higher than that of γ-Li₃PO₄ (σ_25°C ~ 10^-18 S · cm^-1). Copyright 1995, 1999 Academic Press

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