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Solid electrolytes with compositions of (100 – x )(0.75Li 2 S·0.25P 2 S 5 )· x LiBH 4 (mol %, 0 ≤ x ≤ 100) were mechanochemically prepared from the 75Li 2 S·25P 2 S 5 (mol %) glass and LiBH 4 crystal. The samples with x ≥ 43 have crystalline phases and those with x ≤ 33 formed a glassy phase. The crystalline phase was identified as argyrodite Li 6 PS 5 (BH 4 ). The x = 50 sample formed a crystalline phase and demonstrated a high lithium-ion conductivity of 1.8 × 10 –3 S cm –1 at 25 °C with an activation energy of 16 kJ·mol –1 . The argyrodite-type crystal with a BH 4 – anion that occupies the halide site is a novel and promising solid electrolyte.

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A study of the effect of an overload on fatigue crack propagation behavior has been carried out at baseline R-values of 0, -1, and -1.5. The usual delayed retardation event was observed at R = 0. At R = -1 the degree of retardation was reduced. At R = -1.5 the fatigue crack growth rate was observed to accelerate after the overload. These behaviors were related to the extent of crack closure, which existed following the overload. The rate of fatigue crack propagation for all loading conditions was correlated with the parameter AK e tt -AKeaii, where AK e ffth is the effective value of the stress intensity factor range at threshold.

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