The conductivity of Li7VN4 specimens and its dependence upon the press
ure of quasi-hydrostatic treatment are measured up to 10 kbar. Baric e
mfs of cells with the Li7NV4 solid electrolyte are measured. The data
obtained are used to calculate the partial molar volume of the Li3N qu
asi-molecule in the Li7NV4 compound and the activation volume of the F
renkel pair formation in this electrolyte. A physical interpretation i
s given.