THE STUDY OF BAROELECTRIC PHENOMENA IN THE LI7NBN4 SOLID-ELECTROLYTE

Baro-emf values of the (+) N-2, Ni\Li7NbN4\Li7NbN4\Ni, N-2 (-) electr ochemical cells are measured at pressures of up to 1.25 x 10(9) Pa. He re, Li-7\NbN4 and Li7NbN4 are the samples of identical composition wh ich are in equilibrium and treated with hydrostatic pressure, respecti vely. The maximum values of emf thus obtained are employed to calculat e molar volumes of Li3N in Li7NbN4; the latter exceeded the same quant ities evaluated from the crystallographic data. The electroconductivit y of the samples is measured as a function of the treatment temperatur e and pressure. These data are utilized to calculate the activation vo lume and the formation energy of a Frenkel pair in the lithium sublatt ice of Li7NbN4.