Using a mechanochemical technique in the composition range 0 <= x (mol.%) <= 30 and subsequent heat treatment, (100 - x)(0.6MgS center dot 0.4P(2)S(5))center dot xMgI(2) glasses and glass-ceramics were prepared from 60MgS center dot 40P(2)S(5) (mol.%) glass and MgI2 crystal. The effects of the addition of MgI2 on the structures and properties of the glass and glass-ceramic electrolytes were examined. The Raman spectra of all the glass-ceramics showed that the glass-ceramics included P2S64- ions. The glass-ceramic having composition of x = 20 showed electrical conductivity of 2.1 x 10(-7) S cm(-1) at 200 degrees C. (C) 2013 Elsevier B.V. All rights reserved.