Solid electrolyte material and battery

A solid electrolyte material represented by the following Compositional Formula (1):

• Li6-3zYzX6
• where 0<z<2 is satisfied;
• and
• X represents Cl;
• wherein
• the solid electrolyte material includes at least one fifth crystal phase;
• and
• the fifth crystal phase shows, in structural analysis of the fifth crystal phase through X-ray diffractometry by a θ-2θ method using Cu-Kα rays having wavelengths of 1.5405 angstrom and 1.5444 angstrom as the X-ray, peaks within ranges of diffraction angle 2θ values of 15.3° to 16.3°, 29.8° to 32°, 38.5° to 41.7°, 46.3° to 50.4°, and 50.8° to 55.4°;
• and wherein:
• FWHM5 denoting a full width at half maximum of the X-ray diffraction peak observed within the range of 29.8° to 320 in the X-ray diffractometry using Cu-Kα rays, and
• 2θc5 denoting a diffraction angle at the center of the X-ray diffraction peak satisfy:
• FWHM5/2θc5≥0.015.