 FREMONT, Calif., April 28, 2021 GLOBE NEWSWIRE -- AXT, Inc. NasdaqGS: AXTI, a leading manufacturer of compound semiconductor substrate wafers, today announced that is has developed and shipped its first 8-inch diameter gallium arsenide GaAs substrates to a major customer. The 8-inch GaAs substrates, which are silicon doped, n-type substrates, demonstrate low etch pit densities EPD and low levels of slip lines. 