If a Schottky defect concentration of 6.2 x 1010 /cm3 is observed in Al2O3, what is the total vacancy concentration (in 1/cm3) present in this sample of Al2O3? a. 2.3 x 108 b. 3.1 x 1010 c. 6.2 x 1010 d. 1.24 x 1011 e. 3.1 x 1011

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