“…Metallic Co crystallite diameter was calculated from in-situ XRD measurement results (Table 2) with Scherrer equation (Equation ( 4)). In comparison to H 2 -chemisorption Co 0 particle size, smaller Co 0 particle size values with in-situ XRD measurement was assumed to result from sample characteristics that are not considered with Scherrer equation, such as, defect concentration, crystalline strain, stacking faults, compositional variation, nanocrystallite size distribution, and sample thickness [29].…”