The 55 µ𝑚 peak attributed to agglomerates of as-received powder which only consist of less than 2% of the total volume percentage. After the milling, the agglomeration peak completely disappeared and the mean particle size decreased by ~50%. However, a slightly more broaden peak, but with skewness closer to unity and with higher uniformity was achieved. The PSD of the ball-milled 6𝑆𝑐1𝐶𝑒𝑍𝑟 shows two peaks with maxima at 300 𝑛𝑚 and the second maxima at 3 µ𝑚 with an overall particle range of 100 𝑛𝑚 to 10 µ𝑚. The inter quartile coefficient of skewness (IQCS) as a measure of degree of asymmetry of the particle size distribution was calculated from the equation below ]