Moreover, There is an obvious difference in the intensity of the (006) and (015) reflection peaks, suggesting that the samples have a range of preferred orientation. The calculated F values of (001) preferred orientation are 0.10, 0.29, 0.11, 0.25 and 0.12 for f = 0, 0.1, 0.3, 0.5 and 0.8 wt.%, respectively, as shown in Table S1. The obtained result indicates that there is more or less (001) preferred orientation for every specimen.