“…10 Furthermore, the peaks at 2 θ of 15.66°, 27.97°, 39.47° and 48.64° for pure La(OH) 3 correspond to the (100), (101), (201) and (211) crystal planes of La(OH) 3 (JCPDS # 83-2034). 33 Note that the intensities of La(OH) 3 characteristic peaks in BOL- x composites increase along with increased addition of La 3+ during synthesis, from sample BOL-1 to BOL-4. Obvious diffraction peaks referred to La(OH) 3 can be observed in the XRD pattern of BOL-4, whereas the La(OH) 3 peaks in the XRD patterns of BOL-1 and BOL-2 are relatively weak, probably due to the smaller amount of La(OH) 3 formed.…”