Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7705555 | International Journal of Hydrogen Energy | 2018 | 13 Pages |
Abstract
440Bright-field high-resolution electron microscopy micrographs of the powders of LaPO4·nH2O (a) and La1âxSrxPO4âx/2 (x = 0.05) prepared by a dry mechanically activated chemical reaction both calcined at 800 °C/12 h. Crystals with boundaries much cleaner of an amorphous phase were observed by HREM for undoped samples (a) meanwhile for those doped (b) an amorphous phase is observed at some of the boundaries of the grains. The fringe spacing of the (200) plane is 0.564 (2) nm which corresponds to that reported for the base-centered orthorhombic La(PO3)3 structure. The inset at the top of Fig. (b) corresponds to the SAED pattern at the boundaries of the crystals and reveals an amorphous pattern.
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Authors
MarÃa T. Colomer,