Electron microscopy characterization of hot-pressed Al substituted Li7La3Zr2O12
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Hot-pressing was used to prepare a dense (97% relative density) cubic Al substituted Li7La3Zr2O12 material at temperatures lower than typically used for solid-state and/or liquid phase sintering. Electron microscopy analysis revealed equiaxed grains, grain boundaries, and triple junctions free of amorphous and second phases and no Al segregation at grain boundaries. These results suggest that Al2O3 and/or Al cannot act as a sintering aid by reducing grain boundary mobility. If Al2O3 acts as a sintering aid its main function is to enter the lattice as Al to increase the point defect concentration of the slowest moving species.
KeywordsBoron Nitride Inductively Couple Plasma Triple Junction Scan Transmission Electron Microscope Liquid Phase Sinter
JW and JAL would like to acknowledge support of the U. S. Army Research Laboratory (ARL). JS authors would like to acknowledge the support of the U.S. Army Research Office (ARO). The authors would like to acknowledge support of the Maryland NanoCenter and its Nanoscale Imaging Spectroscopy and Properties Laboratory. The Nanoscale Imaging Spectroscopy and Properties Laboratory are supported in part by the NSF as a MRSEC Shared Experimental Facility. In particular, the help of Dr. W. A. Chiou and Dr. L.-C. Lai of Nanoscale Imaging Spectroscopy and Properties Laboratory are greatly appreciated.
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