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EN01.08.01 : Processing and Transport Relationships in Vapor Phase Synthesis of Na0.7Ga4.7Zr0.3O8

5:00 PM–7:00 PM Apr 4, 2018

PCC North, 300 Level, Exhibit Hall C-E

Description
Shane Tory1 Leila Ghadbeigi1 Anil Virkar1 Taylor Sparks1

1, University of Utah, Salt Lake City, Utah, United States

Sodium based electrochemical cells are gaining interest in industry due to the high availability and abundance of sodium. A sodium ion conducting electrolyte is required for the cell to function. Sodium zirconium gallate (Na0.7Ga4.7Zr0.3O8) belongs to the beta gallate rutile structure and was recently discovered. Preliminary measurements show it to be a one-dimensional sodium ion conductor. Synthesis of Na-β″-alumina + 3 mol.%Y2O3-stabilized zirconia (YSZ) by a vapor phase process led to a slightly textured microstructure with accompanying anisotropic transport. Here we report on the synthesis of Na0.7Ga4.7Zr0.3O8 + YSZ composites by a vapor phase process and observe no evidence of crystallographic texturing either in microstructure or powder diffraction. Furthermore, ionic transport is isotropic. The kinetics of vapor phase transformation in Na0.7Ga4.7Zr0.3O8 + YSZ composites are reported. The results show a similar behavior to what was observed previously for Na-β″-alumina + YSZ composites.

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