Synthesis and Characterization of Sr12Al14O33

Presented During:

07/31/2022: 5:30 PM - 7:30 PM
Portland Marriott Downtown Waterfront  

Conference:

2022: 72nd ACA Annual Meeting

Session Type:

Poster 

Presenting Author :

Claudia Rawn  
University of Tennessee, Knoxville

Additional Author(s):

Katherine (Katie) Loughlin  
University of Tennessee, Knoxville
Michael Koehler  
University of Tennessee, Knoxville

Abstract Body:

Ca12Al14O33 has many interesting and potentially exploitable properties that arise from its crystal structure. The compound is known for being a room-temperature inorganic electride, and depending on the processing conditions, it can have near-metallic electrical conductivity. The unit cell is cubic, space group I4 ̅3d (no. 220), with a lattice parameter of ∼12 Å and contains two formula units. The Ca, Al, and majority of the O create a framework of twelve cages per unit cell, within which the remaining two O are occluded. Isostructural compounds with different cation combinations may result in larger cages and enhanced properties. Using wet chemical methods and initially dissolving Al(NO3)3 • 9H2O and SrCl2 • 6H2O in deionized H2O, Sr12Al14O33 has been synthesized, but attempts to eliminate secondary phases have not succeeded. Room temperature and high temperature X-ray diffraction data have been used to track the phase evolution. One consideration based on the synthesis is that Cl-, with a significantly larger ionic radius than O2-, is being occluded; the replacement of the divalent O with monovalent Cl would allow for more cages to be filled. However, the cage occupant is difficult to interrogate due to the low occupancy.

Additional Information - Poster (2022)

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4.1.1 Materials for our future: Structural insights into energy materials and sustainable materials

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