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Structure And Properties Of The Low-Density Phase Ι-Al2o3 From First Principles, Sitaram Aryal, Paul Rulis, Lizhi Ouyang, Wai-Yim Ching
Structure And Properties Of The Low-Density Phase Ι-Al2o3 From First Principles, Sitaram Aryal, Paul Rulis, Lizhi Ouyang, Wai-Yim Ching
Mathematical Sciences Faculty Research
Of the various phases of transition alumina, iota-alumina (ι-Al2O3) is the least well known. It is considered to be the end member of the mullite series in the limit of zero Si content. The structural details of ι-Al2O3 are not available and its physical properties are totally unknown. Based on an appropriately modified structure of a high alumina content mullite phase close to the 9-1 mullite, we have successfully constructed a structural model for ι-Al2O3. The simulated x-ray diffraction (XRD) pattern of this model agrees well with a measured XRD pattern obtained from samples that claim to belong to ι-Al2O3. …