Magnetically active transition metal cation-substituted alumina

Changning Li, Nicholas Ku, Yaohua Liu, Jinbo Pan, Binbo Chai, Feng Hu, Michael Kornecki, Qimin Yan, Raymond Brennan, Shenqiang Ren

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Alumina (Al2O3) is one of the most widely used ceramic materials for innumerable applications, due to its unique combination of attractive physical and mechanical properties. These intrinsic properties are dictated by the numerous phases that Al2O3 forms and its related phase transformations. Transition metal (TM) cation dopants (iron (Fe), cobalt (Co), nickel (Ni) and manganese (Mn)), even in sparse amounts, have been shown to significantly affect the phase transformation and microstructural evolution of Al2O3. Small concentrations of TM cation dopants have successfully been incorporated to synthesize magnetically active Al2O3, while reducing the θ to α phase transformation temperature by 150 °C, and maintaining the outstanding mechanical properties. In addition, first-principle calculations based on density-functional theory with hybrid functional (HSE06) and the PBE+U methods have provided a mechanistic understanding of the formation energy and magnetism of the TM-doped α and θ phases of Al2O3. The results reveal a potential route for phase transition regulation and external magnetic field-induced texturing of Al2O3 ceramics.

Original languageEnglish
Pages (from-to)105703
Number of pages1
JournalNanotechnology
Volume31
Issue number10
DOIs
StatePublished - Mar 6 2020

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