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Investigations of both the fundamental materials science and functional parameters of the perovskite family.
Keywords: Perovskite , Magnetoelectric, x-ray diffraction
The physics of the 113 perovskite underlies many of the functional characteristics in ceramic materials. Considering ferroelectric, magnetic, thermoelectric, and magnetoelectric parameters, we often find ourselves trying to understand the coupled relationship between phonon modes and structure. As the perovskite is in principle simple, we have the opportunity to adequately understand these interwoven characteristics. In this talk I will focus on a particular rare earth tetravalent titinate, EuTiO3. This system is particularly interesting as it straddles the electric & antiferrodistortive (AFD)definitive groupings. In an ambient environment it maintains a vicarious form of both, being antiferroelectric (AFE)with a modulation (superstructure) of the AFD structure. However, under hydrostatic pressure or when grown in film form with zero lattice mismatch induced strain the electric component vanishes and the AFD modulation becomes purely commensurate to the perovskite structure. These two phenomena also drive the potential to control the magnetic order through either electric field or degree of strain. This talk will survey our recent experimental findings and put them into context of the ceramic materials in general.
Philip Ryan, Physicist
Argonne National Laboratory
Argonne, IL

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