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- 저자 : Osofsky, M.S. (검색결과 1 건)
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Tho, P.T.,Clements, E.M.,Kim, D.H.,Tran, N.,Osofsky, M.S.,Phan, M.H.,Phan, T.L.,Lee, B.W. Elsevier 2018 JOURNAL OF ALLOYS AND COMPOUNDS Vol.741 No.-
<P><B>Abstract</B></P> <P>We have studied the crystal structure and magnetic properties of Bi<SUB>0.84</SUB>La<SUB>0.16</SUB>Fe<SUB>1-x</SUB>Ti<SUB>x</SUB>O<SUB>3</SUB> (<I>x</I> = 0.02–0.1) at the morphotropic phase boundary of <I>R</I>3<I>c</I>, <I>Imma</I>, and <I>Pbam</I> phases. The results of Rietveld-refined X-ray diffraction patterns reveal the existence of multi-phase structures, including <I>R</I>3<I>c</I> + <I>Imma</I> for <I>x</I> = 0.02–0.06 and <I>Imma + Pbam</I> for <I>x</I> = 0.08–0.1. The studies of Raman scattering spectra indicate a structural transformation through the disappearance of typical <I>R</I>3<I>c</I> modes. This strongly influences the magnetic properties that are dependent on the crystalline phase ratio. In particular, the magnetic coercivity of <I>x</I> = 0.04–0.06 drastically changes when the <I>Imma</I> phase is dominant. A mechanism of magnetic interactions occurring at the phase boundary is proposed to explain the features of magnetic hysteresis loops of the compounds.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Crystal structure of (La,Ti)-codoped BiFeO<SUB>3</SUB> at morphotropic phase boundary. </LI> <LI> Magnetic properties are strongly dependent on the phase ratio of two crystal structures. </LI> <LI> Magnetic interactions at the phase boundary were explained. </LI> <LI> The vertical hysteresis shift (exchange bias) is related to the pinned spin at the phase boundary. </LI> </UL> </P>
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