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Effect of equiproprotional substitution of Zn and Mn in baTiO_(3)ceramic-An index to multiferroic applications

Journal of Advanced Ceramics 2012年第3期1卷 241-248页

作者： S.k.DAS P.P.ROUT S.k.PRADHAN b.k.roul Institute of Materials Science Planetarium BuildingAcharya ViharBhubaneswar 751013India

This paper reports that ferromagnetism(FM)can be induced in ferroelectric barium titanate(baTiO_(3))ceramic with selection of appropriate substituents like Zn and *** density polycrystalline samples of Zn and Mn substituted baTiO_(3)(ba_(1-x)Zn_(x)Ti_(1-x)Mn_(x)O_(3),x=0,0.02,0.04,0.06,0.08 and 0.1)were prepared using slow step solid state sintering technique to study the effect of equiproprotional substituents on structural,ferroelectric and magnetic properties of baTiO_(3)(bTO).High precision electrical and magnetic measurements were carried out along with XRD,XPS,and SEM to understand and co-relate magnetic and ferroelectric hysteresis loop observed at room temperature with different values of‘x’.It is seen that ferroelectric hysteresis loop(P~E)is deteriorated(became lossy type)with the increase of Zn and Mn ***,at x=0.1,the material showed the signature of room temperature ferromagnetism,which is an index for bTO to became a promising material for multiferroic applications.M~H loops observed in Zn and Mn substituted bTO are expected to be due to the formation of oxygen vacancies and exchange interaction induced magnetism.

关键词： ceramic magnetism hexagonal polarization

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Magnetic and ferroelectric properties of Zn and Mn co-doped baTiO_3

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Chinese Physics b 2015年第6期24卷 564-570页

作者： Sangram keshari Das binod kumar roul Institute of Materials Science

This paper reports an approach to obtaining multiferroic properties in co-doped （Zn：Mn） baTiO3 near room temper- ature. Interestingly, an unusual magnetic hysteresis loop is observed in the co-doped compositions in which the central portion of the loop is squeezed. However, in the composition ***3, a broad magnetic hysteresis loop is observed. Such a magnetic effect is attributed to the coexistence of antiferromagnetic and ferromagnetic exchange in- teractions in the system. The observation of the above type of magnetic properties is likely to be due to the presence of exchange interactions between Mn ions. A lossy-type of ferroelectric hysteresis loop is also observed in co-doped ceramic compositions near room temperature.

关键词： ferroelectrics ceramic ferromagnetic

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