Magnetic properties of transition-metal-codoped BaTiO3 systems

Lin, Fangting; Shi, Wangzhou

doi:10.1016/j.jallcom.2008.08.037

Cited by 53 publications

(32 citation statements)

References 26 publications

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“…1 Triggered by integrating multiple functionalities in one material, alternation of physical properties through compositional modification has been widely carried out in perovskite BaTiO 3 and coexistence of ferromagnetism (FM) and ferroelectricity at room temperature were reported. [2][3][4] As another polymorph of BaTiO 3 , hexagonal (6H) BaTiO 3 has increasingly attracted the attention recently because of its unusual high-temperature FM caused by magnetic Fe ion doping of B-site Ti, 5,6 especially when the doping concentration is less than 10 mol%. 7,8 Subsequently, the origin of the FM in the dilute magnetic oxide becomes controversial owing to the possible dopant clustering and precipitation of secondary magnetic phase responsible for the possible extrinsic signals.…”

Section: Introductionmentioning

confidence: 99%

Structure, electrical and magnetic property investigations on dense Fe-doped hexagonal BaTiO3

Wei

Sui

et al. 2011

Journal of Applied Physics

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Hexagonal Ba(Ti 1Àx Fe x )O 3Àd (x ¼ 1/6, 1/3) ceramics treated with post annealing are specifically synthesized to explore the origin mechanism of the unusual ferromagnetism in the doped system. X-ray diffraction refinements and transmission electron microscope experiments reveal that their structures are incommensurately modulated owing to simultaneous oxygen vacancies at both O1 and O2 sites. Consequently, coexisting weak ferrielectricity and weak ferromagnetism are presented at room temperature. Analysis on their leakage current plot reveals that their conduction follows trap-filled limit model. In combination with the magnetism studies on 5 mol% Fe-doped crystals [Phys. Rev. B 83, 144407 (2011)], the reduction of ferromagnetism with an increase of conductivity suggests that dynamic exchanges of trapped electrons among the bound magnetic polarons attribute to the intrinsic ferromagnetism.

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Section: Introductionmentioning

confidence: 99%

Structure, electrical and magnetic property investigations on dense Fe-doped hexagonal BaTiO3

Wei

Sui

et al. 2011

Journal of Applied Physics

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“…As mentioned above, both ions Mn 3+ and Mn 4+ coexist in our system and therefore exchange interactions of Mn 3+ -Mn 4+ , Mn 3+ -Mn 3+ and Mn 4+ -Mn 4+ are possible [14]. In the hexagonal structure, the Mn ions can be located at the sites of pentahedral and octahedral [11]. The interactions of Mn ions between these two sites are responsible for the magnetic properties.…”

Section: Resultsmentioning

confidence: 69%

“…5c, it is elucidated that there is some multiplet splitting of Mn (3p) XPS spectra. As known, Mn can remain on the oxidation states ranging from 2 + to 7 + [11]. Hence, it indicates that Mn is in multiple oxidation state, which is likely to contribute the magnetic signature obtained at x=0.1.…”

Section: Resultsmentioning

confidence: 82%

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Effect of equiproprotional substitution of Zn and Mn in BaTiO3 ceramic—An index to multiferroic applications

Das¹,

Rout²,

Pradhan³

et al. 2012

J Adv Ceram

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This paper reports that ferromagnetism (FM) can be induced in ferroelectric barium titanate (BaTiO 3 ) ceramic with selection of appropriate substituents like Zn and Mn. High 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 concentration. However, 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.

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“…For example, there are TM doping into ferroelectric substance, and usage of exchange interactions at the interface between a ferromagnet and the ferroelectric antiferromagnet [13]. It has been reported that the nano-BaTiO 3 system with vacancies showed a multi-ferroic property [14][15][16][17][18], where the ferromagnetism might be induced from vacancies at the nano-grain surface. The room temperature ferromagnetism was also observed for the ferroelectric LiNbO 3 and KNbO 3 [19,20].…”

Section: Introductionmentioning

confidence: 99%

Ferromagnetism in Mechanically Milled KNO<sub>3</sub>

Ota

Ōno

Uehara

et al. 2014

Trans. Mat. Res. Soc. Japan

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KNO 3 nano-particles with the diameter of about 28 nm were prepared by mechanical milling using planetary ball mill from the commercial KNO 3 powder. Rotation speeds of ball mill were 0 to 500 rpm, where the milling time was kept at 15 minutes. Magnetization was measured by SQUID magnetometer. The milled sample at 500 rpm showed same order of saturation magnetization as that of BaTiO 3 with vacancies.

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Magnetic properties of transition-metal-codoped BaTiO3 systems

Cited by 53 publications

References 26 publications

Structure, electrical and magnetic property investigations on dense Fe-doped hexagonal BaTiO3

Structure, electrical and magnetic property investigations on dense Fe-doped hexagonal BaTiO3

Effect of equiproprotional substitution of Zn and Mn in BaTiO3 ceramic—An index to multiferroic applications

Ferromagnetism in Mechanically Milled KNO<sub>3</sub>

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