Conductivity, dielectric behaviour and magnetoelectric effect in copper ferrite-barium titanate composites

Mahajan, R P; Patankar, K. K.; Kothale, M. B.; Patil, S. A.

doi:10.1007/bf02720082

Cited by 135 publications

(47 citation statements)

References 13 publications

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“…In the past two decades, various particulate composites consisting of piezoelectric and magnetostrictive materials with different connectivity schemes including "3-0" and "2-0" have been reported: such as CoFe 2 [26][27][28][29][30][31][32]. Table 2 provides a brief list of results obtained on these composite materials.…”

Section: Sinteringmentioning

confidence: 96%

“…Table 2 lists some of the composite materials reported in literature, their magnitude and experimental conditions. [14,[24][25][26][27][28][29][30][31][32][33][34] It can be seen from this table that at low frequencies the magnitude of the ME effect can be as large as 115 mV/ cm·Oe: which is ∼300 times higher than that of Cr 2 O 3 . Tables 3, 4 and 5 provide a list of magnetostrictive and piezoelectric materials of interest.…”

Section: Introductionmentioning

confidence: 94%

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Recent advancements in magnetoelectric particulate and laminate composites

et al. 2007

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Recently, the magnetoelectric (ME) effectdielectric polarization of a material under magnetic field, or induced magnetization under an electric field-has become the focus of significant research interests. The primary requirement for the observance of said effect is the coexistence of magnetic and electric dipoles. Most of the known single phase materials suffer from the drawback that the ME effect is quite small, even at low temperatures limiting their applicability in practical devices. Better alternatives are ME composites, which have large magnitudes of the ME voltage coefficient. Composites exploit the product property of materials; where the ME effect is realized by combining magnetostrictive and piezoelectric phases that independently are not ME, but acting together (i.e., their product) result in a ME effect. In this review article, we survey recently reported results concerning ME composites, focusing on ME particulate (synthesized via a controlled precipitation technique) and laminated composites. The article also provides a survey of the compositions and magnitudes of the ME coefficients reported in the literature; a brief description of the analytical models developed to explain and predict the behavior of composites; and discuss several applications that are made possible by enhanced ME effects.

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Section: Sinteringmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 94%

Recent advancements in magnetoelectric particulate and laminate composites

et al. 2007

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“…Since most of researches on ferrites highlight on the development of advanced ferrite materials which satisfy specific requirements in different industrial applications, many attempts have been done to synthesize and investigate pure and substituted copper ferrite [1][2][3][4][5][6][7]. It was found that such kinds of ferrites are characterized by a spinel structure with high thermodynamic stability, electrical conductivity and high catalytic activity.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Oxidation of CO Gas over Nanocrystallite Cu x Mn1−x Fe2O4

et al. 2008

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The catalytic oxidation of CO over nanocrystallite Cu x Mn (1-x) Fe 2 O 4 powders was studied using advanced quadruple mass gas analyzer system. The oxidation of CO to CO 2 was investigated as a function of reactants ratio and firing temperature of ferrite powders. The maximum CO conversion was observed for ferrite powders which have equal amount of Cu 2+ and Mn 2+ (Cu 0.5 Mn 0.5 Fe 2 O 4 ). The high catalytic activity of Cu 0.5 Mn 0.5 Fe 2 O 4 can be attributed to the changes of the valence state of catalytically active components of the ferrite powders. The firing temperature plays insignificant role in the catalytic activity of CO over nanocrystallite copper manganese ferrites. The mechanism of catalytic oxidation reactions was studied. It was found that the CO catalytic oxidation reactions on the surface of the Cu x Mn 1-x Fe 2 O 4 was done by the reduction of the ferrite by CO to the oxygen deficient lower oxide then re-oxidation of this phase to the saturated oxygen metal ferrite again.

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“…Though some materials with coupling between electrical and magnetic ordering (i.e., a change in an external electric field induces magnetic properties, or vice versa) are rare, they are very promising from points of view of their science and technological applications [3][4][5][6][7]. Lead iron niobate Pb(Fe 1/2 Nb 1/2 )O 3 (PFN) is one of these materials whose high dielectric constant, ferroelectric and antiferromagnetic properties have been reported long ago [8,9].…”

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confidence: 99%

Structural and electrical properties of V‐modified Pb(Fe_0.5Nb_0.5)O₃ ceramics

Sahoo

Choudhary

Mathur

2009

Physica Status Solidi (b)

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Polycrystalline samples of Pb(Fe0.5Nb0.5–x Vx)O3, x = 0, 0.05, 0.10, 0.15 were synthesized by a mixed oxide technique. Preliminary structural analysis suggests that the compounds have been formed in single‐phase monoclinic crystal system. Incorporation of V+5 in place of Nb+5 significantly reduces the sintering temperature of the compounds. Scanning electron micrographs of the compounds show that the grains are uniformly and densely distributed over the entire surface of the samples. Detailed studies of dielectric properties (dielectric constant and tangent loss) as a function of frequency (103–106 Hz) and temperature (50–300) °C suggest that Pb(Fe0.5Nb0.5–x Vx)O3 x = 0.0, 0.05 undergoes a ferroelectric–paraelectric phase transition. The phase transition in these compositions has been confirmed with the polarisation measurement. For the composition x = 0.10 and 0.15 ferroelectric phase transition vanishes due the grain size reduction. The presence of loss anomaly at high temperature in all V‐doped Pb(Fe0.5Nb0.5)O3 is related to the charge hopping relaxation. On increase in vanadium content in PFN the grain size reduces below the critical value for ferroelectricity to vanish. The ac conductivity of the compounds was found to increase on increasing temperature suggesting NTCR behavior of the materials. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Conductivity, dielectric behaviour and magnetoelectric effect in copper ferrite-barium titanate composites

Cited by 135 publications

References 13 publications

Recent advancements in magnetoelectric particulate and laminate composites

Recent advancements in magnetoelectric particulate and laminate composites

Catalytic Oxidation of CO Gas over Nanocrystallite Cu x Mn1−x Fe2O4

Structural and electrical properties of V‐modified Pb(Fe_0.5Nb_0.5)O₃ ceramics

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Conductivity, dielectric behaviour and magnetoelectric effect in copper ferrite-barium titanate composites

Cited by 135 publications

References 13 publications

Recent advancements in magnetoelectric particulate and laminate composites

Recent advancements in magnetoelectric particulate and laminate composites

Catalytic Oxidation of CO Gas over Nanocrystallite Cu x Mn1−x Fe2O4

Structural and electrical properties of V‐modified Pb(Fe0.5Nb0.5)O3 ceramics

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Product

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Structural and electrical properties of V‐modified Pb(Fe_0.5Nb_0.5)O₃ ceramics