The structural, electrical and magnetoelectric properties of soft-chemically-synthesized SmFeO<sub>3</sub>ceramics

Sahoo, Sushrisangita; Mahapatra, P. K.; Choudhary, R. N. P.

doi:10.1088/0022-3727/49/3/035302

Cited by 96 publications

(18 citation statements)

References 49 publications

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“…An identical circuit of a series combination of parallel resistances (R) and capacitances (C) is operated for individual arc. A disappearance of an ideal Debye type of relaxation can be interpreted by the CPE (constant phase element) which can be connected to the parallel RC system in the proposed circuit [37]. An observed relaxation phenomenon is the non-Debye type due to the imperfections and inhomogeneity of the Nd 2 NiMnO 6 sample.…”

Section: Nyquist Plotsmentioning

confidence: 98%

Structure, dielectric and electrical properties of relaxor lead-free double perovskite: Nd2NiMnO6

Das

Choudhary

2019

PAC

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In this paper, dielectric relaxor, impedance, AC conductivity and electrical modulus of double perovskite Nd 2 NiMnO 6 , prepared by a solid state reaction method and sintered at 1250°C, have been reported in the wide temperature (25-150°C) and frequency (1 kHz-1 MHz) ranges. From the preliminary X-ray structural analysis, it is found that the structure of the material is monoclinic. In the study of the temperature dependence of the dielectric constant, the relaxor behaviour of the material is observed. Such type of behaviour is explained by a modified Curie-Weiss and a Vogel-Fulcher law. By analysing Nyquist plots, the existence of grain and grain boundary effects is established. The non-Debye type of relaxation is investigated by the analysis of complex impedance and the modulus data. From the study of impedance data, it is found that the grain resistance is reduced with the increase in temperature indicating the existence of negative temperature coefficient of resistance (NTCR) behaviour in the material which also matches with temperature versus AC conductivity plots. From these results, it may be concluded that this compound may have extreme potential for different high temperature applications.

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Section: Nyquist Plotsmentioning

confidence: 98%

Structure, dielectric and electrical properties of relaxor lead-free double perovskite: Nd2NiMnO6

Das

Choudhary

2019

PAC

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“…6(b)) should also manifest in SFO-1 (~55 nm grains), but over the microwave range (> 1 MHz, not probed here); a hint of the corresponding power-law regime is marginally observable at the high-frequency-end of the conductivity-isotherms, recently reported in a 50-60 nm SFO sample. 49 This circumstance is due to the inverse relation between the characteristic frequency-and length-scales. 50,51 In turn, this also explains the detection (absence) of (dε′/dT)-discontinuity at T SR in SFO-1 (SFO-2) over the RF-range (supplementary Fig.…”

Section: Dielectric Measurementsmentioning

confidence: 99%

Nanosize effect: Enhanced compensation temperature and existence of magnetodielectric coupling in SmFeO3

et al. 2017

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In transition metal oxides, quantum confinement arising from a large surface to volume ratio often gives rise to novel physico-chemical properties at nanoscale. Their size dependent properties have potential applications in diverse areas, including therapeutics, imaging, electronic devices, communication systems, sensors, and catalysis. We have analyzed structural, magnetic, dielectric, and thermal properties of weakly ferromagnetic SmFeO 3 nanoparticles of sizes about 55 nm and 500 nm.The nano-size particles exhibit several distinct features that are neither observed in their larger-size variants nor reported previously for the single crystals. In particular, for the 55 nm particle, we observe six-fold enhancement of compensation temperature, an unusual rise in susceptibility in the temperature range 550 to 630 K due to spin pinning, and coupled antiferromagnetic-ferroelectric transition, directly observed in the dielectric constant. I.

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“…They are challenging and exciting materials because of their multifunctional applications, such as sensors, transducers, memories, and spintronics. For practical applications of multiferroics, it is a great challenge to achieve the existence of magneto-electric (ME) coupling [1] in the materials. They exhibit different properties, such as insulating, metallic, ferromagnetic, ferroelectric, magneto-dielectric, multiferroic, etc.…”

Section: Introductionmentioning

confidence: 99%

Dielectric relaxation and magneto-electric characteristics of lead-free double perovskite: Sm2NiMnO6

Das

Choudhary

2019

J Adv Ceram

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The polycrystalline sample of a double perovskite, Sm 2 NiMnO 6 was synthesized by a solid-state reaction route. From the X-ray structural study, it is found that the structure of the material is monoclinic with lattice parameters: a = 4.1750(63) Å, b = 7.6113(63) Å, c = 5.9896(63) Å, and β = 112.70°. These parameters are very close to and consistent with those of such type of materials. The dielectric, impedance, AC conductivity, and electrical modulus properties of the sample were studied in the temperature range of 25-300 ℃ and the frequency range of 1 kHz-1 MHz. Typical relaxor behavior observed in the dielectric studies was confirmed by Vogel-Fulcher fitting. From the Nyquist plots, the temperature dependent contribution of grain and grain boundary effect was confirmed. The non-Debye type of relaxation was found using the complex impedance spectroscopy. The magnetic study revealed that the sample had paramagnetic behavior at room temperature. Magneto-electric (ME) coefficient was obtained by changing DC bias magnetic field. This type of lead-free relaxor ferroelectric compound may be useful for high-temperature applications.

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The structural, electrical and magnetoelectric properties of soft-chemically-synthesized SmFeO₃ceramics

Cited by 96 publications

References 49 publications

Structure, dielectric and electrical properties of relaxor lead-free double perovskite: Nd2NiMnO6

Structure, dielectric and electrical properties of relaxor lead-free double perovskite: Nd2NiMnO6

Nanosize effect: Enhanced compensation temperature and existence of magnetodielectric coupling in SmFeO3

Dielectric relaxation and magneto-electric characteristics of lead-free double perovskite: Sm2NiMnO6

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The structural, electrical and magnetoelectric properties of soft-chemically-synthesized SmFeO3ceramics

Cited by 96 publications

References 49 publications

Structure, dielectric and electrical properties of relaxor lead-free double perovskite: Nd2NiMnO6

Structure, dielectric and electrical properties of relaxor lead-free double perovskite: Nd2NiMnO6

Nanosize effect: Enhanced compensation temperature and existence of magnetodielectric coupling in SmFeO3

Dielectric relaxation and magneto-electric characteristics of lead-free double perovskite: Sm2NiMnO6

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The structural, electrical and magnetoelectric properties of soft-chemically-synthesized SmFeO₃ceramics