Effect of neodymium doping on structural, electrical and magnetic properties of multiferroic GdMn2O5

Singh, Devender; Gupta, Vandana; Singh, Ranjan K.; Bamzai, K. K.

doi:10.1007/s10854-017-6559-5

Cited by 3 publications

(5 citation statements)

References 38 publications

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“…At low frequencies, the interfacial polarization will dominate as a result in higher values of effective e¢ and tanδ. At high frequencies the values decreases slowly and then become approximately constant because dipoles are unable to follow the applied field [27].…”

Section: Dielectric Spectroscopymentioning

confidence: 99%

Optical and dielectric spectroscopic analysis of SmMn₂O₅

Ahmad¹,

Bukhari²,

Khan³

et al. 2020

Phys. Scr.

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Polycrystalline SmMn2O5 has been synthesized by using sol-gel auto combustion tecnique. X-ray diffraction (XRD) pattern reflects the single phase formation of orthorhombic structure with Pbam space group. In the frequency range of (30–1000 cm−1) reflectivity spectrum reveals the 14 infrared active phonons out of 36, which are already pridicted theoretically. We have estimated the optical energy band gap (E g ) ≃ 1.5 eV from UV–visible absorption spectrum. Temperature dependent (293-533 K) DC electrical characterization up to 40 V suggests semiconducting nature of the material. The temperature dependent impedance spectroscopy within a broader frequency range of (20 Hz—3 GHz) shows decreasing behavior of dielectric constant and tangent loss while AC conductivity increasing with the rise in frequency and temperature suggest the strong frequency dispersion and relaxational behavior of the material. The activation energy calculation from AC conductivity is in good agreement with semiconducting material energy band gap.

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Section: Dielectric Spectroscopymentioning

confidence: 99%

Optical and dielectric spectroscopic analysis of SmMn₂O₅

Ahmad¹,

Bukhari²,

Khan³

et al. 2020

Phys. Scr.

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“…24 The remaining 13 modes are attributed to the complex motion of the Mn-O vibration. 13 In addition to this, the phonon dynamics are volume dependent. With the increase of Ho concentration, the modes shift towards the lower frequency region.…”

Section: Resultsmentioning

confidence: 99%

“…Because of this the permittivity values are higher at low frequencies and decrease with increasing frequency due to dipolar and interfacial polarization mechanisms. 13,39 Moreover the maximum dielectric constant has been observed at low frequency might be due to the bulk consequence of the samples. 40,41 This dispersion with frequency can be explained by Maxwell-Wagner type interfacial polarization which is based on Koop's theory.…”

Section: Dielectricmentioning

confidence: 98%

“…They also reported that the rare Earth movement is responsible for low frequency phonons shifts whereas O-ions contribute at higher frequency modes and these observations indicate the stretching motion of MnO 6 octahedra caused by changes in cell volume. Deepa Singh et al 13 studied Nd 0.1 Gd 0.9 Mn 2 O 5 , and found that the dielectric peak shifted towards the higher temperature side with increasing frequency. They explained this phenomenon by frequency dispersion and hypothesising the material relaxation behaviour.…”

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confidence: 99%

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Synthesis and Room Temperature Structural, Optical, Electrical Properties of Holmium Doped GdMn₂O₅ Multiferroics

N¹,

Dasari²,

Kishore

et al. 2023

ECS J. Solid State Sci. Technol.

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Multiferroic materials with the compositional formulae Gd1-xHoxMn2O5 (x = 0, 0.1, 0.2, 0.3, and 0.4) were prepared by the conventional solid-state reaction method. The structural analysis has been carried out by X-ray diffraction technique which confirms the orthorhombic structure with the Pbam space group. The optical properties have been studied by UV Visible, FTIR, and Raman spectra. The energy gap that was calculated using UV visible absorption spectra shows that the material is semiconducting in nature. The observed 14 Raman and 17 IR active modes are attributed to the relative motions of corresponding atoms. ; also by increasing the doping concentration of Ho, the emergence of phonon shifting was observed which suggests the possible multiferroic coupling behaviour. The electrical properties including dielectric constant, dielectric loss, and ac conductivity at room temperature indicate the spin-lattice coupling.

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“…Figure 8(b) shows log T dependent dielectric constant (300-473 K) performance which resulted in an increase in temperature and a decrease in frequency as the dielectric constant increased. The dielectric constant at lower frequencies and higher temperatures is high due to polarization [47].…”

Section: Dielectric Propertiesmentioning

confidence: 99%

Structural and spectroscopic analysis of HoMn₂O₅ multiferroics

Ahmad

Afzal²,

Nissar³

et al. 2022

Phys. Scr.

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HoMn2O5was synthesized by sol-gel auto combustion method and analyzed through x-ray diffraction, Fourier transform infrared reflectivity, Raman, UV-visible, Photoluminescence spectroscopies at room temperature and transport properties (applying dc- and ac- electric field) at high temperatures. Structural characterizations revealed single-phase nature and the analysis confirms the crystal structure by Rietveld refinement with orthorhombic symmetry (space group Pbnm). Both Scherer formula and Williamson-Hall analysis have been used to estimate the average grain size; the results come in good agreement. The reflectivity spectrum was fitted by the Lorentz oscillator model to account for the infrared active optical phonons. The Raman spectrum was measured in unpolarized geometry using a 514 nm laser excitation source, which confirmed its orthorhombic crystal structure. UV-visible spectroscopy demonstrated the electronic structure and semiconducting behavior of sample with an estimated bandgap of 1.54 eV. PL spectrum suggested its electronic transition and vibrations of Mn-O bonds. The conduction mechanism was investigated by measuring electrical resistivity in temperature range (293-473K) by two probe method. Dielectric properties have been discussed in terms of variation in dielectric constant, tangent loss, and conductivity as a function of temperature and frequency.

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Effect of neodymium doping on structural, electrical and magnetic properties of multiferroic GdMn2O5

Cited by 3 publications

References 38 publications

Optical and dielectric spectroscopic analysis of SmMn₂O₅

Optical and dielectric spectroscopic analysis of SmMn₂O₅

Synthesis and Room Temperature Structural, Optical, Electrical Properties of Holmium Doped GdMn₂O₅ Multiferroics

Structural and spectroscopic analysis of HoMn₂O₅ multiferroics

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Effect of neodymium doping on structural, electrical and magnetic properties of multiferroic GdMn2O5

Cited by 3 publications

References 38 publications

Optical and dielectric spectroscopic analysis of SmMn2O5

Optical and dielectric spectroscopic analysis of SmMn2O5

Synthesis and Room Temperature Structural, Optical, Electrical Properties of Holmium Doped GdMn2O5 Multiferroics

Structural and spectroscopic analysis of HoMn2O5 multiferroics

Contact Info

Product

Resources

About

Optical and dielectric spectroscopic analysis of SmMn₂O₅

Optical and dielectric spectroscopic analysis of SmMn₂O₅

Synthesis and Room Temperature Structural, Optical, Electrical Properties of Holmium Doped GdMn₂O₅ Multiferroics

Structural and spectroscopic analysis of HoMn₂O₅ multiferroics