Frequency shifts of infrared active phonon modes in orthorhombic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si0025.gif" overflow="scroll"><mml:msub subscriptshift="65%"><mml:mrow><mml:mi>Dy</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo form="prefix">−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:math>Y x Mn 2 O 5

Ahmad, Javed; Rahmani, Mehr Khalid; Mansoor, Jawaria; Jamil, Muhammad; Sultan, Tahir; Bukhari, Syed Hamad

doi:10.1016/j.physb.2017.03.017

Cited by 11 publications

(2 citation statements)

References 21 publications

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“…28 The UV visible spectra of similar compounds like TbMn 2 O 5 were studied by S. Sadeghi et al 29 and reported that the energy band gap of TbMn 2 O 5 is 1.6 eV indicating that the synthesized nanocomposite is in the semiconductor region. Javed Ahmad et al 30 reported the band gap of DyMn 2 O 5 is 1.57 eV. They even observed that, the band gap estimated through optical conductivity is 1.78 eV.…”

Section: Resultsmentioning

confidence: 97%

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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Section: Resultsmentioning

confidence: 97%

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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“…The dispersion parameters (S , ) were calculated from the finest fitted IR to the experimental data. Longitudinal optical phonon modes LO j ( )wshows the relationship between the imaginary loss function (Im(−1/e)) as of the fitted spectrum of IR reflectivity and the famous Lyddane-Sachs-Taller formula developed for the analysis of the longitudinal optical phonon modes LO j ( ) w[16]. The calculated values of TO j ( )wand LO j ( )…”

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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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Spectroscopic analysis of NdMn2O5 by optical and transport mechanism

Abbas

Bukhari²,

Ahmad

2021

Appl. Phys. A

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Frequency shifts of infrared active phonon modes in orthorhombicDy1−xY x Mn 2 O 5

Cited by 11 publications

References 21 publications

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

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

Structural and spectroscopic analysis of HoMn₂O₅ multiferroics

Spectroscopic analysis of NdMn2O5 by optical and transport mechanism

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Frequency shifts of infrared active phonon modes in orthorhombicDy1−xY x Mn 2 O 5

Cited by 11 publications

References 21 publications

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

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

Structural and spectroscopic analysis of HoMn2O5 multiferroics

Spectroscopic analysis of NdMn2O5 by optical and transport mechanism

Contact Info

Product

Resources

About

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

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

Structural and spectroscopic analysis of HoMn₂O₅ multiferroics