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• W4307023730 abstract "Abstract Nanocrystalline new double perovskites La 2-x Gd x CrMnO 6 (x = 0.5, 1.0, 1.5 and 2.0) have been prepared by employing auto-combustion sol-gel method. Herein, we investigate the influence of Gd 3+ on structural, optical and transport properties of La 2 CrMnO 6 . The Rietveld refinement reveals that the said materials crystallize in orthorhombic structure with Pbnm space group symmetry. The vibrational phonon modes have been examined using the infrared reflectance technique and were fitted using the Lorentz oscillator model. The spectra contain various IR active phonon modes. The position and width of these modes were determined and correlated with ionic substitution at the A-site. The optical conductivity shows the semiconducting nature of the series. The Raman spectra with active modes were also studied in connection with substitution. The optical bandgap varies from (1.62–1.67 eV) which has been estimated from diffuse reflectance spectra and found to increase with substitution whereas the Urbach energy decreases with increasing Gd 3+ content. A significant change has been observed in resistive response and the resistivity vary from <?CDATA $left(1.8,* ,{10}^{5}{rm{Omega }}-{rm{cm}}right)$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mfenced close=) open=( separators=> <mml:mrow> <mml:mn>1.8</mml:mn> <mml:mspace width=0.25em /> <mml:mo>*</mml:mo> <mml:mspace width=0.25em /> <mml:msup> <mml:mrow> <mml:mn>10</mml:mn> </mml:mrow> <mml:mn>5</mml:mn> </mml:msup> <mml:mi mathvariant=normal>Ω</mml:mi> <mml:mo>−</mml:mo> <mml:mi mathvariant=normal>cm</mml:mi> </mml:mrow> </mml:mfenced> </mml:math> to <?CDATA $(3.5,* ,{10}^{3}{rm{Omega }}-{rm{cm}}).$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mo stretchy=false>(</mml:mo> <mml:mn>3.5</mml:mn> <mml:mspace width=0.25em /> <mml:mo>*</mml:mo> <mml:mspace width=0.25em /> <mml:msup> <mml:mrow> <mml:mn>10</mml:mn> </mml:mrow> <mml:mn>3</mml:mn> </mml:msup> <mml:mi mathvariant=normal>Ω</mml:mi> <mml:mo>−</mml:mo> <mml:mi mathvariant=normal>cm</mml:mi> <mml:mo stretchy=false>)</mml:mo> <mml:mo>.</mml:mo> </mml:math> The crossover behaviour at ∼ <?CDATA $400{rm{K}}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mn>400</mml:mn> <mml:mi mathvariant=normal>K</mml:mi> </mml:math> from variable range hopping to small polaron hopping has been observed." @default.
• W4307023730 created "2022-10-22" @default.
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• W4307023730 date "2022-11-03" @default.
• W4307023730 modified "2023-09-25" @default.
• W4307023730 title "Effect of A-site Gd³⁺ substitution on structural, optical and electrical properties of La_2−xGd_xCrMnO₆ double perovskites" @default.
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• W4307023730 doi "https://doi.org/10.1088/1402-4896/ac9c9e" @default.
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