Structural, electrical, dielectric and optical properties of PrCrO3 ortho-chromite

Mguedla, R.; Kharrat, A. Ben Jazia; Saadi, Meriem; Khirouni, K.; Chniba-Boudjada, N.; Boujelben, W.

doi:10.1016/j.jallcom.2019.152130

Cited by 61 publications

(13 citation statements)

References 54 publications

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“…Among these, the peak at 746cm -1 is attributed to the asymmetric tensile vibration of the Ge-O-Ge bond, the peak at 512 cm -1 is attributed to the symmetrical tensile vibration of the Ge-O-Ge bond, and the peak at 425 cm -1 can be attributed to the deformation vibration of O-Cr-O bond. This observation also con rms that Cr 4+ ions are indeed doped into Li 2 TiGeO 5 [19][20][21]. At the same time, with the increase in the Cr 4+ ions doping concentration, the vibration of the Ge-O bond increases, and the peak at 878 cm -1 increases.…”

Section: Resultssupporting

confidence: 68%

Near-infrared luminescence investigation of Cr4+ ions doped Li2TiGeO5

Wang

Jiang

Leng

et al. 2021

J Mater Sci: Mater Electron

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In this paper, the preparation of a series of Li 2 TiGe 1-x Cr x O 5 phosphors by high-temperature solid-state reaction is reported. The results of X-ray diffraction show that the doping of Cr 4+ ions makes the lattice expand to a larger size. X-ray photoelectron spectroscopy (XPS) analysis shows that the chromium ions in the sample are tetravalent, con rmed further by uorescence spectroscopy. Under the excitation of 980nm laser, the Cr 4+ ions 3 T 2 doped 3 A 2 radiates transition and emits light at 1300nm. At the same time, the luminescence lifetime decreases with the increase in Cr 4+ ions doping concentration. Li 2 TiGe 1-x Cr x O 5 phosphors have a broad application prospect in near-infrared LEDs. Highlights 1. The Li 2 TiGe 1-x Cr x O 5 phosphor was prepared by the high-temperature solid-phase reaction method.2. The luminescence lifetime decreases with the increase in Cr 4+ ions doping concentration.. 3. Li 2 TiGe 1-x Cr x O 5 phosphors have a broad application prospect in near-infrared LEDs..

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Section: Resultssupporting

confidence: 68%

Near-infrared luminescence investigation of Cr4+ ions doped Li2TiGeO5

Wang

Jiang

Leng

et al. 2021

J Mater Sci: Mater Electron

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“…However, at low frequency the existence of oxygen vacancies, grain boundaries traps, Fe 2+ ions etc. [63] generate a high value of imaginary part ε" .In addition, imaginary part ε" increase with temperature rise which activate thermally carrier for hopping process which confirms the semiconductor comportment of our sample . Furthermore, permittivity ε" can be analyzed by the Giuntini theory [64] (the linear fit Fig.…”

Section: Dielectric Studysupporting

confidence: 80%

“…Furthermore, permittivity ε" can be analyzed by the Giuntini theory [64] (the linear fit Fig. 7) which has been successfully applied to many materials such as; manganites, perovskites, and spinel ferrites [63,65,66]. Basing to the Giuntini model, the imaginary part of permittivity ε" is given by the following expression [64]:…”

Section: Dielectric Studymentioning

confidence: 99%

Structural, Dielectric and Electrical Properties of Sol-Gel Auto-Combustion Technic of CuFeCr0.5Ni0.5O4 Ferrite

Rejeiba¹,

Hcini²,

Nasri³

et al. 2021

Preprint

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The CuFeCr0.5Ni0.5O4 (CFO) compound was synthesized using sol-gel reaction combustion technic. The structural analysis showed that the obtained composites have a polycrystalline nature and the cubic spinel structure ( space group). Microstructural analysis revealed the formation of spherical and elongated grains of our sample. The dielectric and electrical transport properties of CuFeCr0.5Ni0.5O4 were investigated in detail by Ac impedance spectroscopy in a wide range of temperature (200 K-400 K) and frequency (100Hz to100KHz). Our results show that the electrical modulus and impedance studies confirm the presence of a relaxation phenomenon with non-Debye type in the prepared sample. The activation energy Edc estimated from the slope of the linear fit plot is equal to 0.158 eV with frequency of 100Hz and 0.126 eV with frequency of 1MHz at temperature range 200K-400K. Close activation energies values were found from analyzes of relaxation time and dc-conductivity indicating that the relaxation and the conduction processes may be attributed to the presence of free carrier charges and impurities at the grain boundaries. The conduction process for samples is described by the NSPT model. The complex impedance analyses and modulus formalism confirm a grain and grain boundary mechanism contributing to the dielectric properties. The real and the imaginary parts of the impedance are well ﬁtted to equivalent electrical circuit (Rg+ Rgb//CPEgb) was used for modeling the Nyquist data.

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Section: Dielectric Studysupporting

confidence: 80%

Section: Dielectric Studymentioning

confidence: 99%

Structural, dielectric and electrical properties of Sol–gel auto-combustion technic of CuFeCr0.5Ni0.5O4 ferrite

et al. 2021

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The CuFeCr0.5Ni0.5O4 (CFO) compound was synthesized using sol-gel reaction combustion technic. The structural analysis showed that the obtained composites have a polycrystalline nature and the cubic spinel structure ( 3 ̅ space group). Microstructural analysis revealed the formation of spherical and elongated grains of our sample. The dielectric and electrical transport properties of CuFeCr0.5Ni0.5O4 were investigated in detail by Ac impedance spectroscopy in a wide range of temperature (200 K-400 K) and frequency (100Hz to100KHz). Our results show that the electrical modulus and impedance studies confirm the presence of a relaxation phenomenon with non-Debye type in the prepared sample. The activation energy Edc estimated from the slope of the linear fit plot is equal to 0.158 eV with frequency of 100Hz and 0.126 eV with frequency of 1MHz at temperature range 200K-400K.Close activation energies values were found from analyzes of relaxation time and dcconductivity indicating that the relaxation and the conduction processes may be attributed to the presence of free carrier charges and impurities at the grain boundaries. The conduction process for samples is described by the NSPT model. The complex impedance analyses and modulus formalism confirm a grain and grain boundary mechanism contributing to the dielectric properties. The real and the imaginary parts of the impedance are well fitted to equivalent electrical circuit (Rg+ Rgb//CPEgb) was used for modeling the Nyquist data.

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Structural, electrical, dielectric and optical properties of PrCrO3 ortho-chromite

Cited by 61 publications

References 54 publications

Near-infrared luminescence investigation of Cr4+ ions doped Li2TiGeO5

Near-infrared luminescence investigation of Cr4+ ions doped Li2TiGeO5

Structural, Dielectric and Electrical Properties of Sol-Gel Auto-Combustion Technic of CuFeCr0.5Ni0.5O4 Ferrite

Structural, dielectric and electrical properties of Sol–gel auto-combustion technic of CuFeCr0.5Ni0.5O4 ferrite

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