Structural, morphological and dielectric investigation of spinel chromite (XCr2O4, X = Zn, Mn, Cu &amp; Fe) nanoparticles

Shafqat, M. Burhan; Ali, Muhammad Danish; Atiq, Shahid; Ramay, Shahid M.; Shaikh, Hamid; Naseem, Shahzad

doi:10.1007/s10854-019-02111-4

Cited by 12 publications

(5 citation statements)

References 25 publications

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“…The peak, which was identified as a second‐order overtone of dysprosium chromite, was attributed to the Raman mode of cuprous oxide crystals 312 at 317 cm −1 . A peak at 416 cm −1 was attributed to a 4‐phonon mode 3

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− 12 +

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− 25 [26].…”

Section: Resultsmentioning

confidence: 99%

A comprehensive examination of structural modifications, optical characteristics, and electrochemical analysis of magnesium‐doped dysprosium chromite

Saleemi,

Albaqami,

Mohammad

et al. 2024

J Chinese Chemical Soc

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BackgroundThis study focuses on the synthesis of magnesium‐doped dysprosium chromite via a sol‐gel method. The investigation aims to understand the morphological and structural properties of the synthesized nanochromates. Key techniques employed include x‐ray diffraction (XRD), scanning electron microscopy (SEM), and Raman spectroscopy.AimsThe primary aim is to analyze the structural characteristics of MgxDy1−xCr2O4 nanoparticles with varying Mg doping concentrations (ranging from 0.2 to 0.8). Special attention is given to the crystallinity of the synthesized materials, with the goal of assessing the reliability and reproducibility of the sol‐gel synthesis method.MethodsXRD analysis is employed to identify major diffraction peaks associated with the chromate nanoparticles, providing insights into their crystallinity. SEM imaging allows for the examination of the morphological features of the synthesized materials. Additionally, Raman spectroscopy aids in further understanding the structural properties of the nanochromates.ResultsThe XRD analysis reveals average crystallite sizes for MgxDy1−xCr2O4 nanoparticles at different Mg doping concentrations. Notably, an improvement in crystalline quality is observed with an increase in Mg doping from 0.2 to 0.8, indicating a high level of control achieved in the synthesis process. Cyclic Voltammetry (CV) experiments conducted using a 1M KOH electrolyte and varying scan rates (3 mV/s to 50 mV/s) demonstrate enhanced electrochemical performance of the synthesized nanoparticles.ConclusionThe study concludes that the sol‐gel synthesis method effectively produces MgxDy1−xCr2O4 nanoparticles with controlled morphological and structural properties. The observed improvement in crystalline quality with increasing Mg doping concentration suggests potential applications in fields such as photo‐catalysis, where enhanced crystallinity correlates with improved photo‐catalytic potential for visible light absorption.

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Γ

− 12 +

Γ

− 25 [26].…”

Section: Resultsmentioning

confidence: 99%

A comprehensive examination of structural modifications, optical characteristics, and electrochemical analysis of magnesium‐doped dysprosium chromite

Saleemi,

Albaqami,

Mohammad

et al. 2024

J Chinese Chemical Soc

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“…S1c), and the Raman spectrum was consistent with the structure of a spinel in the literature. 48,49 Despite the volume of work on XPS of passive films on FeCr alloys and stainless steels, only a few of these analysed films were grown in the potential region where FeCr 2 O 4 is predicted by the Pourbaix diagrams in Fig. 9, which is also the region where the ORR onset potential occurs (Table II).…”

Section: Forward Scanmentioning

confidence: 99%

The Role of Oxygen Reduction Reaction in Determining Pit Stability of FeCr Alloys

Blackwood¹,

Ying²,

Ng³

et al. 2023

J. Electrochem. Soc.

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Pitting corrosion is one of the most dangerous forms of corrosion, leading to sudden catastrophic failures in engineering systems. Once initiated, pit propagation rates are largely dependent on the magnitude of the supporting cathodic current available from the oxygen reduction reaction (ORR) occurring on the external passive film. Here the ORR kinetics on conventional and high Cr content FeCr alloys made by arc-melter were investigated by experimental and computational methods. Density functional theory calculations suggested that the overpotentials for the ORR on FeCr oxides are in the order Cr2O3 > Fe3O4 > Fe2O3 > FeCr2O4, which was experimentally confirmed on the FeCr alloys by rotating disc electrode experiments in both O2 saturated 0.1 M NaOH and 3.5 wt% NaCl. Koutecky-Levich analysis demonstrated that ORR follows a 4-electron pathway on all surfaces investigated. Moreover, the investigation of the Pourbaix diagrams of FeCr revealed that at potentials where pitting corrosion initiates the main constituents of the passive films should be a mixture of Fe2O3 and Cr2O3, rather than FeCr2O4, which is proved to be a good ORR catalyst. The results support the postulation that one role Cr additions play in the prevention of pitting corrosion is to suppress the ORR reaction.

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“…Consequently, the dielectric constant is high in this region. These phenomena begin to fade gradually causing a decrease in the dielectric constant with rising frequency [59][60][61]. At higher frequencies, the dielectric constant reaches a constant value where after certain frequency the electron exchange between Zn 2+ and Cr 3+ or/and Mn 2+ cannot obey the applied alternating field.…”

Section: Dielectric Constant (ε′)mentioning

confidence: 99%

Role of Mn/Cr dual-doped ZnO nanoparticles of diluted magnetic semiconductors: influence on structural and electrical properties

2021

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Sol-gel method was used to successfully produce dilute magnetic semiconductor ( Zn 1−x−y Mn x Cr y O) nanoparticles. Fourier transforms infrared spectroscopy (FTIR) and electrical conductivity tests were used to investigate the structural and electrical properties of the prepared samples. FTIR spectra are used to examine the functional chemical bonding properties of various elements and compounds found in materials. The dopant's incorporation into the ZnO framework structure is confirmed by FTIR spectra. The dominance of the Mn-O or Cr-O interaction in the Zn-O-Mn or Zn-O-Cr bonds may result from an increase in Mn or Cr concentration in the wurtzite structure, which could lead to structural stress and defects. Within the frequency range of 0.042 kHz-1 MHz and the temperature range of 298-573(K), the conductivity (σ ac ) was measured. The increase in conductivity values is more pronounced for samples with lower doping concentrations of Mn and Cr. The maximum σ ac value is reached in the sample with 1.5% Mn and 0.5% Cr. The maximum ɛʹ value reached in the sample with 10% Cr. The prepared samples are considered as candidates for semiconductor materials in electronic devices.

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Structural, morphological and dielectric investigation of spinel chromite (XCr2O4, X = Zn, Mn, Cu & Fe) nanoparticles

Cited by 12 publications

References 25 publications

A comprehensive examination of structural modifications, optical characteristics, and electrochemical analysis of magnesium‐doped dysprosium chromite

A comprehensive examination of structural modifications, optical characteristics, and electrochemical analysis of magnesium‐doped dysprosium chromite

The Role of Oxygen Reduction Reaction in Determining Pit Stability of FeCr Alloys

Role of Mn/Cr dual-doped ZnO nanoparticles of diluted magnetic semiconductors: influence on structural and electrical properties

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