Oxygen defects induced tailored optical and magnetic properties of FexCr2−xO3 (0 ≤ x ≤ 0.1) nanoparticles

Bhardwaj, Pradeep; Singh, Jarnail; Kumar, Rajesh; Kumar, Dinesh; Verma, Vikram

doi:10.1007/s00339-021-05233-x

Cited by 10 publications

(4 citation statements)

References 43 publications

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“…The E g active mode at 300 cm –1 is attributed to the symmetric bending of oxygen in tetrahedral coordination with the divalent metal ion (M 2+ –O). Finally, in spinel, the A 1g active mode at 677 cm –1 is ascribed to the local lattice effect observed in the sublattice of the tetrahedral site and symmetric stretching of the metal-oxygen bond in tetrahedral coordination (M 2+ –O), which affirms a complete disordered occupancy of various metal cations in the tetrahedral sight. , A slight variation in the shape of all the Raman peaks with the temperature rise may be due to the optical phonon confinement in the case of nanomaterial change in the grain size, variation in ionic radii, and states of multiple cations and lattice expansion as confirmed from XRD. ,,, The successful synthesis of HEO with the disordered occupancy of multiple cations (Co, Mn, Ni, Cr, Fr, and Cr) in tetrahedral and octahedral sites of the spinel structure is confirmed by the results of Raman spectroscopy. In contrast, the FTIR spectra of HEO-400 and HEO-1000 are illustrated in Figure b.…”

Section: Resultsmentioning

confidence: 97%

Evolution of High Dielectric Permittivity in Low-Temperature Solution Combustion-Processed Phase-Pure High Entropy Oxide (CoMnNiFeCr)O for Thin Film Transistors

Salian

Pujar

Vardhan

et al. 2023

ACS Appl. Electron. Mater.

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An investigation of dielectric permittivity on the sintered high entropy oxide (HEO) capacitor composed of Co, Cr, Fe, Mn, and Ni (i.e., (CoCrFeMnNi)O) developed using solution combustion synthesis is performed. Stabilization of the phase in HEO is extremely important as it has a direct influence on the properties. In order to explore phase stabilization, in-depth studies of thermal, structural, morphological, and compositional analyses are carried out. The optimized processing parameters are further implemented on depositing (CoCrFeMnNi)O dielectric thin films followed by a thin film transistor. Irrespective of the reaction medium, the precursors undergo combustion at a low temperature below 250 °C, resulting in amorphous HEO. Upon crystallization at 500 °C, no secondary impurity oxides were detected and phase-stabilized to a spinel structure (Fd3m). A homogeneous distribution of all five cations without any segregation and a completely disordered occupancy of the cations were displayed by the bulk and thin films of HEOs. The spinel (CoCrFeMnNi)O exhibited high permittivity, with values approximately 7.3 × 102 (in bulk) and 3 × 101 (in a thin film), measured at 1 kHz owing to the entropy stabilization effect of HEO. Due to their high permittivity and low leakage current density (∼10–8 A/cm2), the (CoMnNiFeCr)O thin film was integrated into thin film transistors (TFTs) with molybdenum disulfide-channel. TFTs showed a field effect mobility of 8.8 cm2 V–1 s–1, an on–off ratio of approximately 105, a threshold voltage of −1.5 V, and a subthreshold swing of 0.38 V/dec. The low voltage operation (<5 V) of these TFTs makes solution combustion-derived HEO (CoMnNiFeCr)O a potential candidate in microelectronics and optoelectronics applications.

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Section: Resultsmentioning

confidence: 97%

Evolution of High Dielectric Permittivity in Low-Temperature Solution Combustion-Processed Phase-Pure High Entropy Oxide (CoMnNiFeCr)O for Thin Film Transistors

Salian

Pujar

Vardhan

et al. 2023

ACS Appl. Electron. Mater.

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“…[ 36 ] Sarkar et al reported room temperature antiferromagnetic of Nd 1.90 Co 0.10 O 3− δ nanocrystalline and confirmed that the antiferromagnetic to ferromagnetic phase transition occurs at about 100 K. [ 28 ] Fe x Cr 2− x O 3 nanoparticles were reported to have the same magnetic transition and confirmed that oxygen defects are a key factor to induce magnetic behavior by the bound magnetic polaritons (BMP) model. [ 37 ] In Figure 4, the BMP model is applied to further analyze the origin of the magnetic transition. The M–H curves can be fitted by the following formula [ 27–29,37 ]

$$M \left(\right.

…”

Section: Resultsmentioning

confidence: 99%

“…[ 37 ] In Figure 4, the BMP model is applied to further analyze the origin of the magnetic transition. The M–H curves can be fitted by the following formula [ 27–29,37 ]

$$M \left(\right. H \left.\right) = M_{0} L \left(\right.

…”

Section: Resultsmentioning

confidence: 99%

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Crystal Growth and Physical Properties Evolution in Co‐Doped NiTe₂ System

Chen

Gao

et al. 2023

Physica Status Solidi (b)

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Transition metal tellurides have been widely studied for their diverse crystal structures and exotic physical properties such as large magnetoresistance, charge density waves, superconductivity, ferromagnetic and topological properties. NiTe2 has recently been found to be a Dirac semimetal, allowing it to achieve exotic properties by pressure and doping. A series of Ni1−xCoxTe2−δ single crystals are synthesized by the standard solid‐state reaction method. The energy‐dispersive X‐ray spectroscopy and X‐ray diffraction tests confirm Co is successfully doped into the crystal structure. The electrical transport measurements show typical metallic behaviors for all the samples. Magnetization measurements reveal that, in the doping range of x = 0.12–0.62, the samples exhibit a coexistence of antiferromagnetic and paramagnetic phases above the characteristic temperature Tt. By using the combined Curie–Weiss and spin‐wave model, the antiferromagnetic to ferromagnetic transition is found to occur as the temperature drops below Tt. The magnetic transition is attributed to the Te vacancies, which can be explained using the bound magnetic polaritons model. A magnetic phase diagram for Ni1−xCoxTe2−δ system is constructed.

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Transition Metal (Mn, Ni) Co-doped CdO Nanoparticles: Demonstration of Structural, Optical, and Magnetic Properties

Leelavati

Singh

Bhardwaj

2022

J Supercond Nov Magn

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Oxygen defects induced tailored optical and magnetic properties of FexCr2−xO3 (0 ≤ x ≤ 0.1) nanoparticles

Cited by 10 publications

References 43 publications

Evolution of High Dielectric Permittivity in Low-Temperature Solution Combustion-Processed Phase-Pure High Entropy Oxide (CoMnNiFeCr)O for Thin Film Transistors

Evolution of High Dielectric Permittivity in Low-Temperature Solution Combustion-Processed Phase-Pure High Entropy Oxide (CoMnNiFeCr)O for Thin Film Transistors

Crystal Growth and Physical Properties Evolution in Co‐Doped NiTe₂ System

Transition Metal (Mn, Ni) Co-doped CdO Nanoparticles: Demonstration of Structural, Optical, and Magnetic Properties

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Oxygen defects induced tailored optical and magnetic properties of FexCr2−xO3 (0 ≤ x ≤ 0.1) nanoparticles

Cited by 10 publications

References 43 publications

Evolution of High Dielectric Permittivity in Low-Temperature Solution Combustion-Processed Phase-Pure High Entropy Oxide (CoMnNiFeCr)O for Thin Film Transistors

Evolution of High Dielectric Permittivity in Low-Temperature Solution Combustion-Processed Phase-Pure High Entropy Oxide (CoMnNiFeCr)O for Thin Film Transistors

Crystal Growth and Physical Properties Evolution in Co‐Doped NiTe2 System

Transition Metal (Mn, Ni) Co-doped CdO Nanoparticles: Demonstration of Structural, Optical, and Magnetic Properties

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Crystal Growth and Physical Properties Evolution in Co‐Doped NiTe₂ System