Oxygen vacancy mediated room-temperature ferromagnetism and band gap narrowing in DyFe0.5Cr0.5O3 nanoparticles

Hossain, Rana; Billah, Areef; Ishizaki, Manabu; Kubota, Shigeru; Hirose, Fumihiko; Ahmmad, Bashir

doi:10.1039/d1dt00438g

Cited by 11 publications

(2 citation statements)

References 79 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These three peaks can be attributed to metal-oxygen bonds, oxygen vacancies, and surfaceadsorbed hydroxyl groups, respectively, with the molar ratio of 21%:61%:14% [69]. The oxygen vacancy (61%) of disordered YNCO double perovskite is much larger than the oxygen vacancy (35%) of a similar Dy-based transition metal double perovskite [72]. These mixed valence states of Ni and Cr ions indicate that the YNCO material is B-site disordered, which might influence the magnetic properties presented in the magnetic characterization section.…”

Section: Xps Analysismentioning

confidence: 95%

B-site disorder driven Griffiths-like phase and electrochemical behavior in Y₂NiCrO₆ double perovskite

Islam,

Tarek,

Asif Adib

et al. 2024

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

In this investigation, nanoparticles of B-site disordered Y2NiCrO6 (YNCO) double perovskite were synthesized by the facile sol-gel method to evaluate their magnetic and electrochemical properties. Their crystallgraphic structure is monoclinic and the average size of the particles is 79±16 nm. XPS analysis indicated a mixed oxidation states of B-site transition metals Ni2+/Ni3+ and Cr2+/Cr3+. The mixed valence states of Ni and Cr, along with the mixed magnetic phases of YNCO, constitute a signature of the B-site disorder. This antisite disorder contributed to the observation of a Griffiths-like phase arising from ferromagnetic short-range interactions above the magnetic transition up to the Griffiths temperature, TG=137 K. The synthesized YNCO double perovskite demonstrated a promising behavior as an electrode material for electrochemical supercapacitors. In a three-electrode system, it displayed a specific capacitance of 270 F g-1 at a current density of 0.5 A g-1. In a symmetric two-electrode system, YNCO exhibited a specific capacitance of 180 F g-1 at 0.5 A g-1, alongside an energy density of 6.25 Wh kg-1 at 250 W kg-1 power density. In both cases, we employed a mild 0.5 M neutral aqueous Na2SO4 solution as the electrolyte, in contrast to the typically employed corrosive and concentrated alkaline aqueous solution. The fascinating magnetic and charge storage properties of the B-site disordered YNCO double perovskite indicate its potential for use in spintronic devices and as efficient electrodes in symmetric hybrid supercapacitors.

show abstract

Section: Xps Analysismentioning

confidence: 95%

B-site disorder driven Griffiths-like phase and electrochemical behavior in Y₂NiCrO₆ double perovskite

Islam,

Tarek,

Asif Adib

et al. 2024

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

show abstract

“…Additionally, the LaAlO 3 lattice will release oxygen atoms and create oxygen vacancies [8,[28][29][30][31] at high temperatures, leading to a dramatic decrease in reflectivity, according to the phase transition mechanism. The band gap of LaAlO 3 narrows as a result of the creation of oxygen vacancies and defect energy levels within the band gap [32][33][34][35][36]. Additionally, the oxygen vacancies will distort the perfect cubic perovskite lattice of LaAlO 3 to some extent, lowering the material's reflectivity.…”

Section: Introductionmentioning

confidence: 99%

Optimizing the Structure and Optical Properties of Lanthanum Aluminate Perovskite through Nb5+ Doping

Liu,

Zou,

Chen

et al. 2024

Nanomaterials

View full text Add to dashboard Cite

This work involves the introduction of niobium oxide into lanthanum aluminate (LaAlO3) via a conventional solid-state reaction technique to yield LaAlO3:Nb (LaNbxAl1−xO3+δ) samples with Nb5+ doping levels ranging from 0.00 to 0.25 mol%. This study presents a comprehensive investigation of the effects of niobium doping on the phase evolution, defect control, and reflectance of LaNbxAl1−xO3+δ powder. Powder X-ray diffraction (XRD) analysis confirms the perovskite structure in all powders, and XRD and transmission electron microscopy (TEM) reveal successful doping of Nb5+ into LaNbxAl1−xO3+δ. The surface morphology was analyzed by scanning electron microscopy (SEM), and the results show that increasing the doping concentration of niobium leads to fewer microstructural defects. Oxygen vacancy defects in different compositions are analyzed at 300 K, and as the doping level increases, a clear trend of defect reduction is observed. Notably, LaNbxAl1−xO3+δ with 0.15 mol% Nb5+ exhibits excellent reflectance properties, with a maximum infrared reflectance of 99.7%. This study shows that LaNbxAl1−xO3+δ powder materials have wide application potential in the field of high reflectivity coating materials due to their extremely low microstructural defects and oxygen vacancy defects.

show abstract

Adsorption and photocatalytic study of dyes for waste-water treatment using Mn modified DyCrO3 nanomaterials

Rani,

Singh,

Panwar

2023

J Sol-Gel Sci Technol

View full text Add to dashboard Cite

Oxygen vacancy mediated room-temperature ferromagnetism and band gap narrowing in DyFe_0.5Cr_0.5O₃ nanoparticles

Abstract: We report on the magnetic and optical properties of DyFe0.5Cr0.5O3 nanoparticles synthesized by sol-gel method. Rietveld refinement of powder X-ray diffraction (XRD) pattern confirms the formation of orthorhombic disordered phase...

Cited by 11 publications

References 79 publications

B-site disorder driven Griffiths-like phase and electrochemical behavior in Y₂NiCrO₆ double perovskite

B-site disorder driven Griffiths-like phase and electrochemical behavior in Y₂NiCrO₆ double perovskite

Optimizing the Structure and Optical Properties of Lanthanum Aluminate Perovskite through Nb5+ Doping

Adsorption and photocatalytic study of dyes for waste-water treatment using Mn modified DyCrO3 nanomaterials

Contact Info

Product

Resources

About

Oxygen vacancy mediated room-temperature ferromagnetism and band gap narrowing in DyFe0.5Cr0.5O3 nanoparticles

Abstract: We report on the magnetic and optical properties of DyFe0.5Cr0.5O3 nanoparticles synthesized by sol-gel method. Rietveld refinement of powder X-ray diffraction (XRD) pattern confirms the formation of orthorhombic disordered phase...

Cited by 11 publications

References 79 publications

B-site disorder driven Griffiths-like phase and electrochemical behavior in Y2NiCrO6 double perovskite

B-site disorder driven Griffiths-like phase and electrochemical behavior in Y2NiCrO6 double perovskite

Optimizing the Structure and Optical Properties of Lanthanum Aluminate Perovskite through Nb5+ Doping

Adsorption and photocatalytic study of dyes for waste-water treatment using Mn modified DyCrO3 nanomaterials

Contact Info

Product

Resources

About

Oxygen vacancy mediated room-temperature ferromagnetism and band gap narrowing in DyFe_0.5Cr_0.5O₃ nanoparticles

B-site disorder driven Griffiths-like phase and electrochemical behavior in Y₂NiCrO₆ double perovskite

B-site disorder driven Griffiths-like phase and electrochemical behavior in Y₂NiCrO₆ double perovskite