Crystal structures and magnetic properties of strontium and copper doped lanthanum ferrites

Sora, Isabella Natali; Caronna, Tullio; Fontana, Francesca; Fernández, César de Julián; Caneschi, Andréa; Green, Mark

doi:10.1016/j.jssc.2012.02.020

Cited by 55 publications

(9 citation statements)

References 39 publications

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“…LF with a typical ABO 3 -type perovskite structure (A is usually a rare earth and B is a transition metal) has proven to be effective on catalytic reactions owing to its significant properties as high stability and nontoxicity [13,14]. Furthermore, La ferrites, either sole or modified with various doping elements i.e., Cu, Sr, has been extensively investigated by Natali Sora et al [15][16][17][18][19][20][21][22][23][24][25]. Focusing on specific application of La ferrites, reduction in eco-toxic effects of micropollutants was achieved via photocatalytic degradation [26].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Degradation of Humic Acids Using LaFeO3

et al. 2018

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TiO2 photocatalytic degradation of dissolved organic matter (DOM), namely humic substances composed of humic (HA) and fulvic acids, has been investigated for decades. However, the application of non-TiO2 photocatalysis for this purpose has only received recent attention. Aiming to fill this gap, this study was performed to elucidate the photocatalytic degradation of HAs using the novel photocatalyst LaFeO3 (LF) under simulated solar light irradiation. HA was selectively fractionated by ultrafiltration to two different molecular size fractions representing high molecular fraction as 100 kDa and lower molecular size fraction comprised of humic components expressing size fractions smaller than 30 kDa. Photocatalyst LF was prepared by the citrate auto-combustion method and characterized by using various techniques and Brunauer–Emmett–Teller (BET) surface area. Ultraviolet (UV)-vis and excitation-emission matrix (EEM) fluorescence spectroscopic features were used to characterize the treated HA and photocatalytic mineralization extend was followed by dissolved organic carbon (DOC) contents. Photocatalytic performance of LF was compared to the metal modified version as Cu-doped LF. Highest mineralization was achieved upon the use of a photocatalyst dose of 0.25 mg/mL of LaFe0.90Cu0.10O3−δ (Cu-LF) for 30 kDaHA, whereas lowest mineralization was attained for 100 kDaHA upon the use of LF. Photocatalytic degradation kinetics indicated the possible use of LF and Cu-LF for the degradation of HA.

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Section: Introductionmentioning

confidence: 99%

Photocatalytic Degradation of Humic Acids Using LaFeO3

et al. 2018

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“…These modifications are associated with the route of mechano-synthesis, which is known to form nanoparticles with a non-uniform core–shell structure in which the exchange interactions between the inner crystalline core and an outer disordered or amorphous shell often result in novel physical properties 15 , 16 . To the best of our knowledge, few studies have been devoted to the case in which both La 3+ and Fe 3+ cations in LaFeO 3 nanoparticles are concurrently substituted 17 – 19 . Such co-doping was found to lead to notable changes in the magnetic and ferroelectric properties, as was shown for the La 0.8 Sr 0.2 Fe 1− x Cu x O 3 , La 0.9 Dy 0.1 Fe 0.9 Ti 0.1 O 3 and La 1− x Dy x Fe 1− y Mn y O 3 nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Core and surface structure and magnetic properties of mechano-synthesized LaFeO3 nanoparticles and their Eu3+-doped and Eu3+/Cr3+-co-doped variants

Al-Mamari,

Widatallah,

Elzain

et al. 2024

Sci Rep

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The core and surface structure, and magnetism of mechano-synthesized LaFeO3 nanoparticles (30–40 nm), Eu3+-doped (La0.70Eu0.30FeO3), and Eu3+/Cr3+ co-doped (La0.70Eu0.30Fe0.95Cr0.05O3) are reported. Doping results in a transition from the O′-type to the O-type distorted structure. Traces of reactants, intermediate phases, and a small amount of Eu2+ ions were detected on the surfaces of the nanoparticles. The nanoparticles consist of antiferromagnetic cores flanked by ferromagnetic shells. The Eu3+ dopant ions enhance the magnetization values relative to those of the pristine nanoparticles and result in magnetic susceptibilities compatible with the presence of Eu3+ van Vleck paramagnetism of spin–orbit coupling constant (λ = 363 cm−1) and a low temperature Curie–Weiss like behavior associated with the minority Eu2+ ions. Anomalous temperature-dependent magnetic hardening due to competing magnetic anisotropy and magnetoelectric coupling effects together with a temperature-dependent dopant-sensitive exchange bias, caused by thermally activated spin reversals at the core of the nanoparticles, were observed.

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“…The properties of the perovskites are mainly determined by the element, substitution, and occupation of the B sites [57]. In this sense, perovskites doped with noble metals (AB 1−y M y O 3 ) may present improved stability and catalytic activity.…”

Section: Sensing Of Glucosementioning

confidence: 99%

Electrochemical Perovskite-Based Sensors for the Detection of Relevant Biomarkers for Human Kidney Health

Piñón-Balderrama,

Leyva-Porras,

Conejo-Dávila

et al. 2023

Chemosensors

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The importance of biomarker quantification in technology cannot be overstated. It has numerous applications in medical diagnostics, drug delivery, and the timely implementation of prevention and control strategies for highly prevalent diseases worldwide. However, the discovery of new tools for detection has become increasingly necessary. One promising avenue is the use of perovskite-based materials, which exhibit excellent catalytic activity and redox properties. These make them ideal candidates for the development of electrochemical sensors. In this review, the advances of purely non-enzymatic electrochemical detection of bio-analytes, with ABO3 perovskite form, are presented. The work allows the visualization of some of the modifications in the composition and crystal lattice of the perovskites and some variations in the assembly of the electrodes, which can result in systems with a better response to the detection of analytes of interest. These findings have significant implications for improving the accuracy and speed of biomarker detection, ultimately benefiting patients and healthcare professionals alike.

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Crystal structures and magnetic properties of strontium and copper doped lanthanum ferrites

Cited by 55 publications

References 39 publications

Photocatalytic Degradation of Humic Acids Using LaFeO3

Photocatalytic Degradation of Humic Acids Using LaFeO3

Core and surface structure and magnetic properties of mechano-synthesized LaFeO3 nanoparticles and their Eu3+-doped and Eu3+/Cr3+-co-doped variants

Electrochemical Perovskite-Based Sensors for the Detection of Relevant Biomarkers for Human Kidney Health

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