Room temperature ferromagnetism in Ag doped LaMnO3 nanoparticles

Afify, Mohamed S.; Faham, Mohamed M. El; Eldemerdash, Usama; Rouby, Waleed M. A. El; El-Dek, S.I.

doi:10.1016/j.jallcom.2020.158570

Cited by 26 publications

(12 citation statements)

References 56 publications

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“…The diffraction pattern indicates some additional peaks of unreacted metallic Ag and Mn 3 O 4 along with an as-synthesized compound [20]. Similar findings have been reported by various researchers [26][27][28]. Further nanocrystalline LABMO3 crystallizes in rhombohedral perovskite crystal structure (space group R 3C), which closely corresponds to the JCPDS card number 71-2494.…”

Section: Structural Propertiessupporting

confidence: 86%

Investigation of magnetic properties and colossal magnetoresistance in nanocrystalline doped manganite

Bisht,

Mahato

2023

J. Phys.: Condens. Matter

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Here in, we report structural, magnetic, and magneto-transport properties of nanocrystalline La0.6Ag0.2Bi0.2MnO3 prepared using citrate sol-gel method. By using scanning and transmission electron microscopy measurements, the morphology and particle size of the sample have been confirmed. The Mn2p XPS spectra revealed the nanoparticles contained the coexistence of Mn3+ and Mn4+ ions with Mn3+/Mn4+ ratio of 2:1. Field-cooled and zero field-cooled magnetization protocols with temperature span of 5 K – 300 K, confirm the paramagnetic to ferromagnetic phase transition at critical temperature, TC~146 K. The complete investigation of isothermal magnetization (130≤T (K)≤160,∆T=2 K), Arrott plots, and magnetocaloric effect as well as quantitative analysis of second-order phase transition has been studied. The criticality at the paramagnetic-ferromagnetic transition was examined for the sample, and the obtained critical exponents were verified for their reliability through the utilization of the scaling hypothesis and Kouvel - Fisher plot. We observed a large magnetic entropy change (~7 J-Kg-1K-1) at TC upon 5 T magnetic field strength. The renormalized magnetic entropy change plots are found to collapse onto a single curve, thus verifying the universality of the sample. Above the metal-insulator transitions the electrical resistivity shows a small polaron hopping conduction mechanism, however, at low temperatures scattering mechanism dominates and the whole range was explained by the universal percolation model. The colossal value of negative MR is found to be 88% at 168 K under an applied field strength of 2 T. As a result of our experimental data, we can grasp the intuitive understanding of magnetic as well as transport properties in Bi-doped manganite systems potential for magnetic sensors and spintronics applications.

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Section: Structural Propertiessupporting

confidence: 86%

Investigation of magnetic properties and colossal magnetoresistance in nanocrystalline doped manganite

Bisht,

Mahato

2023

J. Phys.: Condens. Matter

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“…It is the reciprocal of the square of the crystallite size as given by the equation 28 The Goldschmidt tolerance factor ( t ) can be used to estimate the crystal structure. It is given by the equation 9 where R A , R B and R O are the ionic radii of the A-site, B-site and oxygen, respectively. The tolerance factor for an ideal cubic perovskite structure is 1.…”

Section: Resultsmentioning

confidence: 99%

“…If the tolerance factor “ t ” lies between 1 > t > 0.9, the crystal is rhombohedral and a value t < 0.9 is orthorhombic in structure. 9 Any perovskite structure with a tolerance factor between 0.75 and 1 is considered to be stable. 10 Lanthanum-based perovskite oxides are such highly stable materials which usually exist as orthorhombic and rhombohedral structures.…”

Section: Introductionmentioning

confidence: 99%

Dielectric and electrochemical performance of rhombohedral lanthanum manganite perovskite nanostructures

et al. 2022

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“…Las manganitas son óxidos de manganeso con fórmula general AMnO 3 donde A puede ser un catión de tierra rara, un alcalino o un alcalinotérreo. Estos óxidos generalmente poseen una estructura tipo perovskita a la cual se le atribuyen sus interesantes y variadas propiedades por lo que pueden tener aplicaciones tales como transductores magnetorresistivos, sensores magnéticos, cátodos para celdas de combustible, dispositivos espintrónicos, fotocatalizadores y detectores infrarrojos entre otros (Afify et al, 2021).…”

Section: Introductionunclassified

Efecto del molibdeno sobre las propiedades eléctricas de la LaMnO3

Aguirre-Espinosa

Bolarín-Miró²,

Jesús³

et al. 2022

ICBI

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En este trabajo se realizó el estudio del efecto del dopaje con molibdeno (Mo) en la manganita de lantano, LaMnO3, con la finalidad de proponer posibles aplicaciones acorde a sus propiedades eléctricas, en un rango de composiciones desde 0.0 hasta 0.20 mol. de Mo6+ con ∆x=0.05. Las manganitas se obtuvieron a partir de óxidos metálicos de alta pureza mediante molienda de alta energía asistida con tratamiento térmico a 1100 °C. Los resultados obtenidos mediante DRX muestran la transformación de la fase romboédrica a cúbica de la LaMnO3 al dopar con 0.05 mol de Mo. Adicionalmente, se identificó la formación de La2Mo2O9 como fase secundaria. Por otro lado, se evaluó el efecto del dopaje sobre la conductividad eléctrica, la cual, disminuye con el aumento en la concentración del dopante. Así mismo, al incrementar la temperatura al analizar el comportamiento eléctrico en un rango de 25 °C hasta 500 °C, en todas las muestras la conductividad eléctrica aumenta, haciendo a estos materiales candidatos para termistores y cátodos celdas de óxido sólido.

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Room temperature ferromagnetism in Ag doped LaMnO3 nanoparticles

Cited by 26 publications

References 56 publications

Investigation of magnetic properties and colossal magnetoresistance in nanocrystalline doped manganite

Investigation of magnetic properties and colossal magnetoresistance in nanocrystalline doped manganite

Dielectric and electrochemical performance of rhombohedral lanthanum manganite perovskite nanostructures

Efecto del molibdeno sobre las propiedades eléctricas de la LaMnO3

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