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Large magnetodielectric effect and negative magnetoresistance in NiO nanoparticles at room temperature

Nickel oxide nanoparticles having a mean particle size of 19.5 nm were synthesized by a simple chemical method. Those nanoparticles exhibited a spin glass like behaviour at a temperature around 9 K. The samples showed electronic conduction arising out of small polaron hopping between the Ni(2+) and...

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Detalles Bibliográficos
Autores principales: Chatterjee, Soumi, Maiti, Ramaprasad, Chakravorty, Dipankar
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9051572/
https://www.ncbi.nlm.nih.gov/pubmed/35493001
http://dx.doi.org/10.1039/d0ra00188k
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author Chatterjee, Soumi
Maiti, Ramaprasad
Chakravorty, Dipankar
author_facet Chatterjee, Soumi
Maiti, Ramaprasad
Chakravorty, Dipankar
author_sort Chatterjee, Soumi
collection PubMed
description Nickel oxide nanoparticles having a mean particle size of 19.5 nm were synthesized by a simple chemical method. Those nanoparticles exhibited a spin glass like behaviour at a temperature around 9 K. The samples showed electronic conduction arising out of small polaron hopping between the Ni(2+) and Ni(3+) species present in the material. A large magnetodielectric parameter with a maximum value of 52.2% was observed in the sample at room temperature which resulted from the Maxwell–Wagner polarization effect. This was explained as arising due to a large negative magnetoresistance caused by spin polarized electron hopping between Ni(2+) and Ni(3+) sites with the consequential formation of space charge polarization at the interfaces of the NiO nanoparticles. This was substantiated by direct measurement of magnetoresistance of the samples which gave identical results. It is believed that negative magnetoresistance after direct measurement occurred due to the interaction between ferromagnetic and antiferromagnetic phases and the value was 37%, the highest reported in the literature so far. As a result of the presence of Ni(3+) ions, antiferromagnetic phase and ferromagnetic like behaviour of NiO nanoparticles gave higher magnetization than other reported nanoparticles. Such large values of magnetoresistance of the samples will make the material useful as an ideal magnetic sensor.
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spelling pubmed-90515722022-04-29 Large magnetodielectric effect and negative magnetoresistance in NiO nanoparticles at room temperature Chatterjee, Soumi Maiti, Ramaprasad Chakravorty, Dipankar RSC Adv Chemistry Nickel oxide nanoparticles having a mean particle size of 19.5 nm were synthesized by a simple chemical method. Those nanoparticles exhibited a spin glass like behaviour at a temperature around 9 K. The samples showed electronic conduction arising out of small polaron hopping between the Ni(2+) and Ni(3+) species present in the material. A large magnetodielectric parameter with a maximum value of 52.2% was observed in the sample at room temperature which resulted from the Maxwell–Wagner polarization effect. This was explained as arising due to a large negative magnetoresistance caused by spin polarized electron hopping between Ni(2+) and Ni(3+) sites with the consequential formation of space charge polarization at the interfaces of the NiO nanoparticles. This was substantiated by direct measurement of magnetoresistance of the samples which gave identical results. It is believed that negative magnetoresistance after direct measurement occurred due to the interaction between ferromagnetic and antiferromagnetic phases and the value was 37%, the highest reported in the literature so far. As a result of the presence of Ni(3+) ions, antiferromagnetic phase and ferromagnetic like behaviour of NiO nanoparticles gave higher magnetization than other reported nanoparticles. Such large values of magnetoresistance of the samples will make the material useful as an ideal magnetic sensor. The Royal Society of Chemistry 2020-04-03 /pmc/articles/PMC9051572/ /pubmed/35493001 http://dx.doi.org/10.1039/d0ra00188k Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/
spellingShingle Chemistry
Chatterjee, Soumi
Maiti, Ramaprasad
Chakravorty, Dipankar
Large magnetodielectric effect and negative magnetoresistance in NiO nanoparticles at room temperature
title Large magnetodielectric effect and negative magnetoresistance in NiO nanoparticles at room temperature
title_full Large magnetodielectric effect and negative magnetoresistance in NiO nanoparticles at room temperature
title_fullStr Large magnetodielectric effect and negative magnetoresistance in NiO nanoparticles at room temperature
title_full_unstemmed Large magnetodielectric effect and negative magnetoresistance in NiO nanoparticles at room temperature
title_short Large magnetodielectric effect and negative magnetoresistance in NiO nanoparticles at room temperature
title_sort large magnetodielectric effect and negative magnetoresistance in nio nanoparticles at room temperature
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9051572/
https://www.ncbi.nlm.nih.gov/pubmed/35493001
http://dx.doi.org/10.1039/d0ra00188k
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