Determination of exchange integrals and effect of cationic site occupancy (8b/24d) on the structural and magnetic properties of nanocrystalline Mn-doped Gd2O3

A. Karmakar; H. Arora; M. Nath; S. Sutradhar; B. J. Sarkar; G. Mandal; A. Samanta; A. Bandyopadhyay

doi:10.1016/j.jallcom.2022.167475

Determination of exchange integrals and effect of cationic site occupancy (8b/24d) on the structural and magnetic properties of nanocrystalline Mn-doped Gd₂O₃

A. Karmakar, H. Arora, M. Nath, S. Sutradhar, B. J. Sarkar, G. Mandal, A. Samanta, A. Bandyopadhyay

Research output: Contribution to journal › Article › peer-review

Abstract

Mn doped Gd_2(1‐x)Mn_2xO₃ (x = 0.03, 0.05) nanoparticles were prepared by simple co-precipitation method. The distribution of the cations in the six coordinated 8b and 24d sites were determined from Rietveld analysis. In addition, the cation-anion-cation bonds length which are responsible for the super-exchange interaction was extracted to describe the magnetic interaction in the samples. Transmission electron microscopy (TEM) and Raman spectroscopy were employed to investigate the microstructure and presence of any impurity (if any) phase of the samples. X-ray photoelectron spectroscopy (XPS) reveals the decrease in the number of Gd-O bonding and a corresponding increase in Mn-O bonding due to the successful replacement of Gd ions by Mn ions as the concentration increases. The first (nearest neighbor) and second exchange integral (next to nearest neighbor) were determined from molecular field model and the values confirm the occurrence of the antiferromagnetic interaction in the samples. The anomalies in the [Formula presented] vs. T data and non-linearity in M-H curve at 5 K were successfully interpreted by the cationic distribution in different local symmetry sites.

Original language	English
Article number	167475
Journal	Journal of Alloys and Compounds
Volume	931
DOIs	https://doi.org/10.1016/j.jallcom.2022.167475
State	Published - 10 Jan 2023
Externally published	Yes

Bibliographical note

Funding Information:
The authors thankfully acknowledge Professor B. Satpati, Saha Institute of Nuclear Physics, Kolkata for providing facilities for TEM measurements. One of the authors, Dr. A Bandyopadhyay, wants to dedicate this article in memory of his mother, Late Madhushri Banerjee, who always provided unending inspiration to contribute towards academic excellence.

Publisher Copyright:
© 2022 Elsevier B.V.

Keywords

Magnetization
Nanocrystallines
Rietveld analysis
Susceptibility, Exchange Integral

Access to Document

10.1016/j.jallcom.2022.167475

Cite this

Karmakar, A., Arora, H., Nath, M., Sutradhar, S., Sarkar, B. J., Mandal, G., Samanta, A., & Bandyopadhyay, A. (2023). Determination of exchange integrals and effect of cationic site occupancy (8b/24d) on the structural and magnetic properties of nanocrystalline Mn-doped Gd₂O₃. Journal of Alloys and Compounds, 931, [167475]. https://doi.org/10.1016/j.jallcom.2022.167475

@article{8aa4d17a17a14fa0891d63049de24711,

title = "Determination of exchange integrals and effect of cationic site occupancy (8b/24d) on the structural and magnetic properties of nanocrystalline Mn-doped Gd2O3",

abstract = "Mn doped Gd2(1‐x)Mn2xO3 (x = 0.03, 0.05) nanoparticles were prepared by simple co-precipitation method. The distribution of the cations in the six coordinated 8b and 24d sites were determined from Rietveld analysis. In addition, the cation-anion-cation bonds length which are responsible for the super-exchange interaction was extracted to describe the magnetic interaction in the samples. Transmission electron microscopy (TEM) and Raman spectroscopy were employed to investigate the microstructure and presence of any impurity (if any) phase of the samples. X-ray photoelectron spectroscopy (XPS) reveals the decrease in the number of Gd-O bonding and a corresponding increase in Mn-O bonding due to the successful replacement of Gd ions by Mn ions as the concentration increases. The first (nearest neighbor) and second exchange integral (next to nearest neighbor) were determined from molecular field model and the values confirm the occurrence of the antiferromagnetic interaction in the samples. The anomalies in the [Formula presented] vs. T data and non-linearity in M-H curve at 5 K were successfully interpreted by the cationic distribution in different local symmetry sites.",

keywords = "Magnetization, Nanocrystallines, Rietveld analysis, Susceptibility, Exchange Integral",

author = "A. Karmakar and H. Arora and M. Nath and S. Sutradhar and Sarkar, {B. J.} and G. Mandal and A. Samanta and A. Bandyopadhyay",

note = "Publisher Copyright: {\textcopyright} 2022 Elsevier B.V.",

year = "2023",

month = jan,

day = "10",

doi = "10.1016/j.jallcom.2022.167475",

language = "אנגלית",

volume = "931",

journal = "Journal of Alloys and Compounds",

issn = "0925-8388",

publisher = "Elsevier BV",

}

TY - JOUR

T1 - Determination of exchange integrals and effect of cationic site occupancy (8b/24d) on the structural and magnetic properties of nanocrystalline Mn-doped Gd2O3

AU - Karmakar, A.

AU - Arora, H.

AU - Nath, M.

AU - Sutradhar, S.

AU - Sarkar, B. J.

AU - Mandal, G.

AU - Samanta, A.

AU - Bandyopadhyay, A.

PY - 2023/1/10

Y1 - 2023/1/10

N2 - Mn doped Gd2(1‐x)Mn2xO3 (x = 0.03, 0.05) nanoparticles were prepared by simple co-precipitation method. The distribution of the cations in the six coordinated 8b and 24d sites were determined from Rietveld analysis. In addition, the cation-anion-cation bonds length which are responsible for the super-exchange interaction was extracted to describe the magnetic interaction in the samples. Transmission electron microscopy (TEM) and Raman spectroscopy were employed to investigate the microstructure and presence of any impurity (if any) phase of the samples. X-ray photoelectron spectroscopy (XPS) reveals the decrease in the number of Gd-O bonding and a corresponding increase in Mn-O bonding due to the successful replacement of Gd ions by Mn ions as the concentration increases. The first (nearest neighbor) and second exchange integral (next to nearest neighbor) were determined from molecular field model and the values confirm the occurrence of the antiferromagnetic interaction in the samples. The anomalies in the [Formula presented] vs. T data and non-linearity in M-H curve at 5 K were successfully interpreted by the cationic distribution in different local symmetry sites.

AB - Mn doped Gd2(1‐x)Mn2xO3 (x = 0.03, 0.05) nanoparticles were prepared by simple co-precipitation method. The distribution of the cations in the six coordinated 8b and 24d sites were determined from Rietveld analysis. In addition, the cation-anion-cation bonds length which are responsible for the super-exchange interaction was extracted to describe the magnetic interaction in the samples. Transmission electron microscopy (TEM) and Raman spectroscopy were employed to investigate the microstructure and presence of any impurity (if any) phase of the samples. X-ray photoelectron spectroscopy (XPS) reveals the decrease in the number of Gd-O bonding and a corresponding increase in Mn-O bonding due to the successful replacement of Gd ions by Mn ions as the concentration increases. The first (nearest neighbor) and second exchange integral (next to nearest neighbor) were determined from molecular field model and the values confirm the occurrence of the antiferromagnetic interaction in the samples. The anomalies in the [Formula presented] vs. T data and non-linearity in M-H curve at 5 K were successfully interpreted by the cationic distribution in different local symmetry sites.

KW - Magnetization

KW - Nanocrystallines

KW - Rietveld analysis

KW - Susceptibility, Exchange Integral

UR - http://www.scopus.com/inward/record.url?scp=85139836391&partnerID=8YFLogxK

U2 - 10.1016/j.jallcom.2022.167475

DO - 10.1016/j.jallcom.2022.167475

M3 - ???researchoutput.researchoutputtypes.contributiontojournal.article???

AN - SCOPUS:85139836391

SN - 0925-8388

VL - 931

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

M1 - 167475

ER -