Structure, Surface Composition and Magnetic Properties of Mechanosynthesized Lafeo3 Nanoparticles and Their Eu3+-Doped and Eu3+/Cr3+-Co-Doped Modifications

24 Pages Posted: 14 Dec 2023

See all articles by R. T. Al-Mamari

R. T. Al-Mamari

Sultan Qaboos University

Hisham Widatallah

Sultan Qaboos University

M. E. Elzain

Sultan Qaboos University

Abbasher Gismelseed

Sultan Qaboos University

Ahmad Al-Rawas

Sultan Qaboos University

S. H. Al-Harthi

Sultan Qaboos University

M. T. Z. Myint

Sultan Qaboos University

N. Al Saqri

Sultan Qaboos University

Mohammed Al-Abri

Sultan Qaboos University

Abstract

The structure, surface composition and magnetism of mechanosynthesized LaFeO3 nanoparticles (30-40 nm), and their Eu3+-doped (La0.70Eu0.30FeO3) and Eu3+/Cr3+ co-doped (La0.70Eu0.30Fe0.95Cr0.05O3) modifications are reported. Doping results in a transition from the O՝-type to the O-type distorted structure. Traces of reactants, intermediate phases and a tiny amount of Eu2+-ions are detected on the nanoparticles' surfaces. The nanoparticles consist of antiferromagnetic cores flanked by ferromagnetic-like 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 behaviour associated with the minority Eu2+ ions. An 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 nanoparticles’ cores, are observed.

Keywords: Orthoferrites, XRD: Mössbauer spectroscopy, XPS, van-Vleck paramagnetism

Suggested Citation

Al-Mamari, R. T. and Widatallah, Hisham and Elzain, M. E. and Gismelseed, Abbasher and Al-Rawas, Ahmad and Al-Harthi, S. H. and Myint, M. T. Z. and Al Saqri, N. and Al-Abri, Mohammed, Structure, Surface Composition and Magnetic Properties of Mechanosynthesized Lafeo3 Nanoparticles and Their Eu3+-Doped and Eu3+/Cr3+-Co-Doped Modifications. Available at SSRN: https://ssrn.com/abstract=4664462 or http://dx.doi.org/10.2139/ssrn.4664462

R. T. Al-Mamari

Sultan Qaboos University ( email )

Hisham Widatallah (Contact Author)

Sultan Qaboos University ( email )

PO Box 20
Al-khod SQU 123
Muscat
Oman

M. E. Elzain

Sultan Qaboos University ( email )

Abbasher Gismelseed

Sultan Qaboos University ( email )

PO Box 20
Al-khod SQU 123
Muscat
Oman

Ahmad Al-Rawas

Sultan Qaboos University ( email )

PO Box 20
Al-khod SQU 123
Muscat
Oman

S. H. Al-Harthi

Sultan Qaboos University ( email )

M. T. Z. Myint

Sultan Qaboos University ( email )

N. Al Saqri

Sultan Qaboos University ( email )

PO Box 20
Al-khod SQU 123
Muscat
Oman

Mohammed Al-Abri

Sultan Qaboos University ( email )

PO Box 20
Al-khod SQU 123
Muscat
Oman

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