Magnetic Properties and Mossbauer Study of Perovskite LaFeO3 and LaFe0.5Cr0.5O3

被引：10

作者：

Xia, Puyue ^{[1
]}

Mo, Jiajun ^{[1
]}

Chen, Jiangbin ^{[2
]}

Liu, Min ^{[1
]}

Xia, Yanfang ^{[1
]}

机构：

[1] Univ South China, Coll Nucl Sci & Technol, Hengyang 421001, Peoples R China

[2] Univ South China, Sch Comp Sci, Hengyang 421001, Peoples R China

来源：

PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS | 2022年 / 16卷 / 06期

基金：

中国国家自然科学基金;

关键词：

Cr-doped LaFeO3; magnetic properties; Monte Carlo simulations; Mossbauer spectroscopy; MONTE-CARLO SIMULATIONS; AB-INITIO CALCULATIONS; NEUTRON-DIFFRACTION; CR; SUBSTITUTION;

D O I：

10.1002/pssr.202200023

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Herein, a citric acid combustion method is used to prepare LaFeO3 (LFO) and LaFe0.5Cr0.5O3 (LFCO). Stable and distorted perovskite structures are detected by X-ray diffraction (XRD) patterns of both samples. Due to the substitution of chromium ions, Fe-Fe couplings are wholly disrupted, thus indicating the transition from a sextet to a singlet at room temperature. The M versus T curve of LFO exhibits two anomalous peaks related to Fe-O-Fe superexchange interactions. However, a quite different behavior is observed in LFCO. It reveals the negative irreversibility below 239 K and becomes paramagnetic above 269 K. The field-cooled (FC) curve of LFCO is also simulated using the Monte Carlo method with Heisenberg model. Exchange coupling and anisotropy constants, which indicate some system properties, are calculated by applying the particle swarm algorithm fitting. The Neel temperature of LFCO is determined to be 80 K.

引用

页数：6

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