Structural Characterization and Physical Properties of Double Perovskite La2FeReO6+δ Powders

被引：14

作者：

Tang, Qingkai ^{[1
]}

Zhu, Xinhua ^{[1
]}

机构：

[1] Nanjing Univ, Sch Phys, Natl Lab Solid State Microstruct, Nanjing 210093, Peoples R China

来源：

NANOMATERIALS | 2022年 / 12卷 / 02期

基金：

中国国家自然科学基金;

关键词：

double perovskite La2FeReO6+delta powders; solid-state reaction; dielectric properties; magnetic properties; optical properties; structural characterization; FERRIMAGNETIC DOUBLE PEROVSKITES; FERROMAGNETIC SEMICONDUCTOR; MAGNETIC-PROPERTIES; CRYSTAL-STRUCTURE; ROOM-TEMPERATURE; MAGNETORESISTANCE; SPINTRONICS; FILMS; TRANSITION; CATALYST;

D O I：

10.3390/nano12020244

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The structural, optical, dielectric, and magnetic properties of double perovskite La2FeReO6+delta (LFRO) powders synthesized by solid-state reaction method under CO reduced atmosphere are reported on in this paper. Reitveld refinements on the XRD data revealed that the LFRO powders crystallized in an orthogonal structure (Pbnm space group) with column-like morphology. The molar ratios of La, Fe, and Re elements were close to 2:1:1. XPS spectra verified the mixed chemical states of Fe and Re ions, and two oxygen species in the LFRO powders. The LFRO ceramics exhibited a relaxor-like dielectric behavior, and the associated activation energy was 0.05 eV. Possible origins of the dielectric relaxation behavior are discussed based on the hopping of electrons among the hetero-valence ions at B-site, oxygen ion hopping through the vacant oxygen sites, and the jumping of electrons trapped in the shallower level created by oxygen vacancy. The LFRO powders display room temperature ferromagnetism with Curie temperature of 746 K. A Griffiths-like phase was observed in the LFRO powders with a Griffiths temperature of 758 K. The direct optical band gap of the LFRO powders was 2.30 eV, deduced from their absorption spectra, as confirmed by their green photoluminescence spectra with a strong peak around 556 nm.

引用

页数：16

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