Local A-Site Layering in Rare-Earth Orthochromite Perovskites by Solution Synthesis

被引：16

作者：

Daniels, Luke M. ^{[1
]}

Kashtiban, Reza J. ^{[2
]}

Kepaptsoglou, Demie ^{[3
]}

Ramasse, Quentin M. ^{[3
]}

Sloan, Jeremy ^{[2
]}

Walton, Richard I. ^{[1
]}

机构：

[1] Univ Warwick, Dept Chem, Coventry CV4 7AL, W Midlands, England

[2] Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England

[3] SciTech Daresbury Campus, SuperSTEM Lab, Daresbury WA4 4AD, England

来源：

CHEMISTRY-A EUROPEAN JOURNAL | 2016年 / 22卷 / 51期

基金：

英国工程与自然科学研究理事会;

关键词：

chromites; electron energy loss spectroscopy (EELS); hydrothermal synthesis; magnetism; perovskites; HYDROTHERMAL SYNTHESIS; INTERCONNECT MATERIAL; POWDER DIFFRACTION; PHASE-TRANSITIONS; MULTIFERROICS; CHROMITES; OXIDES; POLARIZATION; MANGANITES;

D O I：

10.1002/chem.201604766

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Cation size effects were examined in the mixed A-site perovskites La0.5Sm0.5CrO3 and La0.5Tb0.5CrO3 prepared through both hydrothermal and solid-state methods. Atomically resolved electron energy loss spectroscopy (EELS) in the transmission electron microscope shows that while the La and Sm cations are randomly distributed, increased cation-radius variance in La0.5Tb0.5CrO3 results in regions of localised La and Tb layers, an atomic arrangement exclusive to the hydrothermally prepared material. Solid-state preparation gives lower homogeneity resulting in separate nanoscale regions rich in La3+ and Tb3+. The A-site layering in hydrothermal La0.5Tb0.5CrO3 is randomised upon annealing at high temperature, resulting in magnetic behaviour that is dependent on synthesis route.

引用

页码：18362 / 18367

页数：6

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