材料科学
正铁氧体
钙钛矿(结构)
纳米颗粒
等结构
透射电子显微镜
纳米晶
磁化
光谱学
傅里叶变换红外光谱
表征(材料科学)
钆
相(物质)
分析化学(期刊)
化学工程
核磁共振
结晶学
纳米技术
晶体结构
有机化学
化学
磁场
量子力学
冶金
工程类
物理
作者
Fredrik Söderlind,Marc A Fortin,Rodrigo Petoral,Anna Klasson,Teodor Veres,Maria Engström,Kajsa Uvdal,Per‐Olov Käll
出处
期刊:Nanotechnology
[IOP Publishing]
日期:2008-02-01
卷期号:19 (8): 085608-085608
被引量:37
标识
DOI:10.1088/0957-4484/19/8/085608
摘要
Synthesis of very small (about 4 nm) perovskite structured gadolinium orthoferrite nanoparticles (GdFeO3) was performed by the polyol method. The material shows promising relaxivity properties and potential as a contrast agent in magnetic resonance imaging. The perovskite nanoparticles were characterized by x-ray diffraction, transmission electron microscopy, energy dispersive x-ray spectroscopy, Fourier transform infrared spectroscopy, magnetic resonance, and magnetization measurements. Upon heating in air at 800 °C for 3 h the size of the crystals increased to about 40 nm. The crystalline structure of the heat treated compound is in good agreement with perovskite GdFeO3 as the primary product. Contributions from various secondary phases were also identified, including one hitherto unknown phase with the suggested composition 'Gd3FeO6' and isostructural with Gd3GaO6. The novel 'Gd3FeO6' phase appears to be kinetically stabilized in the nano state.
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