Magnetic Relaxation of Superparamagnetic Fe Oxide Particles Studied With Mössbauer Spectroscopy

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2023-04-03 DOI:10.1109/LMAG.2023.3264115

Eiji Kita;Reisho Onodera;Mikio Kishimoto;Hideto Yanagihara

引用次数: 0

Abstract

A Mössbauer spectroscopy (MS) study was performed on the superparamagnetic commercially available magnetic fluid, Resovist, with temperatures varying between room temperature and 2.6 K. Two samples were prepared for MS study, one dried specimen and the other frozen. At the lowest temperature of 2.6 K, the spectrum was characteristic of maghemite, and superparamagnetic relaxation was observed with increasing temperature. On the spectrum recorded at 250 K, fitting was performed using the three components in the Blume–Tjon two-state magnetic relaxation model, which resulted in relaxation times of

$3.8 \times 10^{-8}$

$1.7 \times 10^{-8}$

, and

$6.4 \times 10^{-10}$

s for the three components.

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用穆斯堡尔谱研究超顺磁性氧化铁粒子的磁弛豫

对超顺磁性市售磁性流体Resovist进行了穆斯堡尔谱（MS）研究，温度在室温和2.6 K之间变化。制备了两个用于MS研究的样品，一个干燥样品，另一个冷冻样品。在2.6K的最低温度下，光谱具有磁赤铁矿的特征，并且随着温度的升高，观察到超顺磁弛豫。在250K下记录的光谱上，使用Blume–Tjon两态磁弛豫模型中的三个分量进行拟合，这导致三个分量的弛豫时间分别为$3.8\乘以10^{-8}$、$1.7\乘以10^｛-8}$和$6.4\乘以10^2｛-10}$。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.