Formation and superparamagnetic behaviors of LaFeO_3 nanoparticles
Formation and superparamagnetic behaviors of LaFeO_3 nanoparticles
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LaFeO_3纳米粒子的形成及超顺磁性行为
DOI：
10.1007/s10751-011-0423-4
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发表时间：
2012
影响因子：
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通讯作者：
Tatsuo Fujii
中科院分区：
文献类型：
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作者：
T.Kinoshita;T.Obata;T.Nagashima;H.Yanagi;J.Xie;R.Collazo;S.Inoue;Y.Kumagai;A.Koukitu and Z.Sitar;Tatsuo Fujii
研究了热处理温度对有机金属前驱体热分解生成LaFeO3纳米粒子的影响。在300°C以下热处理的前驱体是非晶态的，但在350°C以上形成了单相的纳米晶LaFeO3。LaFeO3纳米粒子在磁化强度和穆斯堡尔谱中都表现出超顺磁性。随着热处理温度的升高，LaFeO3纳米颗粒的晶粒尺寸逐渐增大。LaFeO3颗粒的生长对顺磁偶极图的四极分裂和同质异能素位移有影响。
Formation of LaFeO3nanoparticles obtained from thermal decomposition of organometallic precursors was investigated as a function of the heat-treatment temperature. The precursors heat-treated below 300°C were amorphous, but above 350°C a single-phase of nanocrystalline LaFeO3was formed. The LaFeO3nanoparticles showed the superparamagnetic behavior in both magnetization and Mössbauer measurements. With increasing heat-treatment temperature, the crystallite size of LaFeO3nanoparticles was gradually increased. The quadrupole splitting and isomer shift of paramagnetic doublet pattern were affected by the growth of LaFeO3particles.