Nanocrystalline YCrO3 with onion-like structure and unusual magnetic behaviour
Nanocrystalline YCrO3 with onion-like structure and unusual magnetic behaviour
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DOI：
10.1088/0957-4484/18/15/155706
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发表时间：
2007-03
期刊：
影响因子：
3.5
通讯作者：
V. Bedekar;R. Shukla;A. K. Tyagi
中科院分区：
文献类型：
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作者：
V. Bedekar;R. Shukla;A. K. Tyagi
以甘氨酸为燃料，金属硝酸盐为氧化剂，采用燃烧法合成了YCrO 3纳米粉体。三种不同的氧化剂-燃料比，即燃料不足，化学计量比和燃料过量的比例被选择来探索制备单相YCrO 3的可能性。发现在600 °C下煅烧后的相纯产物的微晶尺寸通过X射线线增宽为36 nm。通过光散射研究了团聚行为。TEM观察清楚地强调了YCrO 3明显的结晶度。一个惊人的观察是在HR-TEM显微照片中洋葱状层的存在。磁性测量揭示了弱铁磁性质的YCrO 3纳米颗粒，虽然散装YCrO 3据报道是一种反铁磁材料。
Nanocrystalline YCrO3 powder was synthesized by a combustion technique using glycine as the fuel and the corresponding metal nitrates as oxidants. Three different oxidant-to-fuel ratios namely fuel-deficient, stoichiometric and fuel-excess ratios were chosen to explore the possibility to prepare single-phasic YCrO3. The crystallite size for the phase pure product after calcination at 600 °C was found to be 36 nm by x-ray line broadening. The agglomerate behaviour was investigated by light scattering studies. The TEM observations clearly highlight the pronounced crystallinity for YCrO3. A striking observation was the presence of onion-like layers in HR-TEM micrographs. Magnetic measurements reveal the weak ferromagnetic nature of YCrO3 nanoparticles, although the bulk YCrO3 is reported to be an antiferromagnetic material.