Hausmannite Mn3O4 nanorods:: synthesis, characterization and magnetic properties
Hausmannite Mn3O4 nanorods:: synthesis, characterization and magnetic properties
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DOI：
10.1088/0957-4484/17/19/024
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发表时间：
2006-10-14
期刊：
影响因子：
3.5
通讯作者：
Qian, Yitai
中科院分区：
文献类型：
--
作者：
Du, Jin;Gao, Yongqian;Qian, Yitai
以聚乙二醇（PEG-20000）和高锰酸钾（KMnO_4）为原料，水热法制备了前驱体（Mn_3 O_4 + MnOOH），在180 ℃下真空煅烧20 h，得到了直径约为100 nm，长度达15-20 μ m的高产量黑锰矿（Mn_3 O_4）纳米棒。透射电子显微镜和选区电子衍射图显示，这些Mn 3 O 4纳米棒显示出沿着[100]方向的单晶生长。PEG-20000和煅烧条件对产物的形貌和相纯度有关键影响。磁性测量结果表明，这些Mn 3 O 4纳米棒的阻断温度为41 K，这与块体材料的值相一致，而剩余磁化强度和矫顽力分别为0.89 mu（B）和6177 Oe。
High yield hausmannite (Mn3O4) nanorods with diameters of about 100 nm and lengths up to 15-20 mu m have been prepared by vacuum calcining of the precursor (Mn3O4 + MnOOH), which was hydrothermally prepared by the reaction of PEG-20000 and KMnO4 at 180 degrees C for 20 h. Transmission electron microscopy and the selected-area electron diffraction pattern reveal that these Mn3O4 nanorods show single-crystal growth along the [100] direction. The PEG-20000 and the calcination conditions have key effects on the morphology and phase purity of the product. Magnetism measurements show that the blocking temperature for these Mn3O4 nanorods is 41 K, which agrees with the bulk material value, whereas the remnant magnetization and coercivity are 0.89 mu(B) and 6177 Oe respectively.