Ziolo R F, Giannelis E P, Weinstein B A, O'horo M P, Ganguly B N, Mehrotra V, Russell M W, Huffman D R
Science. 1992 Jul 10;257(5067):219-23. doi: 10.1126/science.257.5067.219.
A new magnetic material with appreciable optical transmission in the visible region at room temperature has been isolated as a gamma-Fe(2)O(3)/polymer nanocomposite. The synthesis is carried out in an ion-exchange resin at 60 degrees C. Magnetization and susceptibility data demonstrate loading-dependent saturation moments as high as 46 electromagnetic units per gram and superparamagnetism for lower loadings where particle sizes are less than 100 angstroms. Optical absorption studies show that the small-particle form of gamma-Fe(2)O(3) is considerably more transparent to visible light than the single-crystal form. The difference in absorption ranges from nearly an order of magnitude in the "red" spectral region to a factor of 3 at 5400 angstroms. The magnetization of the nanocomposite is greater by more than an order of magnitude than those of the strongest room-temperature transparent magnets, FeBO(3) and FeF(3).
一种在室温下可见光区域具有可观光透射率的新型磁性材料已被分离出来，它是一种γ-Fe₂O₃/聚合物纳米复合材料。合成过程在离子交换树脂中于60℃下进行。磁化强度和磁化率数据表明，负载依赖性饱和磁矩高达每克46电磁单位，对于粒径小于100埃的较低负载情况呈现超顺磁性。光吸收研究表明，γ-Fe₂O₃的小颗粒形式对可见光的透明度比单晶形式高得多。吸收差异在“红色”光谱区域从近一个数量级到5400埃处的3倍不等。该纳米复合材料的磁化强度比最强的室温透明磁体FeBO₃和FeF₃的磁化强度大一个多数量级。
