Diamagnetic anisotropy of sheetsilicates
Diamagnetic anisotropy of sheetsilicates
复制标题
片状硅酸盐的抗磁各向异性
DOI：
10.1007/bf00203105
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
M. Date
中科院分区：
文献类型：
--
作者：
C. Uyeda;T. Takeuchi;A. Yamagishi;A. Tsuchiyama;T. Yamanaka;M. Date
通过测量微米级晶体的磁取向，研究了片状硅酸盐的抗磁性能。对于平均直径为0.65μm、厚度为0.2μm的合成金云母，在低于35kOe的磁场下可以实现颗粒的取向。当实现对准时，板状单晶的平面被平行于场对齐。由于矿物晶体结构中的反磁各向异性引起的场致各向异性能超过外加电场中的热搅动能，从而实现了颗粒的取向。通过分析颗粒取向的场依赖关系，估算了片状硅酸盐矿物在没有提供大单晶的情况下每公式单位的抗磁各向异性Δχ。场致各向异性能与Δχ成正比，其中N是颗粒中的分子数。在所测片状硅酸盐中，Δχ值与F/OH摩尔比之间存在线性关系。这一关联支持了晶格中六方堆积的氧层导致片状硅酸盐各向异性的假设。
The diamagnetic properties of sheetsilicates are studied by measuring the magnetic orientation of micron-sized crystals. In the case of synthetic phlogopite with the average diameter of 0.65 μm and the thickness of 0.2 μm, the alignment of the grains is achieved in the magnetic field below 35 kOe. The planes of the platy single-crystal grains were alignned parallel to the field when the alignment was achieved. The alignment of the grains is realized because the field-induced anisotropic energy, caused by the diamagnetic anisotropy in the mineral's crystal structure, exceeds thermal agitation energy in the applied field. By analyzing the field dependence of grain alignment, the diamagnetic anisotropy per formula unit, Δχ, of sheetsilicate mineral is estimated even if a large single crystal is not provided. The field-induced anisotropic energy is proportional toNΔχwhereNis the number of molecules in the grain.A linear correlation has been found between the Δχvalue and the F/OH mole ratio among the measured sheetsilicates. This correlation supports the assumption that the hexagonally packed oxygen-layer in the crystal lattice induces the anisotropies of the sheetsilicates.