共查询到10条相似文献,搜索用时 62 毫秒
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应用简单的电镀槽,通过阴极/电解液界面前沿气泡鞘的形成而建立辉光放电,促成非晶态碳薄膜在电极表面的沉积。沉积物宏观上分布不均匀,在阴极浸入电解液的末端,由于电流的尖端效应,导致生成物为石墨。而远离末端为正常沉积区,表面平整光滑,生成物为非。晶态碳膜。结论:液相等离子沉积行为可发生在辉光放电条件下的阴极过程,从而可应用于非晶态薄膜如非晶态碳的制备。 相似文献
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退火温度对Nd2Fel4B/α—Fe磁性多层膜中相形成的影响 总被引:2,自引:0,他引:2
通过TEM和HRTEM对比研究了软磁层厚度为2.5nm的Nd2Fe14B/α—Fe型多层膜的显微结构.结果表明,在退火前的多层膜中Fe层为多晶,硬磁相以非晶的状态存在;在600℃以上退火后软磁层消失,生成的Nd2Fe14B型相被固定在硬磁层内;625℃退火后发现有Nd2Fe17相在硬磁层中析出,表明在多层膜退火过程中,退火温度对相转变的影响比退火时间的影响更大.Nd2Fe17相的析出可能是高温退火后磁性能下降的主要原因. 相似文献
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Steve Weiner Julia Mahamid Yael Politi Yurong Ma Lia Addadi 《Frontiers of Materials Science in China》2009,3(2):104-108
It was assumed for a long time that organisms produce minerals directly from a saturated solution. A few exceptions were known,
including the well documented mineralized teeth of the chiton. In 1997 it was demon-strated that sea urchin larvae form their
calcitic spicules by first depositing a highly unstable mineral phase called amorphous calcium carbonate. This strategy has
since been shown to be used by animals from other phyla and for both aragonite and calcite. Recent evidence shows that vertebrate
bone mineral may also be formed via a precursor phase of amorphous calcium carbonate. This strategy thus appears to be widespread.
The challenge now is to understand the mechanisms by which these unstable phases are initially formed, how they are temporarily
stabilized and how they are destabilized and transform into a crystalline mature product. 相似文献
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研究了含Co的Finemet型(Fe..5Co0.5)73.5Nb3Si13.5B9Cu1和(Fe0.5Co0.5)73.5Nb2V1Si13.5B9Cu1合金在不同温度纳米晶化后的磁性.结果表明,用V部分替代Nb对淬态(Fe0.5Co0.5)73.5Nb2V1Si13.5B9Cu1非晶合金的居里温度没有明显的影响,但是形成(Fe0.5Co0.5)7a.5Nb2V1Si13.589Cu1纳米晶合金使剩余非晶中Co的含量降低,导致初始磁导率在高温下快速衰减;用V部分替代Nb使(Fe0.5Co0.5)73.5Nb2ViSi13.5B9Cu1纳米晶合金中的晶体相含有更多的Co,增大了材料的饱和磁感应强度B8并显著提高了初始磁导率. 相似文献
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本文综述了后处理及原位生长BiCrCuO高潮温超导薄膜的主要进展,重点讨论了影响110K相生长速率的工艺因素及提高Bi系高温超导薄膜质量的可能方法。 相似文献
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本文采用HWA-MWECR-CVD系统制备了微晶硅薄膜。研究了氢稀释比、反应压强以及微波功率对微晶硅薄膜非晶转微晶相变及其相关性能的影响。实验结果表明:当氢稀释比为94%、反应压强为1.5Pa以及微波功率为500W时,高质量的微晶硅薄膜可以被获得,如2.86*104的高光敏性,1nm左右的沉积速率以及8.9%的光致衰退速率等。 相似文献
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Z. C. Su V. B. C. Tan T. E. Tay 《International journal for numerical methods in engineering》2012,92(13):1081-1099
A general three‐dimensional concurrent multiscale modeling approach is developed for amorphous materials. The material is first constructed as a tessellation of hexahedral amorphous cells. For regions of linear deformation, the number of degrees of freedom is reduced by computing the displacements of the vertices of the amorphous cells only instead of the atoms within. This is achieved by determining, a priori, the atom displacements within such pseudoamorphous cells associated with orthogonal deformation modes of the cell. Actual atom displacements are calculated using traditional molecular mechanics for regions of nonlinear deformation. Computational implementation of the coupling between pseudoamorphous cells and molecular mechanics regions and stiffness matrix formulation are elucidated. Multiscale simulations of nanoindentation on polymer and crystalline substrates show good agreement with pure molecular mechanics simulations. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
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非晶软磁合金的巨磁阻抗效应及应用 总被引:3,自引:2,他引:1
近来在FeCoSiB等Co基非晶体丝带中现了巨磁阻抗效应,由于在一小的直流纵向偏置场下该效应能使丝带两端的交流电压发生大而灵敏的变化,因而在磁记录头和传顺技术中具有巨大的应用科学潜能,受到各国学者的关注,本文简单介绍了巨磁阻抗效应的来源,并综述了近年来非晶体软磁合金材料的的巨磁阻抗效应及应用的研究进展,文章最后说明了尚待深入解决的问题。 相似文献