用X射线方法研究Ni/C多层膜的热稳定性。

Investigation of the thermal stability of Ni/C multilayers by X-ray methods.

作者信息

Krawietz R, Wehner B, Meyer D, Richter K, Mai H, Dietsch R, Hopfe S, Scholz R, Pompe W

机构信息

TU Dresden, Institut für Kristallographie und Festkörperphysik, Mommsenstrasse 13, D-01069, Dresden, Germany.

出版信息

Anal Bioanal Chem. 1995 Oct;353(3-4):246-50. doi: 10.1007/s0021653530246.

DOI:10.1007/s0021653530246

PMID:15048475

Abstract

Microstructural properties of Ni/C multilayers prepared by PLD (pulsed laser deposition) have been investigated after heat treatment in vacuum at temperatures in the range of 50 degrees C to 500 degrees C. X-ray diffractometry, X-ray reflectometry, fluorescence EXAFS (extended X-ray absorption fine structure) and HREM (high resolution transmission electron microscopy) have been applied to characterize samples in the initial state and after annealing. The multilayer reflectivity remained unchanged or increased at temperatures below 400 degrees C due to sharpening of the interfaces caused by the formation of alpha-nickel and nickel carbide. The reflectivity decreased at temperatures above 400 degrees C because of the fragmentation of the nickel layers. It can be shown, that both chemical and mechanical driving forces are responsible for the observed modifications of the initial specimen state.

摘要

通过脉冲激光沉积（PLD）制备的Ni/C多层膜在50℃至500℃范围内的真空中进行热处理后，对其微观结构特性进行了研究。已应用X射线衍射、X射线反射、荧光扩展X射线吸收精细结构（EXAFS）和高分辨率透射电子显微镜（HREM）来表征初始状态和退火后的样品。由于α-镍和碳化镍的形成导致界面锐化，多层膜反射率在400℃以下保持不变或增加。在400℃以上，由于镍层的破碎，反射率下降。可以表明，化学和机械驱动力都是导致初始试样状态发生观察到的变化的原因。