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In the end, it is shown that roughness can either increase or decrease the adhesive force at a rough interface depending on the degree of the roughness.
Similar as reported in literature for thermal loading, mechanical loading of a rough interface causes high stresses in interfacial roughness peaks and valleys.
A major failure mechanism in these types of coatings involves spallation of the top coat caused by the top/bond coat thermal expansion mismatch concomitant with deposition-induced top/bond coat interfacial roughness, oxide film growth and creep-induced normal stress reversal at the rough interface's peaks.
It is further noted that the TEM picture also shows a rough interface between La2O3 and W. The rough interface should be due to the oxidation of tungsten and the reaction between La2O3 and tungsten at the interface.
The rough interface of the sample with SL interlayer surely decreased polarization-induced net electron density in the quantum well.
Thus, we discussed that the high leakage currents were related to macroscopic defects and a rough interface [14].
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Figure 5 displays the generalised Kapitza resistances measured with MD for superlattices with rough interfaces having variable roughnesses.
Nevertheless, both models predict that a moderate amount of interfacial roughness will tend to decrease the in-plane TC, because rough interfaces will increase specular reflection and diffusive scattering of phonons travelling in the in plane direction.
Stimulated by a recent paper by Spaepen (Acta mater. 48 (2000) 31) we concentrate on the effect of roughness parameters on stress measurements in thin films for self-affine and mound rough interfaces.
Both methods give the same tendencies for the anisotropic heat transfer at superlattices with rough interfaces.
Substrates with randomly textured surface are commonly used to introduce rough interfaces into solar cells.
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