Ion-beam-sputtered Ta2O5/SiO2multi-layer stacks have been mechanically stressed to failure. The delamination failures do not occur precisely at the layer interfaces. XPS and AFM analyses indicate that the failures occur near the interfaces where SiO2was deposited on Ta2O5. Delamination is not observed near the interfaces where Ta2O5was deposited on SiO2. The failure location is 2-3 nm into Ta2O5layers and can occur randomly near multiple interfaces within a test. The delamination failures were induced by performing tape pull tests over lines scribed into the multi-layer coatings. © 2007 Elsevier B.V. All rights reserved.
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