Metal/Al2O3 Multilayers As High-Temperature X-Ray Mirrors

Abstract

By if-sputtering we have prepared high-quality metal/Al2O3 (metal: Co, Pt, W) artificial multilayers on sapphire (1120) substrates. We obtain interface roughnesses of about 0.2 nm and x-ray reflectivities of nearly 100 % at the first satellite reflection using Cu Kα radiation. The multilayer structures remain stable up to 700°C – 900°C without appreciable loss in reflectivity. Annealing causes structural changes depending on the chosen metal. Pt/Al2O3 forms a coherent superlattice structure whereas Co and W exhibit a gradual internal oxidation at the metal/Al2O3 interface. Beyond 900°C all systems are destroyed.

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Correspondence to CH. Morawe.

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Morawe, C., Zabel, H. Metal/Al2O3 Multilayers As High-Temperature X-Ray Mirrors. MRS Online Proceedings Library 382, 363 (1995). https://doi.org/10.1557/PROC-382-363

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