Internal Structure and Temporal Stability of Hard X-ray Pd/B4C Multilayer Mirrors under Different Humidity Environments

Pd/B4C multilayers with 2.5 nm of d-spacing and thick Si and B4C capping layers were fabricated to study temporal stability under storage in different environments with relative humidity of 10% and 50%. The two stored samples were investigated using grazing incidence X-ray reflectometry (GIXR), X-ra...

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Veröffentlicht in:Coatings (Basel) 2021-03, Vol.11 (3), p.262
Hauptverfasser: Liu, Genchang, Huang, Qiushi, Qi, Runze, Ni, Hangjian, Feng, Yufei, Zhang, Zhong, Wang, Zhanshan
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container_issue 3
container_start_page 262
container_title Coatings (Basel)
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creator Liu, Genchang
Huang, Qiushi
Qi, Runze
Ni, Hangjian
Feng, Yufei
Zhang, Zhong
Wang, Zhanshan
description Pd/B4C multilayers with 2.5 nm of d-spacing and thick Si and B4C capping layers were fabricated to study temporal stability under storage in different environments with relative humidity of 10% and 50%. The two stored samples were investigated using grazing incidence X-ray reflectometry (GIXR), X-ray scattering (XRS), an optical microscope, transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The GIXR results showed that the reflectivity of the samples under 10% humidity and 50% humidity dropped by 3% and 8%, respectively, after 13 months. The optical microscope showed that the surface of the 10% humidity sample was smooth and undamaged, whereas the surface of the 50% humidity sample significantly eroded. TEM showed that the internal multilayer structure of the sample stored in 10% humidity was well protected by the capping layers. For the sample stored in 50% humidity, a major part of the Si and B4C capping layers were wrinkled and delaminated, and some surface layers of the multilayer structure were degraded with severe diffusion of boron. The XPS results showed a relatively large amount of oxygen in the B4C capping layer of the 50% humidity sample, and an obvious oxidation of the boron was found in the B4C capping layer and the surface of the multilayer. The severe oxidation and diffusion of boron and the delamination of the capping layers caused the degradation of the Pd/B4C multilayers stored in 50% humidity.
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The two stored samples were investigated using grazing incidence X-ray reflectometry (GIXR), X-ray scattering (XRS), an optical microscope, transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The GIXR results showed that the reflectivity of the samples under 10% humidity and 50% humidity dropped by 3% and 8%, respectively, after 13 months. The optical microscope showed that the surface of the 10% humidity sample was smooth and undamaged, whereas the surface of the 50% humidity sample significantly eroded. TEM showed that the internal multilayer structure of the sample stored in 10% humidity was well protected by the capping layers. For the sample stored in 50% humidity, a major part of the Si and B4C capping layers were wrinkled and delaminated, and some surface layers of the multilayer structure were degraded with severe diffusion of boron. The XPS results showed a relatively large amount of oxygen in the B4C capping layer of the 50% humidity sample, and an obvious oxidation of the boron was found in the B4C capping layer and the surface of the multilayer. 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title Internal Structure and Temporal Stability of Hard X-ray Pd/B4C Multilayer Mirrors under Different Humidity Environments
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