DuraBeryllium® X-ray Windows
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DuraBeryllium® X-ray Windows X-ray Windows Datasheet Moxtek® DuraBeryllium® windows are the highest performing beryllium x-ray windows available. DuraBeryllium windows have high x-ray transmission, are corrosion resistant, and vacuum tight. DuraBeryllium windows can be attached with a high temperature metal diffusion bond or using a vacuum compatible epoxy. DuraBeryllium windows are used in a variety of applications including microanalysis, EDXRF, WDXRF, and XRD. Features Mounted DuraBeryllium X-ray Windows Applications ■■ Microanalysis ■■ EDXRF ■■ WDXRF ■■ XRD Standard Window Sizes Standard window sizes available are shown in the following table: Thickness (µm) Diameter (mm) 8.0 4.9 8.0 5.7 8.0 7.9 8.0 9.2 8.0 12.0 12.5 12.0 12.5 16.0 25.0 9.2 25.0 16.0 Other window sizes are available but may require a longer lead time. Refer to Table 2 for more options. Benefits DuraCoat® DuraCoat® Plus Thin Beryllium Uniform thickness Epoxy adhesive (optional) Metal diffusion bond (optional) High purity Corrosion resistance, hermetic seal Maximum corrosion resistance High transmission of low energy x-rays Constant transmission across entire window Reduced cost High temperature exposure Minimal spectral contamination DuraCoat Coatings DuraCoat and DuraCoat Plus are proprietary films that are added to beryllium to protect against potential vacuum leaks and exposure to various corrosive materials. DuraCoat is applied to both sides of a beryllium foil while DuraCoat Plus is only applied to one side. DuraCoat is available in both epoxy and metal diffusion bonded parts, while DuraCoat Plus is only available in metal diffusion bonded parts. Window Composition DuraBeryllium windows have a proprietary inorganic DuraCoat® film which provides a hermetic seal and chemical resistance. DuraCoat refractory low-Z material is resistant to atmospheric moisture and chemicals. DuraBeryllium Plus windows have an additional DuraCoat Plus polymer film that provides maximum chemical and humidity protection with minimal impact to X-ray transmission. Uncoated beryllium windows are also available from Moxtek. Mechanical Strength DuraBeryllium has the same mechanical strength as uncoated beryllium. Window Bonding Temperature Performance Differences Metal diffusion bonded windows can withstand temperatures up to 400°C in vacuum or 350°C in air. Epoxy bonded windows can be exposed to temperatures up to 110 °C at a differential pressure of 1 atm on approved mount designs. Cleanability MOXTEK ® DuraBeryllium windows can be cleaned with high purity solvents (methanol, isopropanol, or ethanol are recommended). See Guidelines for Cleaning AP3 and DuraBeryllium X-ray Windows (WIN-TECH-1003). Please contact Moxtek professionals for further cleaning instruction. WIN-DATA-1003, REV C Subject to technical change without notice 1

Beryllium Characteristics Hardness: 2000 Vickers Electrical Resistivity: <4x104 ohm-cm Table 1 Chemical Compatibility of DuraBeryllium Window Etching Reagents+ Nominal pH DuraBeryllium windows are resistant to many solvents, acids, bases, and moisture while non-coated beryllium windows are not. Etching Rates (nm/min @25˚ C) HF 0.80 Negligible H2SO4 1.38 Negligible HNO3 1.17 1.09 Acetic Acid 1.80 Negligible H3PO4 1.17 0.146 1.00 0.14 NH4OH+H2O2 Aqua Regia 11.40 Negligible NaOH Solution* 13.70 Negligible Ferricyanide** 13.70 165 Permanganate# 13.70 900 ++ + All solutions are concentrated...

Figure 1 DuraBeryllium X-ray Transmission X-ray transmission of DuraBeryllium is slightly lower than bare beryllium. Beryllium and DuraBeryllium Transmission Transmission 8 µm Beryllium 8 µm DuraBeryllium® 8 µm DuraBeryllium® Plus 25 µm Beryllium 25 µm DuraBeryllium® 25 µm DuraBerylliumPlus® 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0 500 1000 1500 Energy (eV) 2000 2500 3000 Mounting Two options are available for mounting DuraBeryllium foils: vacuum compatible epoxy adhesive or metal diffusion bonding. Atmosphere Side Mount Window Adhesive Bond Figure 1 Epoxy Adhesive Attachment of Beryllium...