Zero Diffraction Plate with Cavity for XRD: 30 Dia x1.0 t mm w/ Cavity 20mm IDx0.5 mm, Si Crystal-Crystal: Si, P-type B-dopedResistivity:10-15 ohm.cmSize: 30 mm diameter x 1.0 mm Thickness,with a cavity in the center of the plate with 20mm dia. and 0.5 mm depth Zero diffraction plate is made of Silicon cut at special orientationPerfect for sample holder of powder XRD, which has no background noise from 20 to 120 degree (2θ angle Cu Ka X-Ray)