View of an instrument Crystal Monochromator Detector X-Ray Tube 6
6 View of an instrument
The Bragg-Brentano Geometry Mono- chromator Divergence slit Antiscatter- slit Detector- Tube slit Sample
7
Crystal Monochromator X-ray beam monochromatization can be achieved by diffraction from single crystals:Si,Ge,LiCl,and graphite. 2d sin0 =A Monochromator Slit Polychromatic Divergence Beam slit Monochromatic Beam Longer wavelengths Shorter Wavelengths 8 92 01 Monochromator Sufficient to separate Ka and KB .Not sufficient to separate Ka and Ko 8
8
Powder Pattern Cell Structure Sample Instrument LLLLLL Unit Cell 20 6 Atomic Structure 20 + Sample Instrument .20 Powder Pattern .20
9
La(NiasSn1s),Cu Ko 多 20 Diffractometers 1.5 8 113.Ka 1.0 032,Ka1 131,Ka 113.Ka 131,K 0.5 032.Ka Powder Diffractometer 鼍 10 0.0 80 83 84 0 30 40 60 60 708090100110120 Bragg angle,20(deg.) CAUTIO网 V.K.Pecharsky and P.Y.Zavalij Fundamentals of Powder Diffraction and Structural Characterization of Materials:
10