Download Design and Construction of an X- ray Diffractometer Margaret Kirkland

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Transcript 
Design and
Construction of an Xray Diffractometer
Margaret Kirkland
Brandon Hoffman
Outline
2π‘‘π‘ π‘–π‘›πœƒ = π‘›πœ†
Motivation
XRD
Structure of Thin Films
Sideview of Crystal Planes
d
(110)
d
(100)
Wave Interference
Constructive:
Destructive:
Bragg’s Law
πœƒ
2π‘‘π‘ π‘–π‘›πœƒ = π‘›πœ†
Apparatus
πœƒ
2πœƒ
πœƒ
X-Ray Circuit
Target
Filament
Variable
Resistor
12V
40kV
Bremsstrahlung X-rays
Incident 𝑒 βˆ’
X-ray
Incident 𝑒 βˆ’
Characteristic X-rays
Incident 𝑒 βˆ’
Incident 𝑒 βˆ’
X-ray
ejected 𝑒 βˆ’
X-ray
Characteristic
X-rays
Intensity
Bremsstrahlung
Continuum
Wavelength (nm)
XRD – Top view
πœƒ
Sample
mount
2πœƒ
X-ray
source
πœƒ
Detector
Motors
XRD – Side view
Sample
Sample arm
Detector arm
O-ring
Motor
Semicircle
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