{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Lecture24-XRD-PreciseLatticeParameterMeasurements

Lecture24-XRD-PreciseLatticeParameterMeasurements - EMSE...

Info icon This preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
EMSE 312 – Diffraction Principles Lecture 24 Powder X-ray Diffraction (XRD) Techniques Precise Lattice Parameter Measurements (Review) Residual Stress Measurements EMSE 312 DIFFRACTION PRINCIPLES
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
EMSE 312 – Diffraction Principles Remaining Classes Today – Nov. 22: Precise Lattice Parameter – Review and examples Residual Stress Measurements Monday – Nov. 29: Chemical Analysis Using X-ray Techniques (Cont) Qualitative and Quantitative Analysis Thursday – Dec. 2: Last Class Analytical Electron Microscopy X-ray Spectroscopy (WDXS and EDXS) Wrap-up (including texturing) Independent Study: Review of the 2 nd half of the course Review of Old Exams
Image of page 2
EMSE 312 – Diffraction Principles Diffraction Techniques - XRD Precise Lattice Parameter Determinations Indirect Method Measure 2 θ Determine d hkl (reciprocal space) Calculate lattice parameters (real space) from d-spacings Sample Detector 1 θ 2 θ hkl 2d sin θ λ = 2 2 2 hkl hkl 2 2 2 a d a d h k l h k l = = + + + +
Image of page 3

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
EMSE 312 – Diffraction Principles Diffraction Techniques - XRD Precise Lattice Parameter Determinations sin θ Δ vs. θ Δ Small Error for θ≈ 90 o Extrapolation of data points to θ ≈ 90 o What function should be used? ( ) o 90 a lim a θ θ =
Image of page 4
EMSE 312 – Diffraction Principles Diffraction Techniques - XRD Precise Lattice Parameter Determinations – Example 2 sin θ or 2 cos θ
Image of page 5

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon