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Interstitial Sites (FCC & BCC)

Naming Crystal Structures 9 •We define a structure type as a specific configuration of atoms. •Two materials have the same structure type if the atoms in the crystal structure have the same configuration and connectivity. The lattice parameters will …

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Interstitial Sites (FCC & BCC) - University of North Texas

lamma.engineering.unt.edu

Interstitial Sites (FCC & BCC) 1 •In the spaces between the sites of the closest packed lattices (planes), there are a number of well defined interstitial positions: •The CCP (FCC) lattice in (a) has 4 octahedral, 6-coordinate sites per cell; one site is at the cell

  University, North, Texas, Interstitial, Octahedral, University of north texas

Introduction: X-Ray Diffraction

lamma.engineering.unt.edu

Introduction: X-Ray Diffraction class24/1 • XRD is a powerful experimental technique used to determine the – crystal structure and its lattice parameters (a,b,c,a,b,g) and – spacing between lattice planes (hkl Miller indices)→this interplanar spacing (d hkl) is the distance between parallel planes of atoms or ions.

  Diffraction, Ray diffraction

Types of Lattices - University of North Texas

lamma.engineering.unt.edu

•Notice that point 1 (½, ½, ½) at cube center and point 2 (0,0,0) at cube vertices have an identical 8-fold environment. The P-cubic lattice The extended F-cubic lattice The F-cubic lattice •This is a Bravais lattice because the 12-fold coordination of each lattice point is identical. 10

  Cube, Lattice

XRD Intensity Calculations - University of North Texas

lamma.engineering.unt.edu

2 (Rutile ) 0.0 0.2 0.4 0.6 0.8 1.0 0 2 4 6 8 10 12 14 16 18 tor (f) sinT/O Ti+4 (f values from appendix 12) O-2 (f values from appendix 12) Ti+4 (f values interpolated for I 110 & I 001) O-2 (f values interpolated for I 110 & I 001)

  Intensity, Rutile