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APS8_14

APS8_14. M.J. Kramer July 1, 2012. 70 mm strip from center of the 6” wafer Data taken every 1 mm 4 detectors show some variation in texture. GE3. GE4. GE2. GE1. Azimuthal plots show this more clearly.

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APS8_14

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  1. APS8_14 M.J. Kramer July 1, 2012

  2. 70 mm strip from center of the 6” wafer • Data taken every 1 mm • 4 detectors show some variation in texture GE3 GE4 GE2 GE1

  3. Azimuthal plots show this more clearly

  4. GE 3 and GE4 show a very strong {220} while GE1 and GE2 have a weaker {220} and more contributions from {113} and {133}

  5. The {113} and {133} are only a few degrees from being strong scattering in this geometry. • Suggests something about the sample geometry, possibly curvature of the sample, since GE1 and GE2 are both below the horizon and GE3 and GE4 are above. • Also (112) only 19.5° from (111)

  6. Rietveld fitting provides a clearer idea of the reflections of the 2nd Ag phase. • Quantify the phase fraction via fcc (220) to the hcp peak • Roughly 2-4% • Broadening of the hcp peak and overlap

  7. GE4 GE4 • Indication of intercalations driving the phase transition? • Direct correlation between loss of the texture and disappearance of the hcp phase Disordered phase Discrete phase

  8. GE2 • Slightly different orientation provides a different perspective GE2

  9. GE1 • GE doesn’t show the disordered region • Loss hcp still correlates with loss of (220) texturing • Also the (220) texture is strong when hcp diffuse is weak

  10. GE3

  11. GE1 Proposed hcp model doesn’t get this right

  12. [111] • [-110] 11-2 1-10 11-2 111

  13. [001] 20° tilt from [001]

  14. Remove corner atoms • 2x2x2 unit cell • Shows the same layers as the hcp when viewed perpendicular 11-2 111

  15. The 2x2x2 seems to show the hcp but a,b stacking fails to connect rings correctly

  16. Isolated a, b layer in the 2x2x2 • Note when isolating the two layers, packing is not dense enough.

  17. Using the rhombohedral distortion SG 160 • Get a bit better fitting • Still have trouble with the side peak on the fcc (200)

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