EMS162_2011_Lecture14

EMS162_2011_Lecture14 - (Does not meet the criteria for *,...

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Yayoi Takamura 2/17/2011 EMS 162 - Winter 2011 50 Temperature Factor, t Yayoi Takamura 2/17/2011 EMS 162 - Winter 2011 51 Example Calculation – FCC Copper
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Yayoi Takamura 2/17/2011 EMS 162 - Winter 2011 52 Example Calculation – FCC Copper 0 20 40 60 80 100 120 140 0 20 40 60 80 100 Normalized Intensity 2 theta (degrees) "Stick diagram" for Cu ( a =3.61Å) λ =1.54185 Å Yayoi Takamura 2/17/2011 EMS 162 - Winter 2011 53 Powder Diffraction File (PDF card) ID Number Chemical formula and name Diffraction method and reference Crystallography data Optical properties Data on specimen Quality mark Diffraction Data
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Yayoi Takamura 2/17/2011 EMS 162 - Winter 2011 54 Quality Mark Star – Best quality – (Well characterized chemically and crystallographically, no unindexed lines, 2 ө≤ 0.03º) I (Indexed) – Minor warning – (Well characterized chemically, no unindexed strong lines, 2 ө≤ 0.06º) O Major warning – (Poorly characterized, with editorial comment explaining the reason) B (Blank) – Significant warning
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Unformatted text preview: (Does not meet the criteria for *, I, O) R (Rietveld) (d spacing values obtained from Rietveld refinement) C ( Calculated) (Author calculated d values from known crystal structure) H (Hypothetical) Yayoi Takamura 2/17/2011 EMS 162 - Winter 2011 55 Powder Mixtures Al 2 O 3 30 40 50 60 70 500 1000 1500 25.58 28.28 32.8 35.12 37.76 43.34 47 52.52 55.8 57.5 59.7 61.28 66.48 68.2 70.54 Intensity (a.u.) 2 theta (degrees) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Yayoi Takamura 2/17/2011 EMS 162 - Winter 2011 56 Cubic Crystals Cullity Yayoi Takamura 2/17/2011 EMS 162 - Winter 2011 57 Cullity Peak Indexing Peak # 2 sin 2 hkl s=h 2 +k 2 +l 2 sin 2 /s d hkl a () Repeat for simple cubic, BCC, and FCC until sin 2 /(h 2 +k 2 +l 2 ) is a constant for all peaks Copper Yayoi Takamura 2/17/2011 EMS 162 - Winter 2011 58 Non-Cubic Crystals Cullity...
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EMS162_2011_Lecture14 - (Does not meet the criteria for *,...

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