Chemistry 356

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Chemistry 356

• Solid state

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Unit cell determination
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http//boomeria.org/chemlectures/crystals/basic.jp
g
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(No Transcript)
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a ? b ? c a ? g ? 90, b 90
a b c a ,b, g ? 90
a b c a b g 90
a b ? c g 120
a b ? c a b g 90
a ? b ? c a ? b ? g ? 90
a ? b ? c a b g 90
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Close packing
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Close-packing
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Octahedral and tetrahedral holes
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Tetrahedral and octahedral holes in ccp
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a-tin structure
FCC (CCP) with Sn atoms in half of the
tetrahedral holes
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Determining formulas
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Various units cells
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Structure map for MX compounds
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Structure map for MX2 compounds
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Piezoelectric crystals
http//www.mrsec.wisc.edu/Edetc/SlideShow/slides/p
iezoelectricity/piezoelectric_crystals_mov.html
http//www.mrsec.wisc.edu/Edetc/SlideShow/slides/p
iezoelectricity/piezoelectric_motion_mov.html
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zeolites
Large holes/channels to accommodate
ions/molecules (interstitial)
The micro-porous molecular structure of a
zeolite, ZSM-5
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Schottky and Frenkel defects
Perfect crystal
Schottky defect
Frenkel defect
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Types of alloys
Substitutional alloy
Interstitial alloy
Intermetallic compound