04_250S08_Struct_Ceramics

04_250S08_Struct_Ceramics - Scanning Electron Microscopy...

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Unformatted text preview: Scanning Electron Microscopy Image of a Diamond thin film Scanning Electron Microscopy Image of a Diamond thin film Structure of Structure of Ceramics Ceramics QuickTime and a Photo - JPEG decompressor are needed to see this picture. The unit cell is a convenient representation, but metals are NOT molecular, and the U.C. isn’t a molecule. Remember to visualize the near infinite extent of the lattice, beyond the confines of the unit cell. bcc structure: CN = 8 QuickTimeþ and a Photo - JPEG decompressor are needed to see this picture. FCC fcc structure: CN = 12 QuickTime and a Photo - JPEG decompressor are needed to see this picture. HCP hcp structure: CN = 12 Simple Cubic Structure “hard-sphere” space-filling model: Note the large interstitial spaces between the atoms QuickTime and a TIFF (LZW) decompressor are needed to see this picture. Ceramics: Often two atoms of widely varying ionic radius DC/CO = cos 30 = sqrt(3)/2 = r a /(r a +r c ) thus, r c /r a = 2/sqrt(3) - 1 = 0.155 C D O r c r a 5...
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This note was uploaded on 03/19/2008 for the course MSE 250 taught by Professor Grummon during the Spring '08 term at Michigan State University.

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04_250S08_Struct_Ceramics - Scanning Electron Microscopy...

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