problems_section_4[1]

problems_section_4[1] - Problems – Section 4: Ceramics...

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Problems – Section 4: Ceramics and Semiconductors 1. List five engineering applications where a ceramic material is used and identify what major property or properties qualify that material as being suitable for that application. 2. Use a well-labeled energy-band diagram to explain why most ceramics are poor conductors. 3. GaAs is a compound semiconductor with the diamond-cubic crystal structure. Calculate the percent ionicity of the Ga-As bond. Also suggest what, if any, effect this ionic component may have on the relative positions of the Ga and As atoms as compared to, say, Si where atom pairs are located at (0,0,0) and (1/4, 1/4, 1/4). 4. Sintering additives are often used in the processing of ceramic powder. These additives typically promote the formation of a thin layer of amorphous ceramic in between powder particles. Briefly explain the advantage that such an approach would have over one where no additives is used and no inter-particle amorphous layer is formed. 5. Write the electron configurations (spdf notation) characterizing flourine (F) and lithium (Li). Use these to rationalize the electronegativity of each. Determine the degree of ionicity characterizing the bond between Li and F, and use this to develop a simple argument why LiF is partially soluble in water. LiI, on the other hand, is completely soluble in water. Justify this in
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This note was uploaded on 10/03/2009 for the course E e 344l taught by Professor Libera during the Spring '09 term at Stevens.

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problems_section_4[1] - Problems – Section 4: Ceramics...

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