Final version Structure and Bonding.docx - {Prelim Guide Navbox =Unknown Semesters= =G Thomas= =First Semester= Define a lattice Why do materials bond

Final version Structure and Bonding.docx - {Prelim Guide...

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{{Prelim Guide Navbox}} ==Unknown Semesters== ===G. Thomas=== ====First Semester==== Define a lattice. Why do materials bond together? Define 4 types of bonding and give examples. How is the bond type apparent in the material's mechanical properties? ====Second Semester==== What is the alloy system of your research? (answered Al-Li) What is the crystal structure of the ordered d' phase? What is the difference between a primitive cell and a unit cell? How would the diffraction pattern for a DNA molecule look? What is the type of bonding in Li? In He? What are the physical origins of these bonds? ===Prof. Bragg=== *What are the coordinates of the largest interstitial sites in fcc? How many are there per unit cell? What about in bcc? In an ionic material with the anions and cations the same size, why can we not have 12-fold coordination? What is the c/a ration of hcp? *Calculate the density of BaO, which has the NaCl structure. (Given the two atomic weights and the lattice parameter) ===D. de Fontaine=== *Draw the energy levels for the hydrogen atom. Write an expression for the energy levels. What calculation must be done to find this expression? *Now bring two hydrogen atoms together. What happens? What is the equilibrium separation? What happens at zero separation? Why? *Bring 2 Na atoms together. Will they bond? Assume they do; plot energy vs. separation and explain. Could you calculate this the same way as for the hydrogen atom? *Explain the difference between metallic and covalent bonding. *Consider tin. What sort of bonding does it have? How many nearest neighbors? *What is the structure of graphite? What is the bonding type between the sheets? *What sort of lattice does GaAs have? Give appropriate coordinates for the basis, if Ga is at 000. What kind of void is occupied by As? How many of these voids are there in an fcc lattice and how man of them are occupied? ===A. Searcy=== *What is your research material? What is its crystal structure?
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*Describe the structure of silicon. What type of bonding occurs? *What is a possible structure for SiC? Where might the C atoms go? *What is the structure of graphite? Would you expect it to conduct electricity? ==Fall 1986: G. Thomas== *Draw an fcc unit cell. Can you put atoms anywhere else in this cell? Are there any restrictions on the number of atoms per unit cell? What are the translation vectors if the unit cell has 4 atoms? If it has one atom? (i. e. what is the primitive cell?) Draw an orthorhombic unit cell. How is it defined in terms of lengths and angles? Draw a face-centered orthorhombic unit cell. If you put an atom halfway along the c-axis, how would the unit cell change? *How can you determine structure? What would happen if there were a lot of atoms in the unit cell? What determine when you see the lines? *What kind of bonding does an element with an fcc structure have? Explain metallic bonding. Why are some metals fcc and some bcc?
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  • Winter '15
  • WANG, SUE-LEIN

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