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Unformatted text preview: ’!__——4 3.19. Draw a BCC unit cell. List the atom positions for the eight comer atoms and one body
centered atom; Consider a unit cell offset from this ﬁrst cell by three cells in [100], 2 cells in
[010], and 4 cells in [001]. What are the atomic coordinales of the bodycentered atom in this
second unit cell? coil
«xi 3 .20. A. Draw an FCC unit cell. Using another diagram to identify:
B. the (121) plane.
C. the [121] direction
D. the (1,2,1) position.
E. Suppose the material in question is FCC Ni with a lattice parameter of
W 0.3 542 nm, estimate the atomic radius of a nickel atom.
QOD‘ F. The atomic weight of Ni is 53.70 g/mole. Use the unitcell information above
“T to estimate its density. 4. 4. Is the giass transition temperature for a piece of window glass above or below room
temperature? Why? T Lemma GLMS e. M hm. } . NR5 was; %%WS Maw: mute; Racism“) k. N.) k L.\ 99‘ 4.8. (A) The viscosity of a 7740 silicabased glass (like Pyrex) is 1012 Pa—s at 600 OC and is 106
I’aus at 1000 0C. Using an Arrhenius model for the temperaturedependent viscosity, calculate
the temperature at the glass strain point where the viscosity is 10‘” Pas. Ciearly show your
work.  (B) Sketch qualitatively — exact numbers are not required  the variation of viscosity as a function
of temperature. EL _ E a 1 f T
“rbe— WEWR erg’ EML '9”? v;
ﬂé‘i’xTC‘Q .3, 3U.®\2\= thbt qu @ ...
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 Spring '09
 LIBERA

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