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12 ^1118 r^llel ZE +a 71. illd g Et rlxl d C "J B4 z}(Uody-centered lattice: bcc)E ql 87llel fl.zlzl E714,+q ill +Cql lzlJq trfl 1-171+ zJol g*nlel ,] 4z)A flzlzl ulg€ 44+zol4. (a) (b) (c) :.aJ Ffi illcgoJ4^lel E+lEe+ g^lel HHE 'JolilE 1HE AolE Azl*i(lattice constant, lattice parameter)el a}.]. ^l-E d+ all 9l= flzlE a=d flzl(nearest neighbor)4z t4. r +rJE 44= JdflzI zf zl4(interatomic distance), ?doil 9l= lz]lE flzlE Cz++ 4 a- 9zI +glql gl = a=dflz}9 += Elgl+(coordination number)?-l-r. ++. 4C'Jo}4zl9 a=d 9zI9 Ell9+= tr? 1-17lel (a)41^l "J + llFol 8zNo14. ol tfl4zlql +6I= flzlE sz]]el -E^lElql 1/8"Jol 4all 9lt- +Cql Sd.J 17l]E flzlzl- EqgleE-tr d 4 el flzlfE 2t\o1q. l/8x8+L=27i trBl-1814 €"1 flz}9 =d flzlz} ,l 4: 4zl]i- f ( t A= 10-ucm )E a, flzle}a g n (a) ol + 6l-H ill c ql4dE 4 olE 4R ol Ir E (4 R)2 = az t a2 * a2 ral 1-1g bccgl =tr R= ({i t0 a z} € +. flrf Zi 7l al ol +9l4zI LIql flzlzl xlzl6I= flzl?dg(atomic packingfactor)g +gr+ ,Jq. +914 zlel +i4= a3ol E E flzl.?dgg \Bvoolr 4 zI +Ag B2vo"l+. 4 _, \ ./3a,.s flz1+ds= ffi - T "\T'T ) =f = 0.6802