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PROBLEMAS TEMA 1


1. Calcular la densidad y el FEA del Cu (FCC) y del UO2 (con estructura igual al CaF2).
Dibuja la celdilla unidad de cada uno de ellos y explica los resultados.


Datos: Pm (Cu)= 63.54 g/mol, Pm (U4+) = 238 g/mol, Pm (O2-) = 16 g/mol, R (Cu)=
0,1278 nm, R(U4+) = 0,105 nm, R(O2-) = 0,132 nm


Cálculo de densidades y factor de empaquetamiento atómico:

# atoms/unit cell Atomic weight (g/mol)

 nA FEA= Vátomos/Vcelda
Volume/unit cell VcNA Avogadro's number
(cm3/unit cell) (6.023 x 10 23 atoms/mol)




Cu.
Estructura del Cobre



Nº de átomos = 4
º Pm (Cu)= 63.54 g/mol
RCu= a √
V= a3 = (4RCu/√2)3




4 átomos x 63.54 g/mol
ρ = ------------------------------------------------------------ = 8,93 g/cm3
(4 x 0,1278 nm /√2)3 x 6.023 1023 átomo/mol




n a 2  4  3

FEA= Vátomos/Vcelda = = 0,74
a3
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