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Would you expect UO2 to have the sodium chloride, zinc blende, or fluorite structure? Justify your choice. Based on your answer, determine (a) the lattice parameter, (b) the density, and (c) the packing factor. 9. 4
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Answer #1

UO2 is the most widely used nuclear fuel in most com­mercial power reactors.

So using Fluorite (CaF2) with UO2 is mostly preferred in this case.

One of the beneficial effects of using UO2 is its high melting point (2860 °C), thus giving it excellent stability. UO2 structure has more empty space than a UC structure due to the simple cubic structure of the interior F~ sub-lattice. Even though this feature aids in providing more space for the fission products to accumulate inside the structure, it also reduces the fissile atom density.

As Loe have considlesed CCaF (a) Lattice porometea+ Artus n1c.wd1A+S ef uTanfurn and oxygen The at and F fons touch a short dstan alona the b bond beCime as 3 3

ate unit cell .096 .1 (b) the densi 2% sens mass Atomic oeiaht UO 238+2(6 s Number 1i 10.155 594 3/3

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