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ConceptCheck3

# ConceptCheck3 - decreases as the values of h k and l...

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49 Concept Check 3.1 Question: What is the difference between crystal structure and crystal system? Answer: A crystal structure is described by both the geometry of, and atomic arrangements within, the unit cell, whereas a crystal system is described only in terms of the unit cell geometry. For example, face-centered cubic and body-centered cubic are crystal structures that belong to the cubic crystal system.

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69 Concept Check 3.2 Question: For cubic crystals, as values of the planar indices h, k, and l increase, does the distance between adjacent and parallel planes (i.e., the interplanar spacing) increase or decrease? Why? Answer: The interplanar spacing between adjacent and parallel planes
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Unformatted text preview: decreases as the values of h , k , and l increase. As values of the planar indices increase, the magnitude of the denominator in Equation 3.14 increases, with the result that the interplanar spacing ( d hkl ) decreases. 72 Concept Check 3.3 Question: Do noncrystalline materials display the phenomenon of allotropy (or polymorphism)? Why or why not? Answer: Noncrystalline materials do not display the phenomenon of allotropy; since a noncrystalline material does not have a defined crystal structure, it cannot have more than one crystal structure, which is the definition of allotropy....
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