HW 6 Solutions - Homework 6 5.5(a Atomic radius crystal...

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Homework # 6 5.5: (a) Atomic radius, crystal structure, electronegativity, and the most common valence are tabulated below, for several elements. Which of these elements would you expect to form a substitutional solid solution with nickel having complete solubility . Element Atomic Radius (nm) Crystal Structure Electronegativity Valence Ni 0.1246 FCC 1.8 +2 Ag 0.1445 FCC 1.9 +1 Al 0.1431 FCC 1.5 +3 Co 0.1253 HCP 1.8 +2 Cr 0.1249 BCC 1.6 +3 Fe 0.1241 BCC 1.8 +2 Pt 0.1387 FCC 2.2 +2 Zn 0.1332 HCP 1.6 +2 So the sample must have the same crystal structure – FCC And the sample should have the same valence - +2 0.1059 < r < 0.1433 And a radius in the range 0.1059 < r < 0.1433 So the element with full solid solubility would be Pt (platinum) even though the electronegativity is a bit high at +0.4. 5.6: (a) Suppose that CaO is added as an impurity to Li 2 O. If the Ca +2 substitutes for Li + what kind of vacancies would you expect to form? How many of these vacancies are created for every Ca +2 added? Cation vacancies ( + ion vacancies) should form: One for every Ca +2 added.
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