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Aluminium has no negatively charged particles?

  1. Jul 26, 2013 #1
    Q: "A graduate student tells you that he has observed a Schottky defect in a sample of pure aluminium. Explain why it may take a long time for this graduate student to get his Ph.D"

    A: "Pure aluminium has no negatively charged particles, so a Schottky effect can not occur."

    So I know a Schottky effect is when both an anion (-) and a cation (+) dissappear together out of a material (both because it has to remain neutral). What I don't understand is why aluminium does not have negatively charged particles. It does have electrons so no I'm just not following here.. Can anyone explain this to me?
  2. jcsd
  3. Jul 26, 2013 #2


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    Staff: Mentor

    Schottky defect or Schottky effect?
    Based on your question, probably the defect.

    Where do you expect anions or cations in a sample of pure Al, where all atoms are the same?

    Aluminium has electrons, of course, but does it have many free electrons moving around?
    Hint: What do you see as hall effect?
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