Materialism: A Materials Science Podcast
Nov 5, 2026 · 43 min · 13 segments
What do a ruby, a transistor, a blue LED, and a quantum sensor have in common? They all work because of point defects. To celebrate the 100th anniversary of the point defect, we sit down with Dr. Mike…
Taylor SparksHostAndrew FalkowskiHost
So just to remind people, a Frenkel versus a Schottky defect, the differences, right? So the Frenkel defect, you take an atom and it just leaves its site.
can mean you're like ionic crystals, right?
You have a missing cation and has to be compensated by the appropriate number of missing anions for charge neutrality.
And that was, so, so Franco was just talking about like atoms, you know, can't be destroyed.
And then, yeah, Wagner and Schottky realized that charge compensation, charge neutrality is a super important part when you have insulators and semiconductors.
So in the 100 years since these things were sort of discovered, clearly they've been important.
And your whole point of your sort of 100 years of point defects, part of it is sort of future looking.
Maybe we'll begin with just briefly like why these things are interesting or useful.
So just to remind people, a Frenkel versus a Schottky defect, the differences, right? So the Frenkel defect, you take an atom and it just leaves its site.
can mean you're like ionic crystals, right?
You have a missing cation and has to be compensated by the appropriate number of missing anions for charge neutrality.
And that was, so, so Franco was just talking about like atoms, you know, can't be destroyed.
And then, yeah, Wagner and Schottky realized that charge compensation, charge neutrality is a super important part when you have insulators and semiconductors.
So in the 100 years since these things were sort of discovered, clearly they've been important.
And your whole point of your sort of 100 years of point defects, part of it is sort of future looking.
Maybe we'll begin with just briefly like why these things are interesting or useful.
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