Dielectric constants what is the limit

  • #1
Hi there,

Do we know which material has the highest dielectric constant (exact figures would be nice),and what is the highest break down voltage achievable for that particular material.
 
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  • #3
f95toli
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The dielectric constant is temperature- and frequency dependent (in some materials there is a very strong dependence) which is why it is difficult to give exact values. High dielectric constants are also very difficult to measure with good accuracy.

A good example is strontium oxide (STO) which has a dielectric constant of about 300 or so at RTand MW freuquency, but that values goes up to to tens of thousands at cryogenic temperatures (unless you go up to about 1 THz or so when it drops down to about 10 or so)
 
  • #4
I once did a back-of-the-napkin calculation that, if we assume an electron is a dielectric-filled shell (mass) with a uniform surface charge (... total charge e ), the dielectric relative dielectric constant of the electron would be about 432. Probably not right.

I've changed my model a bit in the past year, but it's an interesting question to raise. What is an electron? No one knows. Anyone who says they do, is a liar.

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