Re: an experiment with dielectrics

Thanks for the replies for my post on my dielectric experiments!

Several people have suggested that it might be air bubbles in the
dielectric paste, so I performed another experiment in which I made
a thick paste out of titanium dioxide and water and then put it on
a vibration platform and in a bell jar and sucked it down to a decent
vacume (1 torr) while vibrating the heck out of it.  After 5 minutes
of vacume and vibrating, I slowly let the air back in and then
carefully smeared the degassed pasted onto my capacitor plates and
measured the capacitance.

There is no substantial difference between the 'airy' and the non-
airy titanium dioxide/water paste.  I think it's something besides
air bubbles.

Perhaps the dielectric needs to be fired into a ceramic, as mentioned
by Bert Hickman.

I am not sure I have the equipment for melting Titanium dioxide or
manganese dioxide.  Any suggestions?


                     Kevin D Christiansen
      User Interface Group - The University of Virginia
              "The best VR that pizza can buy" 
   kevin-at-virginia.edu    http://www.cs.virginia.edu/~kdc4n/

"The universe is composed of space, galaxies, and intergalactic
 dust.  Galaxies themselves are composed of space, stars, and
interstellar dust.  From the omnipresence of dust, we conclude
that nature abhors a vacuum and won't pick up a broom, either."