1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Piezoelecric Crystals

  1. Jun 23, 2010 #1
    If a constant pressure is kept on a piezoelectric crystal, will it continue to generate an electric field?
     
  2. jcsd
  3. Jun 23, 2010 #2

    Andy Resnick

    User Avatar
    Science Advisor
    Education Advisor

  4. Jun 23, 2010 #3
    Actually, if you try this you will notice that the voltage drops back to zero quite quickly (seconds).
    This is because the crystal is not a perfect insulator, and because you must extract some current to measure the voltage.
     
  5. Jun 23, 2010 #4

    K^2

    User Avatar
    Science Advisor

    Yeah, when you deform a piezoelectric crystal, a voltage builds up. But that means that there is going to be a force acting on any free charges hanging around, which will try to rearrange themselves to cancel the voltage. So after a while the crystal should be neutral again.
     
  6. Jun 23, 2010 #5
    Thanks for the help :)
     
  7. Jun 23, 2010 #6
    You may be interested in Ferroelectric materials too. These have constant electric fields wihout the need to apply a stress.
     
  8. Jun 24, 2010 #7
    You don't say. I'll be off to read up on them right now. Thanks :)
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook