Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Dielectric constant in few-layer and in bulk materials

  1. Jul 26, 2015 #1
    Why is the dielectric constant smaller in few-layer materials than in bulk materials?
     
  2. jcsd
  3. Jul 28, 2015 #2
    I believe this is an open research topic, at least for materials such as SrTiO3 known as incipient ferroelectrics . For SrTiO3 an optical phonon mode is soft within harmonic approximation in bulk samples and is responsible for the high dielectric constant . Somehow (several mechanisms exist in literature) , this phonon mode gets hardened in thin films and as such the dielectric constant is much smaller for the thing film. I would interested to hear any insights on this topic.

    See this article as an example:
    http://www.nature.com/nature/journal/v404/n6776/full/404373a0.html
     
    Last edited by a moderator: May 7, 2017
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Dielectric constant in few-layer and in bulk materials
Loading...