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

A Origin of the polarization in BaTiO3 unit cell

  1. Sep 23, 2017 #1
    hi, in perovskite crystal, such as BaTiO3, due to the off-centre of Ti ion, there exists a polarization moment in the unit cell (as shown in below link). my question is: does the disposition of Ti atom lead to seperation of electron cloud from the nuclei of the Ti atom and so the Ti atom plays as a electric dipole ?

    https://www.comsol.com/blogs/piezoelectric-materials-crystal-orientation-poling-direction/

    Perovskite-unit-cell.png
     
  2. jcsd
  3. Sep 23, 2017 #2
    Not really. The Ti atom itself is in the 4+ state so that the whole unit cell acquires a dipole moment. You should probably look up the definition of the dipolar moment and calculate it for a perfectly symmetric and a distorted unit cell. Just think of the atoms as charged points. It is really that simple.
     
  4. Sep 23, 2017 #3
    so if the dipole moment of the unit cell is because the Ti atom is in 4+ state. So when is the Ti atom in the 4+ state ? for a perfectly symmmetric cell or distorted cell ?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Origin of the polarization in BaTiO3 unit cell
Loading...