Difference between a flexo electric and peizo electric material

[vinven7]

Hello,
I'm struggling to understand the exact conceptual difference between a flexo electric and peizo electric material. I mean, they seem more or less the same. could anyone please help me understand?

 

[Dr Lots-o'watts]

Here's a nice introduction.
http://cmt.dur.ac.uk/sjc/thesis_dlc/node130.html

Piezoelectricity usually refers to crystals (that don't "flex") where the polarity is most often along a single direction.

Flexoelectricity is somewhat broader and includes liquids in which the dipoles can also flip around.

 

[vinven7]

thanx Dr lot's of watts.