Hexagonal YMnO(3).
The crystal structure of hexagonal yttrium trioxomanganate has been determined at room temperature and at 180 K. It is isomorphous with LuMnO(3). The Mn displacement vector has a frustrated component in the ab plane and a ferroelectric part along the c axis. The net ferroelectricity is zero due to inversion twinning, with 1:1 twin fractions.
van Aken
B B
BB
Inorganic Solid State Chemistry Laboratory, Materials Science Center, Groningen University, Nijenborgh 4, NL-9747 AG Groningen, The Netherlands.
Meetsma
A
A
Palstra
T T
TT