Electron microscopy
 
Order–Disorder Ferroelectrics
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There are mainly two classes of ferroelectric phase transitions: displacive (e.g. barium titanate: BaTiO3) and order-disorder (e.g. NaNO2). In an order-disorder ferroelectric material, there is a dipole moment in each unit cell, while it points in random directions at high temperatures. For instance, Tsuda et al. [1] suggested that the phase transformations in BaTiO3 ferroelectric crystals have an order-disorder character, namely only the rhombohedral phase has an ordered structure but the orthorhombic and tetragonal phases have disordered structures.

 

 

[1] K. Tsuda, R. Sano, and M. Tanaka, Phys. Rev. B 86, 214106 (2012).

 

 

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