Nuclear and magnetic structures of sodium ruthenate (VI) have been studied by neutron powder diffraction in the temperature range 1.5–200 K. Na<Subscript>2</Subscript>RuO<Subscript>4</Subscript> crystallizes in the monoclinic structure, with space group P 2<Subscript>1</Subscript>/c. The structure consists of apical corner sharing RuO<Subscript>5</Subscript> trigonal bipyramids...</subscript></subscript></subscript></subscript>

The size effect of the dielectric properties and the barrier height was investigated in the ferroelectric solid solution Ba<Subscript> x </Subscript>Sr<Subscript>1−x </Subscript>TiO<Subscript>3</Subscript> system. The decrease of the grain size causes the suppression of the ferroelectricity, and the increase of the relaxation frequency. Barrier heights increase...</subscript></subscript></subscript>

Motivated by recent experiments demonstrating suppression of ferroelectricity with pressure in SrTi<Superscript>18</Superscript>O<Subscript>3</Subscript>, the dynamics of the phase transition mechanism are reinvestigated within a nonlinear polarizability model. For temperatures far above the phase transition polar micro domains are formed which...</subscript></superscript>

In the presence of a surface the Landau-Devonshire equations of ferroelectricity must be extended to include a boundary condition. For a ferroelectric with a second-order transition in the case when the polarization p(z) increases at the surface, it is well known that a surface state occurs in a...