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THEORY 0F FERR0ELECTRICITY AND ELECTR0NIC STRUCTURE
Ferroelectricity of Ice?
Lattice Dynamics of Diatomic Crystals of High Dielectric Constant
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absorption aragonite atoms behavior Brillouin zone calculation Cochran coefficients components considered corepresentation corresponding critical temperature Curie law Curie temperature dielectric constant dielectric function dipole discussed displacement eigenvectors electric field electronic equation equilibrium experimental ferroelectric ferroelectric crystals ferroelectric phase film force constants free energy function given by Eq GMC Warren Hamiltonian harmonic approximation impurity infinite wavelength infrared instability interaction invariant ionic irreducible representation Landau theory lattice dynamics linear Lorentz macroscopic mode frequencies modes of infinite molecule nitrate ion normal coordinates normal mode obtained order phase transition order transitions oxygen parameters particles perovskite phase change phonon Phys polarizability potassium potential energy properties R. A. Cowley Research Laboratories restoring force second order phase shell model shown in Fig SnTe space group stability structure surface symmetry operation TABLE temperature dependence tensor theory of ferroelectricity thickness transformation transition temperature transverse optical modes unit cell values wave vector zero