Electronic transitions and dielectric functions of relaxor ferroelectric Pb(In1∕2Nb1∕2)O3-Pb(Mg1∕3Nb2∕3)O3-PbTiO3 single crystals: Temperature dependent spectroscopic study

Abstract

Articles you may be interested inBroadband inelastic light scattering study on relaxor ferroelectric Pb(In1/2Nb1/2)-Pb(Mg1/3Nb2/3)O3-PbTiO3 single crystals Electrocaloric properties in relaxor ferroelectric (1−x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 system Phase transition behaviors in relaxor ferroelectric [001]-poled Pb(In1/2Nb1/2)O3-Pb(Mg1/3Nb2/3)O3-PbTiO3 single crystals studied by Brillouin light scattering and dielectric spectroscopies Optical properties and phase transitions of Pb(In 1=2 Nb 1=2 )O 3 -Pb(Mg 1=3 Nb 2=3 )O 3 -PbTiO 3 (PIN-PMN-PT) crystals near morphotropic phase boundary (MPB) have been investigated by temperature dependent transmittance and reflectance spectra. Three critical point energies E g ¼ 3.17-3.18 eV, E a ¼ 3.41-3.61 eV, and E b ¼ 4.74-4.81 eV can be assigned to the transitions from oxygen 2p to titanium d, niobium d, and lead 6p states, respectively. They show narrowing trends with increasing temperature, which can be caused by thermal expansion of the lattice and electron-phonon interaction. Deviation from the linear behaviors can be observed from E a and E b versus PT concentration, indicating a complex multiphase structure near MPB region. V C 2014 AIP Publishing LLC. [http://dx.

Phonon modes and local polar distortions in nanoclusters of Pb(In1/2Nb1/2)O3-Pb(Mg1/3Nb2/3)O3-PbTiO3crystals probed by terahertz reflectance spectra and Raman scattering

“…The polar phonons of PMN give the total contribution to static permittivity about 1000, which corresponds roughly to the dielectric constant in the frequency range of 10-100 GHz [25]. This leads to much higher dielectric constants in the THz region than those in the ultraviolet region [26]. Figure 2 shows the real and imaginary parts of the dielectric functions, which describe the polarphonon absorption.…”