Dielectric and pyroelectric properties in the Pb(Mg_1/3Nb_2/3)O₃-PbTiO₃system

Investigation of the electrocaloric effect in a PbMg2/3Nb1/3O3-PbTiO3 relaxor thin film

“…4 PbMg 2/3 Nb 1/3 O 3 ͑PMN͒ is a well-known relaxor that develops long-range dipolar order by adding a certain amount of the ferroelectric perovskite PbTiO 3 ͑PT͒. [6][7][8] The phase diagram of the mixed solid solution ͑1−x͒PMN-xPT has generated some controversy, particularly in x Ͻ 0.3 where relaxor compositions form. The existence of a structural phase transition in relaxor PMN-PT is debatable.…”

Role of the TiO6 octahedra on the ferroelectric and piezoelectric behaviour of the poled PbMg1/3Nb2/3O3–xPbTiO3 (PMN–PT) single crystal and textured ceramic

“…According to the X-ray diffraction the high temperature symmetry is cubic with the Pm3m space group [9][10][11][12][13][14][15][16][17][18]. As we already mentioned for such symmetry the first order Raman activity is forbidden.…”

“…Different phase diagrams have been proposed [9][10][11] (see Figure 1). According to the common part of these zero-field phase diagrams the PMN-PT solid solutions with the PT content lower than 30% posses the typical relaxor behaviour characterized by the broad and strongly frequency dependent maximum of dielectric permittivity.…”

Development of ferroelectric order in relaxor(1−x)Pb(Mg1/3Ye1, Bing2, Gao3 et al. 2003Phys. Rev. B

“…The substitution of Ti 4+ for the complex (Mg 1/3 Nb 2/3 ) 4+ ions in the solid solution system between relaxor PMN and ferroelectric PbTiO 3 [PT], (1-x)PMN-xPT [PMN-xPT], results in a macroscopic ferroelectric phase with a morphotropic phase boundary (MPB) initially located at x ≈ 0.33, [22][23][24] separating the rhombohedral (relaxor side of the solid solution) and tetragonal (ferroelectric side) phases. Single crystals of PMN-PT with composition near the MPB are technologically promising materials for electromechanical transducers thanks to their excellent piezoelectric performance.…”