Powder neutron diffraction study of phase transitions in and a phase diagram of(1−x)[Pb(Mg1∕3

Presence of a monoclinic (Pm) phase in the morphotropic phase boundary region of multiferroic (1 − x)Bi(Ni1/2Ti1/2)O3-xPbTiO3 solid solution: A Rietveld study

“…We observed significant anisotropic peak broadening in our BNT-PT samples for the compositions close to MPB. It is well known for the MPB systems like PZT [3,49] and PMN-PT [48] that anisotropic broadening of the diffraction profiles is 12 observed for the rhombohedral as well as tetragonal compositions close to the MPB.…”

Real space mapping of polarization dynamics and hysteresis loop formation in relaxor-ferroelectric PbMg1/3Nb2/3O3–PbTiO3 solid solutions

“…PMN-32%PT and PMN-35%PT already exhibit a long-range ferroelectric order at room temperature described by the monoclinic Pm phase. 16,17 In all three samples, T B is about 650 K. The ͑001͒ crystal surfaces were mirror-polished using a series of diamond pastes for PFM examination and supplied with counter electrodes ͑silver paint͒.…”

Recent Advances in Processing, Structural and Dielectric Properties of PMN-PT Ferroelectric Ceramics at Compositions Around the MPB

“…These results showed that the intrinsic width of the MPB is an order of magnitude smaller than previously believed and that the structure changes abruptly around x = 0.34-0.35, from monoclinic (Pm) to tetragonal (P4mm). Subsequent studies revealed that the structure of the PMN-PT is rhombohedral (R3m) for x < 0.27, M B +M C (Cm+Pm) phase coexistence for 0.27 < x < 0.30, M C +T (Pm+P4mm) phase coexistence for 0.30 < x < 0.34, T+M C ( P4mm+Pm) phase coexistence for 0.34 < x < 0.39 and tetragonal (P4mm) for x > 0.39 (Singh & Pandey, 2003;Singh et al, 2002;Li et al, 2006). A study of the molar fractions of different phases in the MPB by Singh and Pandey (Singh & Pandey, 2003) shows that for M B +M C phase coexistence the amount of M B is majority (80-100%), the M C phase is dominant (70-100%) for M C +T phase coexistence, while for the T+M C phase coexistence region the amount of tetragonal one increases from 40% to 70% when x increases from 0.35 to 0.39.…”

“…The stability of the monoclinic phase at low temperatures and the phase coexistence in the MPB of the PMN-PT system has also been frequently discussed in the literature. The phase coexistences in this system on zero-field cooling were considered in recent experimental works by using neutron diffraction, high-resolution X-ray diffraction and dielectric analysis (Singh & Pandey, 2006;Li et al, 2006). These studies have discussed the possibility of tetragonal-monoclinic (T-M C ) and tetragonal-monoclinic (T-M B ) phase coexistence in unpoled PMN-PT ceramics in a wide temperature range.…”