Field‐induced phase transition in lead magnesium niobate

Abstract

and Physico-Technical Ioffe-Institute, Academy of Science8 of the USSR, Leningrad Field-induced Phase Transition in Lead Magnesium Niobate Dedicated to Professor 0. BRUMMER on the occasion of his 60th birthdayThe temperature dependence of the dielectric constant, polarization, and elastic compliance as well as the field dependence of the polarization and strain at different temperatures was measured a t lead magnesium niobate single crystals for three different directions. From the results some conclusions with respect to the symmetry of the field-induced ferroelectric phases can be drawn. Below -7 0 "C and after complete poling, the spontaneous polarization is probably directed along [ l l l ] .An Bleimagnesiumniobat-Einkristallen wurden die Temperaturabhiingigkeit der Dielektrizitatskonstanten, der Polarisation und der elastischen Nachgiebigkeit sowie die Feldstkrkeabhiingigkeit der Polarisation und der Dehnung bei verschiedenen Temperaturen gemessen, und zwar bei drei verschiedenen Beldrichtungcn. Die Ergebnisse ermoglichen einige Aussagen bezuglich der Symmetrie der feldinduzierten ferroelektrischen Phasen. Unterhalb -70 "C und nach vollstandiger Polung ist die Richtung der spontanen Polarisation wahrscheinlich parallel [lll].

Neutron scattering study of PbMg $_{\mathsf{1/3}}$Ta $_{\mathsf{2/3}}$O$_{\mathsf 3}$ and BaMg $_{\mathsf{1/3}}$Ta $_{\mathsf{2/3}}$O$_{\mathsf 3}$ complex perovskites

“…We remind that at T∼ 210 K PMN has an additional phase transition in an applied electric field 8 . However, even without application of an external electric field, properties like damping of longitudinal acoustic phonons 44 , and the width of quasielastic component in light scattering spectra 45 exhibit anomalies in PMN in the vicinity of this temperature.…”

“…The average crystal structure of PMN is cubic down to 5 K 7 . However, an applied electric field induces a structural phase transition at T∼ 210 K 8 . PbMg 1/3 Ta 2/3 O 3 (PMT) is a well-known ferroelectric and it was among the first studied relaxors 1 .…”

Stability of glassy and ferroelectric states in the relaxorsPbMg1∕3Nb2∕3OColla1, Vigil2, Timmerwilke3 et al. 2007Phys. Rev. B24260View full textAdd to dashboardCite

“…1͒ which show a broad hysteretic regime in which either a glassy relaxor state or a somewhat disordered ferroelectric ͑FE͒ state [1][2][3][4][5] can exist for long times. In trying to understand the nature of the glassy phase, it would be useful to know whether it is more thermodynamically stable than the ferroelectric phase ͓as indicated by some theoretical work concerning PMN ͑Ref.…”

Kinetics and thermodynamics of the ferroelectric transitions in PbMg1/3Nb2/3O3 and PbMg1/3Nb2/3O3-12% PbTiO3 crystals

“…In field-cooling (FC) at sufficient jEj a transition to the FE state is found, with the transition being abrupt in some crystalline samples lacking visible defects. [3][4][5][6][7] The same transition can also be reached by applying E after zero-field cooling (ZFC). Over a broad range of temperature (T), reducing E to zero leaves the material in a FE state.…”

“…[3][4][5][6][7] Even in the FE state, a substantial fraction of the material can remain disordered, with FE nanoregions imbedded in a more disordered glassy matrix, 8,9 as expected theoretically for similar materials. 10 In PMN-12%PT a FE state has been shown to be more stable than the unpolarized state below a transition temperature even when the electric field E ¼ 0, but results on the phase stability in pure PMN were less definite.…”