RelaxorPb(Mg1/3Nb2/3)O3: A Ferroelectric with M

Abstract

Despite intensive studies on Pb(Mg(1/3)Nb(2/3))O(3) (PMN) relaxor, understanding the exact nature of its giant dielectric response and of its physical ground state is a fundamental issue that has remained unresolved for decades. Here, we report a comprehensive study of PMN relaxor crystal, and show that (i) its anomalous dielectric behavior in a broad temperature range results from the reorientation of polarization in the crystal, and (ii) the PMN relaxor is essentially a nanosized ferroelectric material with multiscale inhomogeneities of domain structure in addition to the well-known inhomogeneities of chemical composition and local symmetry. Such inhomogeneities are believed to play a crucial role in producing the huge and enigmatic physical effects in relaxor system, and may be used to design other new systems with giant effects such as a relaxor system.

Structural state of relaxor ferroelectrics PbSc0.5Ta0.5O3and PbS

“…Hence they play an important role in a number of technological applications 2 and have challenged the scientific community over the past decades to better understand the atomistic origin of their unique properties. Although the proper theoretical approach is still controversial, [3][4][5][6][7][8] it is experimentally established that their properties are related to their structural complexity on the mesoscopic scale, 1,9,10 i.e., dynamic polar nanoregions (PNRs) embedded in a nonpolar matrix, that flip between different orientation states on the microsecond time scale. 11 These dynamic PNRs nucleate by coupling of randomly offcentered cation shifts 12 at the Burns temperature T B , 13 which is several hundred kelvins above the frequency-dependent temperature of the dielectric permittivity maximum T m .…”

Nanoscale phase quantification in lead-free(Bi1/2Na1/2)TiO3−BaTiOGroszewicz1, Breitzke2, Dittmer3 et al. 2014Phys. Rev. B581340View full textAdd to dashboardCite

“…These nanodomains are kept small under the constraint of quenched random electric fields which originate from chemical disorder [7,14]. The other model introduced the concept of "polar nanoregions" (PNRs) [13].…”

Ferroelectricity in Silver Perovskite Oxides

“…PE and FE denote paraelectric and ferroelectric states, respectively. The gray zone may be a dipolar-glass state (Pirc & Blinc, 1999) or a state with nanosized ferroelectric domains (Fisch, 2003;Fu et al, 2009b).…”

“…On the basis of the above results, a phase diagram is proposed in Fig.31, in which PE and FE represents the paraelectric and ferroelectric phases, respectively. As mentioned above, since the peak of the dielectric constant is strongly dependent with frequency for 0<x<0.035, the gray zone in the phase diagram may be attributed to dipole-glass phase (Vugmeister & Glinchuk, 1990;Pirc & Blinc, 1999;Samara, 2003) or a phase with nanosized ferroelectric domains (Fisch, 2003;Fu et al, 2009b), which remains to be addressed by further investigations.…”