Recent progress in relaxor ferroelectrics with perovskite structure

Development of nanoscale polarization fluctuations in relaxor-based (1-x)Pb(Zn1/3Nb2/Tsukada1, Hidaka2, Kojima3 et al. 2013Phys. Rev. B252250View full textAdd to dashboardCite

“…[17][18][19][20]22,[31][32][33] We attribute the anomaly to a piezoelectric coupling inside the noncentrosymmetric disordered regions. Because the local structure inside the PNRs is noncentrosymmetric, 3,12,13 even though the matrix around the PNR is centrosymmetric, the polarization fluctuation can couple linearly with the strain fluctuation. On the assumption of the existence of piezoelectric coupling, we determine the relaxation time of the polarization in Sec.…”

“…2 In the case of relaxor ferroelectrics, local polar regions of several nanometers wide, called polar nanoregions (PNRs), are believed to contribute to giant dielectric and electromechanical responses. 3 These properties find a wide range of technological applications; however, their microscopic mechanisms, especially the effects of inhomogeneity on macroscopic phenomena, such as the ferroelectric phase transition in relaxor ferroelectrics, remain poorly understood.…”

“…Since PNRs are directly responsible for the various properties, the study of the dynamics of PNRs is essential for a better understanding of the intricate phase transitions in relaxor ferroelectrics. 3 The phase transitions and PNR behavior in relaxor ferroelectrics can be described using four characteristic temperatures. From the highest to the lowest, these are (i) the Burns temperature T B , 5 (ii) the intermediate temperature T * , [6][7][8] (iii) the frequency-dependent temperature of the dielectric permittivity peak T m , and (iv) the ferroelectric phase transition temperature T C [or the freezing temperature T f in the case in which this transition is absent as, e.g., in Pb(Mg 1/3 Nb 2/3 )O 3 (PMN)].…”

Stress-induced strain glass to martensite (R) transition in a Ti50Ni44.5Zhang1, Wang2, Ding3 et al. 2011Phys. Rev. B281190View full textAdd to dashboardCite

“…Very recently, it was found that the binary Ti-Ni STG exhibit a new shape memory effect and superelasticity, which is originated from a stress-induced transition from STG (with R-like local order) to a long-range strain ordered phase, B19' (monoclinic) martensite 11 . It shares the same physical origin as the field-induced transition in relaxor, whereas the order parameter is polarization [16][17][18] . 3 For binary Ti-Ni STG, although it is conceivable that a local order can be changed into a long-range order by stress, it remains a puzzle why the R-like local order does not transform into an R-phase (with the same strain order), and why it changes into a B19' martensite (with different strain order).…”

Neutron and x-ray diffraction study of cubic [111] field-cooledPb(Mg1∕3Nb2∕3)Stock1, Xu2, Gehring3 et al. 2007Phys. Rev. B603462View full textAdd to dashboardCite

“…[1][2][3][4] Pb͑Zn 1/3 Nb 2/3 ͒O 3 ͑PZN͒ and Pb͑Mg 1/3 Nb 2/3 ͒O 3 ͑PMN͒ are prototypical relaxors which, under zero field cooling, show a broad and frequency dependent peak in the dielectric constant but no well defined structural transition. The broad anomaly of the dielectric response is reflected in the phonon spectra where a soft transverse optic mode softens and then recovers with decreasing temperature.…”