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Cordero, F.; Trequattrini, F.; Craciun, F.; Galassi, Carmen

doi:10.1103/physrevb.87.094108

Cited by 39 publications

(63 citation statements)

References 45 publications

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“…This phase boundary extrapolates to the location of the MPB at *160 K, *50 % PT [38,44,49], though extrapolation to *0 K at *50 % PT has also been shown in some phase diagrams [50,51]. Diffraction and dielectric evidence for a tilting transition at *210 K in Pb(Zr 0.52 Ti 0.48 )O 3 [52,53] is consistent with the topology given by Cordero et al [44] and calculated from first principles by Kornev et al [54]. Away from the MPB, the change in space group is R3m-R3c, for which second-order character is allowed.…”

Section: Ternary Compositionsmentioning

confidence: 74%

“…Tetragonal lattice geometry has been confirmed at room temperature for three compositions in the middle of this field [46], at three compositions along the join Pb(Zr 0. 44 Ti 0.56 )O 3 -PFN [47] and close to the ternary MPB [48].…”

Section: Ternary Compositionsmentioning

confidence: 75%

“…Additional transitions between rhombohedral phases at compositions close to the Pbam-rhombohedral phase boundary and near the 50:50 composition have been proposed [40,41], but the structures involved were not fully characterised. By analogy with the topology of the PZ-rich side of the PZ-PT phase diagram shown by Cordero et al [44], one possibility is that high temperature and lower temperature ferroelectric phases labelled by Lovkova et al [41] as FE 2 and FE 3 correspond to R3m and R3c structures, respectively. This would have the R3m-R3c transition temperature increasing from *300 K at 10 % PFN to *330 K at 20 % PFN.…”

Section: Pz-pfnmentioning

confidence: 91%

“…PFNrich compositions along the join Pb(Zr 0. 44 Ti 0.56 )O 3 -PFN were reported by Amonpattaratkit et al [47] as being cubic at room temperature but could presumably have been rhombohedral or monoclinic with only very small lattice distortions. The same applies to PFN-rich compositions along the join Pb(Zr 0.…”

Section: Ternary Compositionsmentioning

confidence: 91%

“…Prasatkhetragarn [67] claimed that a tetragonal-rhombohedral transition occurs with falling temperature at 423 K in a sample with composition [Pb(Zr 0. 44 Ti 0.56 )O 3 ] 0. 9 [PFN] 0.1 , but the reported room temperature diffraction pattern is that of the tetragonal structure and is therefore shown as such in Fig.…”

Section: Ternary Compositionsmentioning

confidence: 99%

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Elastic and anelastic relaxation behaviour of perovskite multiferroics I: PbZr0.53Ti0.47O3 (PZT)–PbFe0.5Nb0.5O3 (PFN)

et al. 2016

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Perovskites in the ternary system PbTiO 3 (PT)-PbZrO 3 (PZ)-Pb(Fe 0.5 Nb 0.5 )O 3 (PFN) have attracted close interest because they can display simultaneous ferroelectric, magnetic and ferroelastic properties. Those with the most sensitive response to external fields are likely to have compositions near the morphotropic phase boundary (MPB) which lies close to the binary join Pb(Zr 0.53 Ti 0.47 )O 3 (PZT)-PFN. In the present study, the strength and dynamics of strain coupling behaviour which accompanies the development of ferroelectricity and (anti)ferromagnetism in ceramic PZT-PFN samples have been investigated by resonant ultrasound spectroscopy. Elastic softening ahead of the cubic-tetragonal transition does not fit with models based on dispersion of the soft mode or relaxor characteristics but is attributed, instead, to coupling between acoustic modes and a central peak mode from correlated relaxations and/or microstructure dynamics. Softening of the shear modulus through the transition by up to *50 % fits with the expected pattern for linear/quadratic strain/order parameter coupling at an improper ferroelastic transition and close to tricritical evolution for the order parameter. Superattenuation of acoustic resonances in a temperature interval of *100 K below the transition point is indicative of mobile ferroelastic twin walls. By way of contrast, the first-order tetragonalmonoclinic transition involves only a small change in the shear modulus and is not accompanied by significant changes in acoustic dissipation. The dominant Address correspondence to E-mail: mc43@esc.cam.ac.uk DOI 10.1007/s10853-016-0280-2 J Mater Sci (2016) 51:10727-10760 feature of the elastic and anelastic properties at low temperatures is a concaveup variation of the shear modulus and relatively high loss down to the lowest temperature, which appears to be the signature of materials with substantial local strain heterogeneity and a spectrum of strain relaxation times. No evidence of magnetoelastic coupling has been found, in spite of the samples displaying ferromagnetism below *550 K and possible spin glass ordering below *50 K. For the important multiferroic perovskite ceramics with compositions close to the MPB of ternary PT-PZ-PFN, there must be some focus in future on the role of strain heterogeneity.

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