Heat capacity of the PbFe1/2Ta1/2O3 perovskite-like compound

Горев, М. В.; Flerov, I. N.; Бондарев, В. С.; Sciau, Ph.; Lehmann, Alessandra Geddo

doi:10.1134/1.1687872

Cited by 11 publications

(12 citation statements)

References 14 publications

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“…Figure 2 shows the temperature dependence of the dielectric constant of the PFT and 0.8PFT-0.2PT ceramics ]. The phase transition shows a broad dielectric constant maximum peak, which agrees with the previous results [10]. Previously, the PFT was known to the relaxor ferroelectrics [11], which was related to the disordered state of Fe and Ta ions in the B-site cation.…”

Section: Resultssupporting

confidence: 82%

Dielectric, ferroelectric and ferromagnetic properties of 0.8PbFe0.5Ta0.5O3-0.2PbTiO3 ceramics

Cho

Jang

2006

J Electroceram

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Lead based complex compounds, 0.8PbFe 0.5 − Ta 0.5 O 3 -0.2PbTiO 3 (0.8PFT-0.2PT) ceramics, were prepared by the solid state reaction method, and the corresponding dielectric, ferroelectric and ferromagnetic properties were investigated. As the PT phase was added to the PFT phase, the Curie temperature of 0.8PFT-0.2PT ceramics increased. The ferroelectric P-E and ferromagnetic M-H hysteresis loops were observed at the same time. The ferroelectric properties depend on the formation of the perovskite 0.8PFT-0.2PT phase; however, the ferromagnetic properties depend on the formation of the pyrochlore Pb 3 FeTaO 7 phase.

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Section: Resultssupporting

confidence: 82%

Dielectric, ferroelectric and ferromagnetic properties of 0.8PbFe0.5Ta0.5O3-0.2PbTiO3 ceramics

Cho

Jang

2006

J Electroceram

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“…It was proposed, that the so-called Burns temperature T B characterizing the appearance of polar regions in the paraelectric matrix of relaxor ferroelectrics [15] is around 350 K in PFT. Besides, heat capacity data show two specific temperatures T m ≈ 243 K and T s ≈ 200 K identical to those of dielectric data, as well [12,13].…”

Section: Introductionmentioning

confidence: 59%

“…3). This temperature is very close to the temperature of the heat capacity anomaly at about 350 K attributed also to Burns temperature [13]. So, one can conclude that transformation from the paraelectric phase to the relaxor ferroelectric state onsets at 350-370 K.…”

Section: Acoustic Properties Of Pft Ceramicsmentioning

confidence: 66%

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Acoustic properties of multiferroic PbFe1/2Ta1/2O3

Smirnova¹,

Сотников

Зайцева³

et al. 2010

Physics Letters A

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“…There is a broad excess in the heat capacity between ~230 and ~330 K [42, 44, 45] that, by analogy with PMN [46], is expected for diffuse, relaxor behaviour. There is a small excess heat capacity associated with the transition at ~205 K, but it appears that this is not driven by a change in ferroelectric polarisation.…”

Section: Pftmentioning

confidence: 99%

Elastic and anelastic relaxation behaviour of perovskite multiferroics II: PbZr0.53Ti0.47O3 (PZT)–PbFe0.5Ta0.5O3 (PFT)

et al. 2016

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Elastic and anelastic properties of ceramic samples of multiferroic perovskites with nominal compositions across the binary join PbZr0.53Ti0.47O3–PbFe0.5Ta0.5O3 (PZT–PFT) have been assembled to create a binary phase diagram and to address the role of strain relaxation associated with their phase transitions. Structural relationships are similar to those observed previously for PbZr0.53Ti0.47O3–PbFe0.5Nb0.5O3 (PZT–PFN), but the magnitude of the tetragonal shear strain associated with the ferroelectric order parameter appears to be much smaller. This leads to relaxor character for the development of ferroelectric properties in the end member PbFe0.5Ta0.5O3. As for PZT–PFN, there appear to be two discrete instabilities rather than simply a reorientation of the electric dipole in the transition sequence cubic–tetragonal–monoclinic, and the second transition has characteristics typical of an improper ferroelastic. At intermediate compositions, the ferroelastic microstructure has strain heterogeneities on a mesoscopic length scale and, probably, also on a microscopic scale. This results in a wide anelastic freezing interval for strain-related defects rather than the freezing of discrete twin walls that would occur in a conventional ferroelastic material. In PFT, however, the acoustic loss behaviour more nearly resembles that due to freezing of conventional ferroelastic twin walls. Precursor softening of the shear modulus in both PFT and PFN does not fit with a Vogel–Fulcher description, but in PFT there is a temperature interval where the softening conforms to a power law suggestive of the role of fluctuations of the order parameter with dispersion along one branch of the Brillouin zone. Magnetic ordering appears to be coupled only weakly with a volume strain and not with shear strain but, as with multiferroic PZT–PFN perovskites, takes place within crystals which have significant strain heterogeneities on different length scales.

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Heat capacity of the PbFe1/2Ta1/2O3 perovskite-like compound

Cited by 11 publications

References 14 publications

Dielectric, ferroelectric and ferromagnetic properties of 0.8PbFe0.5Ta0.5O3-0.2PbTiO3 ceramics

Dielectric, ferroelectric and ferromagnetic properties of 0.8PbFe0.5Ta0.5O3-0.2PbTiO3 ceramics

Acoustic properties of multiferroic PbFe1/2Ta1/2O3

Elastic and anelastic relaxation behaviour of perovskite multiferroics II: PbZr0.53Ti0.47O3 (PZT)–PbFe0.5Ta0.5O3 (PFT)

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