Electric properties in the range of ferroelectric phase transitions in Pb(Fe0.5Nb0.5)O3crystals and ceramics

Rayevsky, I. P.; Bokov, Alexei A.; Bogatin, A. S.; Emelyanov, Slava; Malitskaya, M. A.; Prokopalo, O. I.

doi:10.1080/00150199208227058

Cited by 27 publications

(4 citation statements)

References 5 publications

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“…one can suppose that dielectric response observed for li-doped pFn ceramics is the intrinsic one. This supposition is confirmed by the fact that the anomaly of ε′(T) at ≈80°c corresponding to the transition between rhombohedral (monoclinic [11]) and tetragonal ferroelectric phases reported for pFn single crystals [12], [14] is observed in highly resistive ceramic samples too [ Fig. 2(b)], whereas it is not seen in conductive ceramics [4], [10] [ Fig.…”

Section: Resultssupporting

confidence: 64%

“…Electric conductivity of undoped pFn ceramics depends dramatically on the sintering temperature [5], [6], and fabrication of pFn-based ceramics with low conductivity is a difficult task [5]- [11]. because of high conductivity of the usually studied undoped pFn ceramics, the intrinsic dielectric response is obscured by the maxwellWagner relaxation and/or the relaxation related to oxygen defects [5], [11], [12] [ Fig. 2(a)].…”

Section: Resultsmentioning

confidence: 99%

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Dielectric and Mossbauer studies of ferroelectric and magnetic phase transitions in a-site and b-site substituted multiferroic PbFe_0.5Nb_0.5O₃

Raevski

Кубрин

Raevskaya

et al. 2012

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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In the present study, we diluted either A- or B- sublattice of perovskite multiferroic PbFe(0.5)Nb(0.5)O(3) (PFN) and studied the changes of the magnetic and ferroelectric phase transition temperatures and dielectric properties caused by such dilution. Dielectric studies of PFN single crystals show that, in contrast to the commonly adopted view, the ferroelectric phase transition in PFN is non-diffused and the relaxor-like behavior usually observed in ceramic samples has an extrinsic nature. A-site substitutions (Ba, Ca) lead to the smearing of the permittivity-temperature maximum, lowering its maximum temperature, T(m) and inducing relaxor behavior. B-site diluting of PFN by Ti increases T(m) and only slightly affects the permittivity maximum diffuseness. Both A-site and B-site substitutions in PFN lead to lowering of its Neel temperature, T(N). However, above a certain compositional threshold, fast lowering of T(N) stops and a new magnetic state with comparatively high (~50K) transition temperature becomes stable in a rather wide compositional range.

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Section: Resultssupporting

confidence: 64%

Section: Resultsmentioning

confidence: 99%

Dielectric and Mossbauer studies of ferroelectric and magnetic phase transitions in a-site and b-site substituted multiferroic PbFe_0.5Nb_0.5O₃

Raevski

Кубрин

Raevskaya

et al. 2012

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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“…* T , the temperature below which PNRs start to acquire some static component, has been most recently placed at ~430 K for a bulk sample [12] and ~510 K for a thin film [49]. The second transition, ~20-40 K below T c , generally seems to have no influence on the temperature dependence of the dielectric permittivity [32,34,37,45,50,55,57,58,63,64,67,75], but is sometimes seen as an shoulder on the main peak [65,76]. Mabud [16] only found evidence for a single transition in powder x-ray diffraction patterns collected between room temperature and 423 K.…”

Section: Introductionmentioning

confidence: 99%

Elastic and magnetoelastic relaxation behaviour of multiferroic (ferromagnetic + ferroelectric + ferroelastic) Pb(Fe_0.5Nb_0.5)O₃perovskite

Carpenter

Schiemer

Lascu

et al. 2015

J. Phys.: Condens. Matter

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Resonant Ultrasound Spectroscopy has been used to characterize elastic and anelastic anomalies in a polycrystalline sample of multiferroic Pb(Fe(0.5)Nb(0.5))O(3) (PFN). Elastic softening begins at ~550 K, which is close to the Burns temperature marking the development of dynamical polar nanoregions. A small increase in acoustic loss at ~425 K coincides with the value of T(*) reported for polar nanoregions starting to acquire a static or quasi-static component. Softening of the shear modulus by ~30-35% through ~395-320 K, together with a peak in acoustic loss, is due to classical strain/order parameter coupling through the cubic → tetragonal → monoclinic transition sequence of ferroelectric/ferroelastic transitions. A plateau of high acoustic loss below ~320 K is due to the mobility under stress of a ferroelastic microstructure but, instead of the typical effects of freezing of twin wall motion at some low temperature, there is a steady decrease in loss and increase in elastic stiffness below ~85 K. This is attributed to freezing of a succession of strain-coupled defects with a range of relaxation times and is consistent with a report in the literature that PFN develops a tweed microstructure over a wide temperature interval. No overt anomaly was observed near the expected Néel point, ~145 K, consistent with weak/absent spin/lattice coupling but heat capacity measurements showed that the antiferromagnetic transition is actually smeared out or suppressed. Instead, the sample is weakly ferromagnetic up to ~560 K, though it has not been possible to exclude definitively the possibility that this could be due to some magnetic impurity. Overall, evidence from the RUS data is of a permeating influence of static and dynamic strain relaxation effects which are attributed to local strain heterogeneity on a mesoscopic length scale. These, in turn, must have a role in determining the magnetic properties and multiferroic character of PFN.

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“…It is currently of interest as a component in commercial electroceramic materials, particularly as it is typically characterized by high relative permittivities and low sintering temperatures. Although the structural, dielectric and many other properties of PFN (Ivanov et al (2000), Lampis et al (1999), Bonny et al (1997), Schmid (1994), Bokov et al (1993), Yokosuka (1993), Lemanov et al (1992), Rayevsky et al (1992), Darlington (1991), Ueda (1989a, 1989b), Mabud (1984) and references therein) have been extensively examined, no attempt has been made to study the similar system BaFe 0.5 Nb 0.5 O 3 (BFN) to our knowledge. In the present work, a dielectric study of BFN ceramic prepared by the solid-state reaction technique is presented for the first time.…”

Section: Introductionmentioning

confidence: 99%

Structural and dielectric studies of BaFe_0.5Nb_0.5O₃

Saha

Sinha

2001

J. Phys.: Condens. Matter

155

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Ferroelectric BaFe 0.5 Nb 0.5 O 3 (BFN) ceramic is synthesized by the solid-state reaction technique for the first time. The x-ray diffraction of the sample at room temperature shows a monoclinic phase. Dielectric studies of the sample show a frequency dependence of the temperatures at which the dielectric permittivity (real and imaginary) peaks. The temperature variations of the real and imaginary components of the dielectric permittivity show broad maxima. There is evidence for Vogel-Fulcher-type relaxational freezing. The analysis of the real and imaginary parts of the dielectric permittivity with frequency has been performed assuming a distribution of relaxation times as confirmed by Cole-Cole plots as well as the scaling behaviour of the dielectric loss. All these observations clearly suggest that BFN is a relaxor ferroelectric. The Mössbauer spectrum of the sample at room temperature shows a symmetric doublet, with the iron being trivalent.

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Electric properties in the range of ferroelectric phase transitions in Pb(Fe_0.5Nb_0.5)O₃crystals and ceramics

Cited by 27 publications

References 5 publications

Dielectric and Mossbauer studies of ferroelectric and magnetic phase transitions in a-site and b-site substituted multiferroic PbFe_0.5Nb_0.5O₃

Dielectric and Mossbauer studies of ferroelectric and magnetic phase transitions in a-site and b-site substituted multiferroic PbFe_0.5Nb_0.5O₃

Elastic and magnetoelastic relaxation behaviour of multiferroic (ferromagnetic + ferroelectric + ferroelastic) Pb(Fe_0.5Nb_0.5)O₃perovskite

Structural and dielectric studies of BaFe_0.5Nb_0.5O₃

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Electric properties in the range of ferroelectric phase transitions in Pb(Fe0.5Nb0.5)O3crystals and ceramics

Cited by 27 publications

References 5 publications

Dielectric and Mossbauer studies of ferroelectric and magnetic phase transitions in a-site and b-site substituted multiferroic PbFe0.5Nb0.5O3

Dielectric and Mossbauer studies of ferroelectric and magnetic phase transitions in a-site and b-site substituted multiferroic PbFe0.5Nb0.5O3

Elastic and magnetoelastic relaxation behaviour of multiferroic (ferromagnetic + ferroelectric + ferroelastic) Pb(Fe0.5Nb0.5)O3perovskite

Structural and dielectric studies of BaFe0.5Nb0.5O3

Contact Info

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Electric properties in the range of ferroelectric phase transitions in Pb(Fe_0.5Nb_0.5)O₃crystals and ceramics

Dielectric and Mossbauer studies of ferroelectric and magnetic phase transitions in a-site and b-site substituted multiferroic PbFe_0.5Nb_0.5O₃

Dielectric and Mossbauer studies of ferroelectric and magnetic phase transitions in a-site and b-site substituted multiferroic PbFe_0.5Nb_0.5O₃

Elastic and magnetoelastic relaxation behaviour of multiferroic (ferromagnetic + ferroelectric + ferroelastic) Pb(Fe_0.5Nb_0.5)O₃perovskite

Structural and dielectric studies of BaFe_0.5Nb_0.5O₃