Dielectric and Ultrasonic Investigation of Phase Transitions in PbFe1/2Nb1/2O3Ceramics

Kinka, Martynas; Samulionis, V.; Banys, J.; Калване, А.; Борманис, К.

doi:10.1080/00150193.2012.743371

Cited by 4 publications

(4 citation statements)

References 16 publications

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“…Calorimetric, birefringence, dielectric, ultrasonic, and acoustic emission studies of PFN and PFT ceramics and single crystals confirmed the presence of the M‐T‐C phase transition sequence. In addition, dielectric studies of single crystals and good quality ceramics (synthesized from mechanically activated powders and by a hot‐pressing method) undoubtedly pointed to the diffuse nature of the ferroelectric T‐C phase transition . Therefore, the grain boundary and secondary phase contributions to dielectric response seem to be the reason of the relaxor behavior revealed for the majority of PFN and PFT ceramics prepared by a conventional solid‐state reaction route …”

Section: Introductionmentioning

confidence: 76%

Characterization of multiferroic PbFe_0.5Nb_0.5O₃ and PbFe_0.5Ta_0.5O₃ ceramics derived from citrate polymeric precursors

et al. 2018

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Ceramics of the perovskite multiferroics PbFe0.5Nb0.5O3 (PFN) and PbFe0.5Ta0.5O3 (PFT) were synthesized from new citrate polymeric precursors. X‐ray tests pointed to trace amounts of the pyrochlore phase. SEM studies revealed the heterogeneous grain size distribution for PFN and the homogeneous one for PFT. Dielectric studies pointed to one diffuse T‐C phase transition at 378 K for PFN and two diffuse M‐T and T‐C phase transitions, at 200 and 235 K, for PFT, respectively. X‐ray photoelectron spectroscopy studies of PFN reveal that all ions exist in one valence state, however, with two chemical shifts for Pb2+. Two valence states for the majority of ions of PFT seem to be connected with a higher volume fraction of the amorphous grain‐boundary phase. The electronic energy band gap for both compounds is approximately 2.8 eV. Two magnetic transitions, ie, from the paramagnetic to the antiferromagnetic phase and then to the spin‐glass phase, were observed at 156 and 10 K for PFN, and at 145 and 15 K for PFT, respectively.

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Section: Introductionmentioning

confidence: 76%

Characterization of multiferroic PbFe_0.5Nb_0.5O₃ and PbFe_0.5Ta_0.5O₃ ceramics derived from citrate polymeric precursors

et al. 2018

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“…In addition to the influence on the phase diagrams, the coupling of the magnetic and electric order parameters with strain leads to the emergence of elastic anomalies at modified phase transition temperatures. The alterations in the elastic modulus can be monitored by ultrasound techniques as in [3][4][5][6][7][8][9][10]. Elastic anomalies through the phase transitions in multiferroics were discussed previously [5,7] within the framework of the Landau theory.…”

Section: Elastic Modulusmentioning

confidence: 99%

“…The alterations in the elastic modulus can be monitored by ultrasound techniques as in [3][4][5][6][7][8][9][10]. Elastic anomalies through the phase transitions in multiferroics were discussed previously [5,7] within the framework of the Landau theory.…”

Section: Elastic Modulusmentioning

confidence: 99%

“…Experimental studies of multiferroic materials showed that their properties can be remarkably influenced by interaction with strains. Such an interaction becomes apparent, for instance, in elastic anomalies through the phase transitions [3][4][5][6][7][8][9][10] and in the impact of substrate-induced or epitaxial strain on the ferroic phase transitions and orientations of magnetic moments [11][12][13]. While many efforts were made to reveal the role of strain in the multiferroic materials, some effects of coupling of the magnetic and electric order parameters with strain were still not discussed properly.…”

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Effect of coupling with strain in multiferroics on phase diagrams and elastic anomalies

Charnaya

Pirozerskiĭ

Gabbasova

et al. 2014

Physica B: Condensed Matter

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The Landau theory was applied to treat the phase diagrams for a multiferroic with two second order phase transitions taking into account the coupling of the primary order parameters with strain. Two order parameters are coupled biquadratically which corresponds to the magnetoelectric materials. The coupling with strain is assumed to be linear in strain and quadratic in order parameters. Three ordered phases are discussed. Analytic relationships were obtained for the phase transition temperatures and for elastic modulus changes through the phase transitions. Strong influence of the coupling with strain on the phase diagrams was shown. IntroductionRecently the renewed attention was focused on multiferroic materials (single-phase and composite ones) because of their promising applications as multifunctional devices (see [1,2] and references therein). The most interesting case is when two coupling order parameters are related to magnetic and electric orderings leading to the magnetoelectric effect. Experimental studies of multiferroic materials showed that their properties can be remarkably influenced by interaction with strains. Such an interaction becomes apparent, for instance, in elastic anomalies through the phase transitions [3][4][5][6][7][8][9][10] and in the impact of substrate-induced or epitaxial strain on the ferroic phase transitions and orientations of magnetic moments [11][12][13]. While many efforts were made to reveal the role of strain in the multiferroic materials, some effects of coupling of the magnetic and electric order parameters with strain were still not discussed properly.

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Lattice dynamics and broad-band dielectric properties of multiferroic Pb(Fe1/2Nb1/2)O3 ceramics

Mackeviciute

Goian

Greicius

et al. 2015

Journal of Applied Physics

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Complex dielectric properties of Pb(Fe1/2Nb1/2)O3 ceramics were investigated in a broad frequency range from 100 Hz up to 90 THz. A broad dielectric anomaly was observed near the temperature of the ferroelectric phase transition (TC1 = 376 K). Below 1 MHz, the anomaly is strongly influenced by conductivity of the sample, but higher frequency data taken up to 81 MHz reveal a broad and frequency independent peak at TC1 typical for a diffuse ferroelectric phase transition. Surprisingly, dielectric permittivity measured at 37 GHz exhibits a peak shifted by 25 K above TC1, which indicates polar nanoregions with dynamics in microwave frequency region. A dielectric relaxation, which appears in THz region below 700 K, slows down towards TC1 and again hardens below TC2 = 356 K. This central mode drives both phase transitions, so they belong to order–disorder type, although the polar phonons exhibit anomalies near both phase transitions. In the paraelectric phase, infrared reflectivity spectra correspond to local Fm3¯m structure due to short-range chemical ordering of Fe and Nb cations on the B perovskite sites. Moreover, each polar phonon is split due to two different cations on the B sites. Recently, Manley et al. [Nat. Commun. 5, 3683 (2014)] proposed a new mechanism of creation of polar nanoregions in relaxor ferroelectrics. They argued, based on their inelastic neutron scattering studies of PMN–PT, that the TO1 phonon is split and interaction of both components gives rise to so called Anderson phonon localization, which can produce regions of trapped standing waves and these waves induce polar nanoregions in relaxors. We cannot exclude or confirm this mechanism, but we show that the splitting of polar phonons is a common feature for all complex perovskites with relaxor ferroelectric behavior and it can be also observed in canonical ferroelectric BaTiO3, where the soft mode is split in paraelectric phase due to a strong lattice anharmonicity.

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Dielectric and Ultrasonic Investigation of Phase Transitions in PbFe_1/2Nb_1/2O₃Ceramics

Cited by 4 publications

References 16 publications

Characterization of multiferroic PbFe_0.5Nb_0.5O₃ and PbFe_0.5Ta_0.5O₃ ceramics derived from citrate polymeric precursors

Characterization of multiferroic PbFe_0.5Nb_0.5O₃ and PbFe_0.5Ta_0.5O₃ ceramics derived from citrate polymeric precursors

Effect of coupling with strain in multiferroics on phase diagrams and elastic anomalies

Lattice dynamics and broad-band dielectric properties of multiferroic Pb(Fe1/2Nb1/2)O3 ceramics

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Dielectric and Ultrasonic Investigation of Phase Transitions in PbFe1/2Nb1/2O3Ceramics

Cited by 4 publications

References 16 publications

Characterization of multiferroic PbFe0.5Nb0.5O3 and PbFe0.5Ta0.5O3 ceramics derived from citrate polymeric precursors

Characterization of multiferroic PbFe0.5Nb0.5O3 and PbFe0.5Ta0.5O3 ceramics derived from citrate polymeric precursors

Effect of coupling with strain in multiferroics on phase diagrams and elastic anomalies

Lattice dynamics and broad-band dielectric properties of multiferroic Pb(Fe1/2Nb1/2)O3 ceramics

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Dielectric and Ultrasonic Investigation of Phase Transitions in PbFe_1/2Nb_1/2O₃Ceramics

Characterization of multiferroic PbFe_0.5Nb_0.5O₃ and PbFe_0.5Ta_0.5O₃ ceramics derived from citrate polymeric precursors

Characterization of multiferroic PbFe_0.5Nb_0.5O₃ and PbFe_0.5Ta_0.5O₃ ceramics derived from citrate polymeric precursors