Evolution of dielectric properties in the (1−x) PbFe0.5Nb0.5O3–xBaFe0.5Nb0.5O3 solid solution system

Raevski, I. P.; Титов, В. В.; Chen, Haydn; Zakharchenko, I. N.; Raevskaya, S. I.; Shevtsova, S. I.

doi:10.1007/s10853-019-03669-4

Cited by 10 publications

(5 citation statements)

References 67 publications

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“…Феррониобат свинца PbFe 0.5 Nb 0.5 O 3 (PFN) представляет собой тройной перовскит -мультиферроик, обладающий одновременно сегнетоэлектрическими и магнитными свойствами [1,2], а его твердые растворы являются перспективной основой для диэлектрических, пьезоэлектрических, пироэлектрических и магнитоэлектрических материалов [3][4][5][6][7][8][9]. Свойства тройных перовскитов PbB ′ 0.5 B ′′ 0.5 O 3 , (B ′ -In, Sc, Yb; B ′′ -Nb, Ta), к которым относится PFN, очень сильно зависят от степени упорядочения катионов B ′ и B ′′ .…”

Section: Introductionunclassified

“…Однако размытие максимума χ(T ) в керамике PFN с низкой проводимостью очень малó, а зависимость T max ( f ) практически отсутствует. Кроме того, в отличие от классических сегнетоэлектриков-релаксоров, в PFN наблюдаются два макроскопических структурных ФП: первый -между фазами параэлектрической кубической (фаза С, Pm 3m, O 1 h ) и сегнетоэлектрической тетрагональной (фаза Т, P4mm, C 1 4v ) при T ≈ 376 K, и второй -между сегнетоэлектрическими фазами тетрагональной и моноклинной (фаза М, Cm, С 3 s ) при T ≈ 356 K [15,16]. Эти данные, а также результаты исследования диэлектрических свойств монокристаллов PFN [18] позволяют считать, что PFN является не релаксором, а обычным сегнетоэлектриком, а часто наблюдаемые релаксороподобные диэлектрические свойства обусловлены влиянием дефектов или примесей.…”

Section: Introductionunclassified

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Формирование фазовых состояний PbFe-=SUB=-0.5-=/SUB=-Nb-=SUB=-0.5-=/SUB=-O-=SUB=-3-=/SUB=-: описание на основе многоминимумных моделей

Ивлиев¹,

Раевская²,

Титов³

et al. 2022

Физика Твердого Тела

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Two ferroelectric phase transitions are observed in the PbFe0.5Nb0.5O3 crystal. The first is between the cubic and tetragonal phase, the second is between the tetragonal and monoclinic phases. To describe phase transitions and emerging phases, a statistical model is proposed, based on the composition of two multi-minimum models - a six-minima model for the Pb cation and an eight-minima model for the Nb cation. Adjusting the model parameters, makes it possible to reproduce all the characteristic features of the thermodynamic behavior of the crystal. The most interesting is the formation of a ferroelectric, complexly ordered monoclinic phase with Cm symmetry. It is shown that the mentioned monoclinic phase arises due to the fact that the first-order phase transition to the rhombohedral ferroelectric phase occurs in the presence of an "external field" of tetragonal symmetry. The contribution of the subsystems of Pb and Nb cations to the features of the dielectric and structural properties of the crystal is estimated.

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Section: Introductionunclassified

Формирование фазовых состояний PbFe-=SUB=-0.5-=/SUB=-Nb-=SUB=-0.5-=/SUB=-O-=SUB=-3-=/SUB=-: описание на основе многоминимумных моделей

Ивлиев¹,

Раевская²,

Титов³

et al. 2022

Физика Твердого Тела

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“…Lead ferroniobate PbFe 0.5 Nb 0.5 O 3 (PFN) is a triple perovskitea multiferroic having both ferroelectric and magnetic properties [1,2], and its solid solutions are a promising basis for dielectric, piezoelectric, pyroelectric and magnetoelectric materials [3][4][5][6][7][8][9]. Properties of triple perovskites PbB ′ 0.5 B ′′ 0.5 O 3 , (B ′ -In, Sc, Yb; B ′′ -Nb, Ta) to which PFN belongs, very strongly depend on the degree of ordering of the cations B ′ and B ′′ .…”

Section: Introductionmentioning

confidence: 99%

Formation of phase states in PbFe-=SUB=-0.5-=/SUB=-Nb-=SUB=-0.5-=/SUB=-O-=SUB=-3-=/SUB=-: Description based on multiminima models

Ivliev

Raevskaya

Титов

et al. 2022

Physics of the Solid State

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Two ferroelectric phase transitions are observed in the PbFe0.5Nb0.5O3 crystal. The first is between the cubic and tetragonal phase, the second is between the tetragonal and monoclinic phases. To describe phase transitions and emerging phases, a statistical model is proposed, based on the composition of two multi-minimum models --- a six-minima model for the Pb cation and an eight-minima model for the Nb cation. Adjusting the model parameters, makes it possible to reproduce all the characteristic features of the thermodynamic behavior of the crystal. The most interesting is the formation of a ferroelectric, complexly ordered monoclinic phase with Cm symmetry. It is shown that the mentioned monoclinic phase arises due to the fact that the first-order phase transition to the rhombohedral ferroelectric phase occurs in the presence of an "external field" of tetragonal symmetry. The contribution of the subsystems of Pb and Nb cations to the features of the dielectric and structural properties of the crystal is estimated. Keywords: ferroelectric relaxors, phase transitions, multiminima models, ferroelectric monoclinic phase.

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“…These high dielectric constants are influenced by both extrinsic as well as intrinsic factors [16]. In order to improve the dielectric properties of the BFN materials, different technologies for obtaining ceramics are used [17][18][19][20][21][22][23][24][25], or modifiers are introduced into the base compound [26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Mechanochemical Activation and Spark Plasma Sintering of the Lead-Free Ba(Fe1/2Nb1/2)O3 Ceramics

et al. 2021

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This paper investigates the impact of the technological process (Mechanochemical Activation (MA) of the powder in combination with the Spark Plasma Sintering (SPS) method) on the final properties of lead-free Ba(Fe1/2Nb1/2)O3 (BFN) ceramic materials. The BFN powders were obtained for different MA duration times (x from 10 to 100 h). The mechanically activated BFN powders were used in the technological process of the BFN ceramics by the SPS method. The measurements of the BFNxMA ceramic samples included the following analysis: Scanning Electron Microscopy (SEM), Energy Dispersive Spectrometry (EDS), DC electrical conductivity, and dielectric properties. X-ray diffractions (XRD) tests showed the appearance of the perovskite phase of BFN powders after 10 h of milling time. The longer milling time (up 20 h) causes the amount of the perovskite phase to gradually increase, and the diffraction peaks are more clearly visible. Short high energy milling times favor a large heterogeneity of the grain shape and size. Increasing the MA milling time to 40 h significantly improves the microstructure of BFN ceramics sintered in the SPS technology. The microstructure becomes fine-grained with clearly visible grain boundaries and higher grain size uniformity. Temperature measurements of the BFN ceramics show a number of interesting dielectric properties, i.e., high values of electric permittivity, relaxation properties with a diffusion phase transition, as well as negative values of dielectric properties occurring at high temperatures. The high electric permittivity values predestines the BFNxMA materials for energy storage applications e.g., high energy density batteries, while the negative values of dielectric properties can be used for shield elements against the electromagnetic radiation.

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Evolution of dielectric properties in the (1−x) PbFe0.5Nb0.5O3–xBaFe0.5Nb0.5O3 solid solution system

Cited by 10 publications

References 67 publications

Формирование фазовых состояний PbFe-=SUB=-0.5-=/SUB=-Nb-=SUB=-0.5-=/SUB=-O-=SUB=-3-=/SUB=-: описание на основе многоминимумных моделей

Формирование фазовых состояний PbFe-=SUB=-0.5-=/SUB=-Nb-=SUB=-0.5-=/SUB=-O-=SUB=-3-=/SUB=-: описание на основе многоминимумных моделей

Formation of phase states in PbFe-=SUB=-0.5-=/SUB=-Nb-=SUB=-0.5-=/SUB=-O-=SUB=-3-=/SUB=-: Description based on multiminima models

Mechanochemical Activation and Spark Plasma Sintering of the Lead-Free Ba(Fe1/2Nb1/2)O3 Ceramics

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