Incommensurate crystal structure of PbHfO<sub>3</sub>

Bosak, Alexeï; Svitlyk, Volodymyr; Arakcheeva, A. V.; Burkovsky, R. G.; Diadkin, Vadim; Roleder, Krystian; Chernyshov, Dmitry

doi:10.1107/s205252061901494x

Cited by 34 publications

(46 citation statements)

References 22 publications

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“…97 It was recently reported that this system also has an INC structural transition (Figure 12B,C). 112 Niobate perovskites such as NaNbO 3 and AgNbO 3 have multiple octahedral tilt transitions. Near room temperature, there is an AFE phase that has the orthorhombic space group Pbcm, with the antipolar distortions coming from the Nb-O bonds.…”

Section: Perovskite Structure and Afementioning

confidence: 99%

“…[96]). (B,C) Representation of the incommensurate modulations in the structure of PbHfO 3 , after Bosak et al 112 (B) The Pb atoms (shown as dark circles) are modulated predominantly in the [110] of the cubic prototype group. (C) the structure also has an octahedral tilt [Color figure can be viewed at wileyonlinelibrary.com]…”

Section: Crystal Structures and Crystallography Of Afesmentioning

confidence: 99%

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Antiferroelectrics: History, fundamentals, crystal chemistry, crystal structures, size effects, and applications

et al. 2021

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Antiferroelectric (AFE) materials are of great interest owing to their scientific richness and their utility in high-energy density capacitors. Here, the history of AFEs is reviewed, and the characteristics of antiferroelectricity and the phase transition of an AFE material are described. AFEs are energetically close to ferroelectric (FE) phases, and thus both the electric field strength and applied stress (pressure) influence the nature of the transition. With the comparable energetics between the AFE and FE phases, there can be a competition and frustration of these phases, and either incommensurate and/or a glassy (relaxor) structures may be observed. The phase transition in AFEs can also be influenced by the crystal/grain size, particularly at nanometric dimensions, and may be tuned through the formation of solid solutions. There have been extensive studies on the perovskite family of AFE materials, but many other crystal structures host AFE behavior, such as CuBiP 2 Se 6 . AFE applications include DC-link capacitors for power electronics, defibrillator capacitors, pulse power devices, and electromechanical actuators. The paper concludes with a perspective on the future needs and opportunities with respect to discovery, science, and applications of AFE. K E Y W O R D S applications, dielectric materials/properties, ferroelectricity/ferroelectric materials, phase transition F I G U R E 3 Antiferroelectric double hysteresis loops in (A) Pb(Lu 0.5 Nb 0.5 )O 3 and (B) the temperature-dependent critical field in it (replotted from Ref. [30]). (C) shows the phase diagram of PbZrO 3 as a function of temperature and electrical field (replotted from Ref.

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Section: Perovskite Structure and Afementioning

confidence: 99%

Section: Crystal Structures and Crystallography Of Afesmentioning

confidence: 99%

Antiferroelectrics: History, fundamentals, crystal chemistry, crystal structures, size effects, and applications

et al. 2021

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“…В монокристаллах чистого PZO СЭ-фаза существует в очень узком температурном интервале [3,4], в то время как в керамиках цирконата свинца промежуточная СЭ-фаза наблюдается в довольно широкой температурной области [5]. В зависимости от концентрации компонентов в твердых растворах и от внешних условий в соединениях группы PZO наблюдается большое разнообразие структурных состояний, включая упомянутые АСЭ и СЭ фазы [6] фазы, а также несоразмерные структуры [7,8]. Структура АСЭ-фаз хорошо изучена; обнаружено сосуществование двух параметров порядка -собственно антисегнетоэлектрического, характеризуемого волновым вектором q = (1/4 1/4 0) и антиферродисторсионного, характеризуемого волновым вектором q R = (1/2 1/2 1/2).…”

Section: Introductionunclassified

“…В работе [8] приведены результаты расшифровки несоразмерной структуры PbHfO 3 . В тоже время однозначное решение структуры СЭ-фазы PZT с x ≤ 0.06 по прежнему отсутствует несмотря на большое число работ посвященных этой проблеме [9][10][11][12].…”

Section: Introductionunclassified

Антиферродисторсионная мягкая мода в кристалле PbZr-=SUB=-0.024-=/SUB=-Ti-=SUB=-0.976-=/SUB=-O-=SUB=-3-=/SUB=-

Vakhrushev¹,

Бронвальд²,

Петрухно³

et al. 2021

Физика Твердого Тела

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The antiferrodistortive soft mode was detected at the M point of the Brillouin zone in a crystal PbZr0.024Ti0.976O3 using the method of inelastic scattering of synchrotron radiation. The performed group-theoretical analysis and calculations of inelastic structural factors made it possible to relate the detected critical excitation to oxygen octahedra rotations. The traced temperature evolution of the soft mode frequency obeys the Curie-Weiss law with Curie temperature T AFD = 438 ± 5 K, which is close to the ferroelectric Curie temperature T FE = 479.5 K.

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“…473 K. Several publications were devoted to establishing the proper structure of this phase. [16][17][18] Based on the latest findings, the symmetry of this phase was established to be orthorhombic, with IC modulations and with Imma(00γ)s00 super-space group. 18 However, the problem of mechanisms responsible for the phase transitions observed is still subject to investigation.…”

Section: Introductionmentioning

confidence: 99%

The complexity of structural phase transitions in Pb(Hf_0.92Sn_0.08)O₃ single crystals

Jankowska‐Sumara

Majchrowski

2021

J. Am. Ceram. Soc.

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Pb(Hf 1−x Sn x )O 3 single crystals with x = 0.08 were characterized using single-crystal X-ray diffraction and Raman scattering, in a wide temperature range. The information concerning the structure of two intermediate phases (IMs), situated between lowtemperature antiferroelectric A1 and high-temperature paraelectric PE phases, was obtained. The lower temperature IM, A2, is characterized by incommensurate displacive modulations in the Pb sublattice. The higher temperature IM, is characterized by tilting of oxygen octahedra, and serious disorder coming from lead ions represented by X-ray diffuse scattering. Optical phonons and phase transitions in Pb(Hf 1−x Sn x ) O 3 single crystals were investigated by temperature-dependent Raman spectra. It was found that several soft modes control the phase transition between two antiferroelectric phases indicating its displacive character, whereas, in the paraelectric phase, both soft modes and Rayleigh scattering were observed.

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Incommensurate crystal structure of PbHfO₃

Cited by 34 publications

References 22 publications

Antiferroelectrics: History, fundamentals, crystal chemistry, crystal structures, size effects, and applications

Antiferroelectrics: History, fundamentals, crystal chemistry, crystal structures, size effects, and applications

Антиферродисторсионная мягкая мода в кристалле PbZr-=SUB=-0.024-=/SUB=-Ti-=SUB=-0.976-=/SUB=-O-=SUB=-3-=/SUB=-

The complexity of structural phase transitions in Pb(Hf_0.92Sn_0.08)O₃ single crystals

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Incommensurate crystal structure of PbHfO3

Cited by 34 publications

References 22 publications

Antiferroelectrics: History, fundamentals, crystal chemistry, crystal structures, size effects, and applications

Antiferroelectrics: History, fundamentals, crystal chemistry, crystal structures, size effects, and applications

Антиферродисторсионная мягкая мода в кристалле PbZr-=SUB=-0.024-=/SUB=-Ti-=SUB=-0.976-=/SUB=-O-=SUB=-3-=/SUB=-

The complexity of structural phase transitions in Pb(Hf0.92Sn0.08)O3 single crystals

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Incommensurate crystal structure of PbHfO₃

The complexity of structural phase transitions in Pb(Hf_0.92Sn_0.08)O₃ single crystals