Structural Peculiarities of the Intermediate Phase in Zr-Rich Lead Zirconate Titanate

Andronikova, Daria; Bronwald, Iurii; Leontyev, N. G.; Leontyev, Igor N.; Chernyshov, Dmitry; Filimonov, A. V.; Vakhrushev, Sergey

doi:10.1134/s1063783419100056

Cited by 7 publications

(8 citation statements)

References 21 publications

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“…Если полагать, что переход из параэлектрической (ПЭ) в СЭ-фазу является собственным сегнетоэлектрическим -то первичным параметром порядка следует считать поляризацию. Однако в СЭ-фазе возникают сверхструктурные отражения в M-точке зоны Бриллюэна (ЗБ) и дополнительные сателлитные отражения [13,14]. Возникающая М-сверхструктура не может быть соотнесена с антиферродисторсионным (АФД) параметром порядка (ПП), связанным с параллельными разворотами кислородных октаэдров в соседних плоскостях, поскольку отсутствует специфический для такого ПП закон погасания [10].…”

Section: Introductionunclassified

“…Возникающая М-сверхструктура не может быть соотнесена с антиферродисторсионным (АФД) параметром порядка (ПП), связанным с параллельными разворотами кислородных октаэдров в соседних плоскостях, поскольку отсутствует специфический для такого ПП закон погасания [10]. Более того, как было показано в работе [14] возникающий сложный набор сателлитных отражений не укладывается в предлагавшуюся в статьях [10,15] картину антифазных доменов. Одним из наиболее эффективных путей поиска ответа на вопрос о формировании структуры СЭ-фазы является прослеживание релевантной критической динамики.…”

Section: Introductionunclassified

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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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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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“…If we assume that the transition from the paraelectric (PE) to the FE phase is intrinsic ferroelectric, then polarization will be the primary order parameter. However, it has been shown that in the FE phase superstructure reflexes occur at the M point of the Brillouin zone (BZ)

, and additional satellite reflexes occur near it [ 13 , 14 , 15 ]. The arising M-superstructure cannot be correlated with the antiferrodistortive (AFD) order parameter (OP) associated with parallel rotations of oxygen octahedra in neighboring planes since there is no

extinction law specific for such an OP [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

“…Lattice dynamics of the antiferroelectric and ferroelectric materials of the PZO group were studied both experimentally [ 11 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 ] and theoretically [ 26 , 27 , 28 , 29 , 30 ]. In addition to the direct measurements of the phonon spectra using the optical spectroscopy and inelastic X-ray scattering (IXS) complementary diffuse scattering (DS) studies were done [ 14 , 31 , 32 , 33 , 34 ] The main attention was paid to the dynamic origin of the AFE phase and the details of the phonon dispersion around the

-point (

) and the R-point (

).…”

Section: Introductionmentioning

confidence: 99%

“…In the later neutron DS experiment [ 32 ] no asymmetry in the distribution of the scattering intensity was reported. Temperature evolution of the X-ray DS intensity in the cubic phase of the PZT0.7 was traced by Andronikova et al [ 14 ]. It was found that the peak near the M-point grows fast on approaching the transition to the FE phase.…”

Section: Introductionmentioning

confidence: 99%

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Mode Coupling at around M-Point in PZT

et al. 2021

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The question of the microscopic origin of the M-superstructure and additional satellite peaks in the Zr-rich lead zirconate-titanate is discussed for nearly 50 years. Clear contradiction between the selection rules of the critical scattering and the superstructure was found preventing unambiguous attributing of the observed superstructure either to the rotation of the oxygen octahedra or to the antiparallel displacements of the lead cations. Detailed analysis of the satellite pattern explained it as the result of the incommensurate phase transition rather than antiphase domains. Critical dynamics is the key point for the formulated problems. Recently, the oxygen tilt soft mode in the PbZr0.976Ti0.024O3 (PZT2.4) was found. But this does not resolve the extinction rules contradiction. The results of the inelastic X-ray scattering study of the phonon spectra of PZT2.4 around M-point are reported. Strong coupling between the lead and oxygen modes resulting in mode anticrossing and creation of the wide flat part in the lowest phonon dispersion curves is identified. This flat part corresponds to the mixture of the displacements of the lead and oxygen ions and can be an explanation of the extinction rules contradiction. Moreover, a flat dispersion surface is a typical prerequisite for the incommensurate phase transition.

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Ferroelastic domain hierarchy in the intermediate state of PbZr0.98Ti0.02O3 single crystal

Xie

Zhang

et al. 2021

APL Materials

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PbZrO3-based antiferroelectric crystals are of great interest in both fundamental and applied research, not only because of the antiferroelectric feature at room temperature but also because of the existence of a peculiar intermediate state at elevated temperatures. Here, we report a detailed description of domain structure change at the temperature-induced antiferroelectric-to-ferroelectric phase transition. A complex process of different types of domains is revealed to appear at different stages of the phase transition. A hierarchical ferroelastic domain structure forms in the stabilized intermediate state, where the dense domain walls show potential impact on the physical properties of the crystal.

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Structural Peculiarities of the Intermediate Phase in Zr-Rich Lead Zirconate Titanate

Cited by 7 publications

References 21 publications

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

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

Mode Coupling at around M-Point in PZT

Ferroelastic domain hierarchy in the intermediate state of PbZr0.98Ti0.02O3 single crystal

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