Polarization Rotation and Monoclinic Distortion in Ferroelectric (Bi0.5Na0.5)TiO3–BaTiO3 Single Crystals under Electric Fields

Ogino, M.; Noguchi, Yuji; Kitanaka, Yuuki; Miyayama, Masaru; Moriyoshi, Chikako; Kuroiwa, Yoshihiro

doi:10.3390/cryst4030273

Cited by 25 publications

(20 citation statements)

References 80 publications

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“…The mixture was soaked at 1,100 °C for 4 h, slowly cooled to 1,070 °C at a rate of −2 °C/h, and then cooled to room temperature. The details of the crystal growth are described in refs 34, 35, 36. We confirmed the chemical composition of BNT–7%BT via X-ray fluorescence and inductively coupled plasma-atomic emission spectrometry.…”

Section: Methodsmentioning

confidence: 53%

Polarization twist in perovskite ferrielectrics

Kitanaka

Hirano

Ogino

et al. 2016

Sci Rep

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Because the functions of polar materials are governed primarily by their polarization response to external stimuli, the majority of studies have focused on controlling polar lattice distortions. In some perovskite oxides, polar distortions coexist with nonpolar tilts and rotations of oxygen octahedra. The interplay between nonpolar and polar instabilities appears to play a crucial role, raising the question of how to design materials by exploiting their coupling. Here, we introduce the concept of ‘polarization twist’, which offers enhanced control over piezoelectric responses in polar materials. Our experimental and theoretical studies provide direct evidence that a ferrielectric perovskite exhibits a large piezoelectric response because of extended polar distortion, accompanied by nonpolar octahedral rotations, as if twisted polarization relaxes under electric fields. The concept underlying the polarization twist opens new possibilities for developing alternative materials in bulk and thin-film forms.

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Section: Methodsmentioning

confidence: 53%

Polarization twist in perovskite ferrielectrics

Kitanaka

Hirano

Ogino

et al. 2016

Sci Rep

Self Cite

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“…The development of diffraction experiments under in-situ application of electric fields to ceramic specimens at synchrotron radiation facilities has expanded considerably in the last decade [56,57,58,59,60,61,62,63,64,65,66,67,68]. In the literature, one can find a diversity of configurations regarding the relative orientation of the electric field (E) and the diffraction vectors k 0 (incident), k (diffracted) and Q (scattering) = k – k 0 .…”

Section: X-ray Diffraction and Scatteringmentioning

confidence: 99%

Ferroelectrics under the Synchrotron Light: A Review

et al. 2015

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Currently, an intensive search for high-performance lead-free ferroelectric materials is taking place. ABO3 perovskites (A = Ba, Bi, Ca, K and Na; B = Fe, Nb, Ti, and Zr) appear as promising candidates. Understanding the structure–function relationship is mandatory, and, in this field, the roles of long- and short-range crystal orders and interactions are decisive. In this review, recent advances in the global and local characterization of ferroelectric materials by synchrotron light diffraction, scattering and absorption are analyzed. Single- and poly-crystal synchrotron diffraction studies allow high-resolution investigations regarding the long-range average position of ions and subtle global symmetry break-downs. Ferroelectric materials, under the action of electric fields, undergo crystal symmetry, crystallite/domain orientation distribution and strain condition transformations. Methodological aspects of monitoring these processes are discussed. Two-dimensional diffraction clarify larger scale ordering: polycrystal texture is measured from the intensities distribution along the Debye rings. Local order is investigated by diffuse scattering (DS) and X-ray absorption fine structure (XAFS) experiments. DS provides information about thermal, chemical and displacive low-dimensional disorders. XAFS investigation of ferroelectrics reveals local B-cation off-centering and oxidation state. This technique has the advantage of being element-selective. Representative reports of the mentioned studies are described.

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“…15,23,65 This can be understood given that the local symmetry, which is mainly determined by the tilt system, directly limits the possible polarization directions. 66,67 It has also been shown that the first coordination shell of the bismuth cations, which carry the largest part of the polarization, is tilt-dependent, 68 and Bi-O vibrations make a major contribution to the dielectric response. 69 Finally, several studies have provided indications of coupling between phonon modes related to octahedral tilting or ferroelectricity, 16,70,71 even if this coupling may not be very strong.…”

Section: Introductionmentioning

confidence: 99%

Relaxation of dynamically disordered tetragonal platelets in the relaxor ferroelectric 0.964Na1/2Bi1/2TiO3−0.036
Pforr
¹
,
Meyer
²
,
Major
³

et al. 2017
Phys. Rev. B
8
0
2
0
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The local dynamics of the lead-free relaxor 0.964Na 1/2 Bi 1/2 TiO 3 − 0.036BaTiO 3 (NBT-3.6BT) have been investigated by a combination of quasielastic neutron scattering (QENS) and ab initio molecular dynamics simulations. In a previous paper, we were able to show that the tetragonal platelets in the microstructure are crucial for understanding the dielectric properties of NBT-3.6BT [F. Pforr et al., Phys. Rev. B 94, 014105 (2016)]. To investigate their dynamics, ab initio molecular dynamics simulations were carried out using Na 1/2 Bi 1/2 TiO 3 with 001 cation order as a simple model system for the tetragonal platelets in NBT-3.6BT. Similarly, 111-ordered Na 1/2 Bi 1/2 TiO 3 was used as a model for the rhombohedral matrix. The measured single crystal QENS spectra could be reproduced by a linear combination of calculated spectra. We find that the relaxational dynamics of NBT-3.6BT are concentrated in the tetragonal platelets. Chaotic stages, during which the local tilt order changes incessantly on the timescale of several picoseconds, cause the most significant contribution to the quasielastic intensity. They can be regarded as an excited state of tetragonal platelets, whose relaxation back into a quasistable state might explain the frequency dependence of the dielectric properties of NBT-3.6BT in the 100 GHz to THz range. This substantiates the assumption that the relaxor properties of NBT-3.6BT originate from the tetragonal platelets.

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Polarization Rotation and Monoclinic Distortion in Ferroelectric (Bi0.5Na0.5)TiO3–BaTiO3 Single Crystals under Electric Fields

Cited by 25 publications

References 80 publications

Polarization twist in perovskite ferrielectrics

Polarization twist in perovskite ferrielectrics

Ferroelectrics under the Synchrotron Light: A Review

Relaxation of dynamically disordered tetragonal platelets in the relaxor ferroelectric 0.964Na1/2Bi1/2TiO3−0.036
Pforr
¹
,
Meyer
²
,
Major
³

et al. 2017
Phys. Rev. B
8
0
2
0
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Polarization Rotation and Monoclinic Distortion in Ferroelectric (Bi0.5Na0.5)TiO3–BaTiO3 Single Crystals under Electric Fields

Cited by 25 publications

References 80 publications

Polarization twist in perovskite ferrielectrics

Polarization twist in perovskite ferrielectrics

Ferroelectrics under the Synchrotron Light: A Review

Relaxation of dynamically disordered tetragonal platelets in the relaxor ferroelectric 0.964Na1/2Bi1/2TiO3−0.036Pforr1, Meyer2, Major3 et al. 2017Phys. Rev. B8020View full textAdd to dashboardCite

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Relaxation of dynamically disordered tetragonal platelets in the relaxor ferroelectric 0.964Na1/2Bi1/2TiO3−0.036
Pforr
¹
,
Meyer
²
,
Major
³

et al. 2017
Phys. Rev. B
8
0
2
0
View full text Add to dashboard Cite