An x-ray diffraction and Raman spectroscopy investigation of A-site substituted perovskite compounds: the (Na1-xKx)0.5Bi0.5TiO3(0lexle1) solid solution

Kreisel, J.; Glazer, A. M.; Jones, Geraint; Thomas, Pam A.; Abello, L.; Lucazeau, G.

doi:10.1088/0953-8984/12/14/305

Cited by 363 publications

(291 citation statements)

References 42 publications

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“…7(a). The spectrum is consistent with previous reports, 15,[21][22][23][24] where it was assigned as belonging to the pseudo-rhombohedral R3c phase, for which a total of 13 Ramanactive modes (Γ Raman, R3c =4A 1 +9E) are expected. 23 Three main regions can be discerned.…”

Section: Raman Spectroscopy Of Unmodified and Fe-modified Nbtsupporting

confidence: 91%

“…[16][17][18][19] Raman spectroscopy has been used to study phase transitions and the nanoscale structural characteristics of NBT and its solid solutions. 15,[20][21][22][23][24] Due to challenges of intrinsic broadening and overlapping of phonon modes in the assignment of mode symmetries, structural analysis thus relies on analyzing soft-mode or hard-mode behavior as a function of composition, pressure or temperature. 15,[21][22][23][24] Other studies in NBT-BT 25 and NBT-SrTiO 3 24 generally confirmed that transitions involving the ferroelectric behavior are related to subtle local structural distortions and phase coexistence.…”

Section: As Well Asmentioning

confidence: 99%

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Structure and properties of Fe-modified Na0.5Bi0.5TiO3at ambient

et al. 2012

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Sodium bismuth titanate (NBT) ceramics are among the most promising lead-free materials for piezoelectric applications. This work reports the crystal structure and phase evolution of NBT and Fe-modified NBT (from 0-2 at% Fe) using synchrotron X-ray diffraction and Raman spectroscopy, both at ambient and elevated temperatures. The crystallographic results are discussed with reference to permittivity and piezoelectric thermal depolarization measurements of the same compositions. Changes in the depolarization temperature due to Fe substitution were detected by Raman spectroscopy, and were found to correlate closely with depolarization temperatures obtained from converse piezoelectric coefficient and permittivity measured in situ. The depolarization temperatures obtained from direct piezoelectric coefficient measured ex situ as well as the phase transition temperatures obtained from synchrotron X-ray diffraction were found to be at higher temperatures. The mechanisms underlying the relationship between permittivity and piezoelectric depolarization to structural transitions observed in Raman spectroscopy and X-ray diffraction are discussed.

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Section: Raman Spectroscopy Of Unmodified and Fe-modified Nbtsupporting

confidence: 91%

Section: As Well Asmentioning

confidence: 99%

Structure and properties of Fe-modified Na0.5Bi0.5TiO3at ambient

et al. 2012

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“…Bismuth sodium titanate (Bi 0.5 Na 0.5 )TiO 3 (BNT) has been recognized as one of the most promising candidates for the lead-free piezoelectric material [5,[10][11][12][13]. To clarify the origin of its ferroelectricity, the crystal structure has been intensively analyzed in detail [14][15][16][17][18][19][20][21][22]. The averaged structure of BNT has been reported to be a rhombohedral structure in space group R3c.…”

Section: Open Accessmentioning

confidence: 99%

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

et al. 2014

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Abstract:The features of the crystal structures and spontaneous polarization (P s ) under an electric field (E) have been reviewed for (1 − x)(Bi 0.5 Na 0.5 )TiO 3 -xBaTiO 3 (BNT-BT). In-situ measurements of high-resolution synchrotron radiation X-ray diffraction (SR-XRD) under electric fields show that single crystals with x = 0 (BNT) and 5% have a monoclinic distortion in space group Cc at 25 °C. The SR-XRD study combined with density functional theory (DFT) calculations demonstrates that BNT-5%BT exhibits a rotation of P s in the monoclinic a-c plane by 2° under an E of 70 kV/cm along the <001> pseudo-cubic direction, which is much larger than BNT.

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“…For example, neutron scattering and high-resolution synchrotron x-ray diffraction (XRD) identified a relatively wide transition range over which T and R phases coexist, [16][17][18] and transmission electron microscopy (TEM) images of powder samples evidenced an intermediate modulated orthorhombic (O) phase between the R and T phases in the temperature range between 230 and 300 C. 19,20 Raman spectroscopy represents another local probe to study NBT-x%BT. 21,22 Theoretically, for the ferroelectric rhombohedral R3c phase of NBT-x%BT, there are 13 Raman active modes, 23 including 7A 1 and 6E modes. Prior experimental investigations have shown that these peaks are broad and cannot all be resolved from each other but can be categorized into those pertaining to one of three frequency ranges.…”

Section: Introductionmentioning

confidence: 99%

Raman spectroscopic study of Na1/2Bi1/2TiO3-x%BaTiO3 single crystals as a function of temperature and composition

Luo

et al. 2011

Journal of Applied Physics

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Articles you may be interested inChemical and structural effects on the high-temperature mechanical behavior of (1−x)(Na1/2Bi1/2)TiO3-xBaTiO3 ceramics J. Appl. Phys. 117, 134110 (2015); 10.1063/1.4916784Anisotropy of ferroelectric behavior of (1 − x)Bi1/2Na1/2TiO3-xBaTiO3 single crystals across the morphotropic phase boundary J. Appl. Phys. 116, 044111 (2014) A Raman spectroscopic study of Na 1/2 Bi 1/2 TiO 3 -x%BaTiO 3 (NBT-x%BT) single crystals with x ¼ 0 and 5.6 has been performed as a function of temperature from 25 to 600 C. The general features of the Raman spectra for the various compositions were similar over the region of the phase diagram investigated, with only subtle changes between rhombohedral (R), tetragonal (T) and cubic phases. The peaks were broad, with no significant narrowing on cooling through a phase transition. We find evidence of an oxygen octahedral rotational mode in the paraelectric state. On cooling near and below the ferroelectric Curie temperature, a gradual change in intensity of the A-O and B-O peaks occurred with decreasing temperature. Evidence of a ferroelectric ! antiferroelectric transition was found near 200-250 C, consistent with the onset of dispersion in the dielectric constant. The phase transition mechanism was discussed. The findings indicate the presence of a broad distribution of quasistatic local structural distortions, which only have subtle differences in the various average structures.

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An x-ray diffraction and Raman spectroscopy investigation of A-site substituted perovskite compounds: the (Na_1-xK_x)_0.5Bi_0.5TiO₃(0lexle1) solid solution

Cited by 363 publications

References 42 publications

Structure and properties of Fe-modified Na0.5Bi0.5TiO3at ambient

Structure and properties of Fe-modified Na0.5Bi0.5TiO3at ambient

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

Raman spectroscopic study of Na1/2Bi1/2TiO3-x%BaTiO3 single crystals as a function of temperature and composition

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