Soft phonon and bismuth content in ferroelectric SrBi2Ta2O9

Kojima, Seiji; Saitoh, Itaru

doi:10.1016/s0921-4526(98)01440-9

Cited by 35 publications

(14 citation statements)

References 9 publications

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“…As the thickness decreases the Si signal increases. The spectral shape of the Raman spectra is good agreement with the previous reports using the SBT single crystals [6,7]. From this coincidence, it is confirmed that the thin films are constructed of SBT small crystals and have good quality.…”

Section: Thickness Dependence Of Raman Scattering Spectrasupporting

confidence: 90%

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Ferroelectric SrBi₂Ta₂O₉Thin Film Studied by Micro-Raman Scattering and Atomic Force Microscopy

Sakai

Yoshie

2011

Ferroelectrics

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O 9 thin films were prepared by metal-organic decomposition technique on Si wafers. The thickness dependence of the films was studied by microRaman scattering and atomic force microscopy (AFM). From the AFM observation, it is found that films were constructed of c-axis-oriented grains. The low frequency component of the Raman spectra of the films decreases as the temperature increases. The spectral analysis of the low frequency component has been carried out by using a damped harmonic-oscillator model and a relaxational model. The relaxation time has the similar value of that reported in KDP. It is suggested the physical origin of the low frequency component may be polarization fluctuation.

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Section: Thickness Dependence Of Raman Scattering Spectrasupporting

confidence: 90%

“…In addition, Raman scattering measurements of the single crystal were carried out to clear the phase transition mechanism [6,7]. The soft modes appear near the phase transition temperature.…”

Section: Introductionmentioning

confidence: 99%

Ferroelectric SrBi₂Ta₂O₉Thin Film Studied by Micro-Raman Scattering and Atomic Force Microscopy

Sakai

Yoshie

2011

Ferroelectrics

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“…[13][14][15] An optical soft mode ͑SM͒ was observed in the FE phase spectra below 30 cm Ϫ1 , however, it softens only partially and disappears from the Raman spectra already 50 K below T c2 . The SM in the FE phase is expected to be active in both IR and Raman spectra.…”

mentioning

confidence: 95%

Ferroelastic phase in SrBi2Ta2O9 and study of the ferroelectric phase-transition dynamics

Kamba

Pokorný

Porokhonskyy

et al. 2002

Applied Physics Letters

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Polarized microscope observation of ferroelastic domains in a SrBi2Ta2O9 (SBT) single crystal reveals the presence of domains up to Tc1≃770 K, which supports the ferroelasticity and Amam symmetry of the intermediate phase between ferroelectric and paraelectric phases. Far-infrared spectra of SBT ceramics, single crystal and thin films show a well underdamped optical soft mode at 28 cm−1, which partially softens to 21 cm−1 near the ferroelectric transition temperature (Tc2≅600 K). This softening does not explain the entire anomaly of low-frequency permittivity observed near Tc2. On the basis of high-frequency measurements, which do not show a significant dispersion, central-mode-type dispersion in the 10–100 GHz range is proposed as an explanation. So, the phase transition at Tc2 apparently shows a crossover behavior between the displacive and the order–disorder type.

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“…Ferroelectric structure has space group A2 1 am (Z prim =2) and undergoes the phase transition (PT) to paraelectric phase at T c1 near 600 K. Recently was discovered intermediate tetragonal ferroelastic phase with Amam space group(Z prim =2) [7,8,9] which undergous to paraelectric paraelastic phase with I4/mmm (Z prim =1) structure above T c2 ≅ 770 K. This second phase transition is improper ferroelastic (with doubling of the primitive unit-cell volume on cooling) and the lower temperature one is proper ferroelectric (no multiplication of the primitive unit-cell volume with respect to the ferroelastic phase) [9]. The dynamics of the PT's in SBT has been investigated first by Raman scattering [10,11,12], later by Brillouin scattering [13] and Fourier transform infrared (FTIR) reflectivity and transmission spectroscopy [9,14,15]. It was shown that the lowest frequency optic phonon near 28 cm -1 (at 300 K) reduces its frequency on heating and even disappears from Raman spectra above T c1 due to the change of selection rules.…”

Section: Introductionmentioning

confidence: 99%

High-temperature phase transitions in SrBi₂Ta₂O₉film: a study by THz spectroscopy

Kadlec¹,

Kamba²,

Kužel³

et al. 2004

J. Phys.: Condens. Matter

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Time-domain THz transmission experiment was performed on SrBi 2 Ta 2 O 9 thick film (deposited on sapphire substrate) at temperatures between 30 and 923 K and complex dielectric spectra of the film were determined. The lowest frequency optic phonon near 28 cm -1 reveals slow monotonous decrease in frequency on heating with no significant anomaly near either the ferroelectric or ferroelastic phase transitions. An additional relaxation mode was resolved in the THz dielectric spectra at all temperatures and its slowing down to ferroelectric phase transition explains dielectric anomaly near T c1 . Second harmonic generation signal was observed in single crystal not only below T c1 but also below T c2 , which confirms the presence of intermediate ferroelastic phase.

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Soft phonon and bismuth content in ferroelectric SrBi2Ta2O9

Cited by 35 publications

References 9 publications

Ferroelectric SrBi₂Ta₂O₉Thin Film Studied by Micro-Raman Scattering and Atomic Force Microscopy

Ferroelectric SrBi₂Ta₂O₉Thin Film Studied by Micro-Raman Scattering and Atomic Force Microscopy

Ferroelastic phase in SrBi2Ta2O9 and study of the ferroelectric phase-transition dynamics

High-temperature phase transitions in SrBi₂Ta₂O₉film: a study by THz spectroscopy

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Soft phonon and bismuth content in ferroelectric SrBi2Ta2O9

Cited by 35 publications

References 9 publications

Ferroelectric SrBi2Ta2O9Thin Film Studied by Micro-Raman Scattering and Atomic Force Microscopy

Ferroelectric SrBi2Ta2O9Thin Film Studied by Micro-Raman Scattering and Atomic Force Microscopy

Ferroelastic phase in SrBi2Ta2O9 and study of the ferroelectric phase-transition dynamics

High-temperature phase transitions in SrBi2Ta2O9film: a study by THz spectroscopy

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Ferroelectric SrBi₂Ta₂O₉Thin Film Studied by Micro-Raman Scattering and Atomic Force Microscopy

Ferroelectric SrBi₂Ta₂O₉Thin Film Studied by Micro-Raman Scattering and Atomic Force Microscopy

High-temperature phase transitions in SrBi₂Ta₂O₉film: a study by THz spectroscopy