Strontium Barium Niobate Thin Films for Dielectric and Electro-Optic Applications

Cuniot-Ponsard, Mireille

doi:10.5772/17321

Cited by 8 publications

(4 citation statements)

References 32 publications

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“…These NbO 6 octahedra are arranged in such a manner that three different interstitial sites exist in the unit cell. Only Sr atoms occupy the 12‐fold coordinated tetragonal A1 sites, whereas both Sr and Ba atoms occupy the larger 15‐fold coordinated pentagonal A2 sites; trigonal C sites are vacant, as are one‐sixth of the total A1 and A2 sites . Such a complex structure allows for the effective scattering of phonons and thus, thermal conductivities as low as 0.8 W/m·K have been reported for SBN single crystals .…”

Section: Introductionmentioning

confidence: 99%

“…Only Sr atoms occupy the 12-fold coordinated tetragonal A1 sites, whereas both Sr and Ba atoms occupy the larger 15-fold coordinated pentagonal A2 sites; trigonal C sites are vacant, as are one-sixth of the total A1 and A2 sites. 20,21 Such a complex structure allows for the effective scattering of phonons and thus, thermal conductivities as low as 0.8 W/mÁK have been reported for SBN single crystals. 22 In addition, a change in the SBN stoichiometry leads to variations in the ferroelectric-paraelectric phase transition temperature.…”

Section: Introductionmentioning

confidence: 99%

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Thermoelectric Properties of Reduced Polycrystalline Sr_0.5Ba_0.5Nb₂O₆ Fabricated Via Solution Combustion Synthesis

et al. 2013

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The thermoelectric properties of bulk polycrystalline Sr0.5Ba0.5Nb2O6 (SBN50) fabricated via solution combustion synthesis (SCS) and reduced at temperatures of 900°C–1150°C were explored. The Seebeck coefficient (S) of all samples increased over the entire range of testing temperatures; a peak S value of −281 μV/K was obtained at 930 K for the sample reduced at 900°C. A metal‐insulator transition was observed in the electrical conductivity (σ) of samples reduced at 1000°C–1150°C, whereas only semiconducting electrical behavior was observed for the sample reduced at 900°C. An optimal balance between S and σ was achieved for the pellet reduced at 1000°C, which exhibited a maximum power factor of 1.78 μW/cm·K2 at 930 K. Over a temperature range of 300–930 K, the thermal conductivity (κ) of as‐processed and reduced (1000°C) SBN50 was found to be 1.03–1.4 and 1.46–1.84 W/m·K, respectively. A maximum figure of merit (ZT) of 0.09 was obtained at 930 K for the 1000°C‐reduced sample. X‐ray photoelectron spectroscopy revealed that the Nb2+ peak intensity increased at higher reduction temperatures, which could possibly lead to a distortion of NbO6 octahedra and a decrease in the Seebeck coefficient.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermoelectric Properties of Reduced Polycrystalline Sr_0.5Ba_0.5Nb₂O₆ Fabricated Via Solution Combustion Synthesis

et al. 2013

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“…Any further detail about the preparation and the characterization of SBN films can be found in the previous reports of the author. [31][32][33][34] It is to be noted that SBN is a low coercive field ferroelectric material: E c is a few kV/cm in SBN crystals, and about 6 kV/cm in the epitaxial SBN:60 film used in this work. The latter value is 20 times lower than the coercive field reported to be about 110-120 kV/cm in PbZr x Ti 1Àx O 3 (PZT) epitaxial films.…”

Section: A Sbn Ferroelectric Thin Filmsmentioning

confidence: 94%

Kelvin probe force microscopy and electrostatic force microscopy responses to the polarization in a ferroelectric thin film: Theoretical and experimental investigations

Cuniot-Ponsard

2013

Journal of Applied Physics

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The ability of non-contact electric modes (Kelvin probe force microscopy (KPFM) and electrostatic force microscopy (EFM)) to provide quantitative information about the remnant polarization in a ferroelectric thin film is theoretically and experimentally investigated. The theoretical relationship between the microscopic signal and the polarization in the film is established: it is linear in the KPFM mode and parabolic in the EFM mode. The KPFM and EFM signals are predicted tip-shape, tip-surface distance, and poled area dimensions dependent so that an absolute value of the polarization cannot be extracted. Nevertheless provided these parameters are held constant, KPFM theoretically enables to investigate quantitatively the polarization dependence on any parameter relative to the film preparation conditions or to the poling process. It does not enable to investigate its dependence on poled area geometry. Based on these conclusions, experimental KPFM investigations have been carried out on a ferroelectric strontium barium niobate (SrxBa1−xNb2O6, SBN:100x) epitaxial thin film deposited on a platinum covered MgO substrate. Poled areas are created in the film by moving the biased tip in contact with the surface. KPFM images are dominated by the written polarization and not by injected or attracted extrinsic charges. The experimental decay of the KPFM signal with increasing tip-surface distance confirms the contribution of the volume of the lever/tip to the KPFM response. The spontaneous evolution of the written polarization as well as the polarization dependence on poling voltage and poling duration are investigated using KPFM, with the poled area dimensions as a parameter. For comparison, the macroscopic remnant polarization in the SBN film has been measured versus poling field from hysteresis cycles drawn using a macroscopic Pt dot as top contact. The significant difference observed between macroscopic and microscopic results can be accounted for by using a simple model of the inhomogeneous electric field generated by a poling tip. KPFM measurements do not alter the initial polarization of the film and can provide essential qualitative and quantitative information on the polarization in a ferroelectric thin film.

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“…The non linear properties of the SBN epitaxial thin films we prepare compete with those of (Ba, Sr)TiO 3 thin films for dielectric tunability and with those of LiNbO 3 crystals for electro-optic properties [1,2]. However the polarization, piezoelectric and electro-optic coefficients of SBN films are obtained lower, by a common factor about 5, than those of SBN crystals.…”

Section: Introductionmentioning

confidence: 95%

Local polarization in strontium barium niobate (SBN) epitaxial thin films investigated using Kelvin Force Microscopy (KFM)

Cuniot-Ponsard

2012

Proceedings of ISAF-ECAPD-PFM 2012

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Strontium Barium Niobate Thin Films for Dielectric and Electro-Optic Applications

Cited by 8 publications

References 32 publications

Thermoelectric Properties of Reduced Polycrystalline Sr_0.5Ba_0.5Nb₂O₆ Fabricated Via Solution Combustion Synthesis

Thermoelectric Properties of Reduced Polycrystalline Sr_0.5Ba_0.5Nb₂O₆ Fabricated Via Solution Combustion Synthesis

Kelvin probe force microscopy and electrostatic force microscopy responses to the polarization in a ferroelectric thin film: Theoretical and experimental investigations

Local polarization in strontium barium niobate (SBN) epitaxial thin films investigated using Kelvin Force Microscopy (KFM)

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Strontium Barium Niobate Thin Films for Dielectric and Electro-Optic Applications

Cited by 8 publications

References 32 publications

Thermoelectric Properties of Reduced Polycrystalline Sr0.5Ba0.5Nb2O6 Fabricated Via Solution Combustion Synthesis

Thermoelectric Properties of Reduced Polycrystalline Sr0.5Ba0.5Nb2O6 Fabricated Via Solution Combustion Synthesis

Kelvin probe force microscopy and electrostatic force microscopy responses to the polarization in a ferroelectric thin film: Theoretical and experimental investigations

Local polarization in strontium barium niobate (SBN) epitaxial thin films investigated using Kelvin Force Microscopy (KFM)

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Thermoelectric Properties of Reduced Polycrystalline Sr_0.5Ba_0.5Nb₂O₆ Fabricated Via Solution Combustion Synthesis

Thermoelectric Properties of Reduced Polycrystalline Sr_0.5Ba_0.5Nb₂O₆ Fabricated Via Solution Combustion Synthesis