Transmission-electron-microscopy study of quasi-epitaxial tungsten-bronze (Sr2.5Ba2.5Nb10O30) thin film on perovskite (SrTiO3) single crystal

Su, Dong; Infortuna, Anna; Muralt, Paul; Setter, N.; Cantoni, Marco

doi:10.1557/jmr.2007.0018

Cited by 6 publications

(11 citation statements)

References 17 publications

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“…Previous works on TTB [001]-oriented films showed formation of a dense coating, ,, while in the present work, [001]-oriented single nanorods were observed, which is an unreported result so far. The lattice spacing c being considerably smaller than a , the structure presents a strong anisotropy (see Figure b).…”

Section: Discussionsupporting

confidence: 48%

Nanorods of Potassium Tantalum Niobate Tetragonal Tungsten Bronze Phase Grown by Pulsed Laser Deposition

et al. 2013

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International audienceK−Ta−Nb−O tetragonal tungsten bronze phase was grown on (11̅02) Al2O3 (R-plane sapphire) by pulsed laser deposition. The microstructure, structure, and chemical composition of the deposit were studied by scanning electron microscopy, X-ray diffraction, energy-dispersive X-ray spectrometry, and transmission electron microscopy. The crystal structure was solved by precession electron diffraction as being tetragonal tungsten bronze-type structure with space group P4/mbm, refined cell parameters a = 12.537 ± 0.003 Å, c = 3.975 ± 0.001 Å, and composition K5.06(Ta0.57Nb0.43)10.99O30. The tetragonal potassium tantalum niobate growth follows two modes with respect to the substrate surface: (i) as single vertical right parallelepiped-shaped nanorods (50 to 100 nm wide and up to 1 μm in length) along the [001] direction and (ii) as in-plane attached crystals along the ⟨310⟩ direction. These two growth modes are understood as being governed by the plane termination of the substrate. This new phase is of potential interest due to the physical (dielectric, catalytic, etc.) properties evidenced for tetragonal tungsten bronze phases in numerous systems

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Section: Discussionsupporting

confidence: 48%

Nanorods of Potassium Tantalum Niobate Tetragonal Tungsten Bronze Phase Grown by Pulsed Laser Deposition

et al. 2013

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“…[28] Extensive work has also been done by Setter to verify the orientations of SBN present after PLD growth on STO. [29,30] For the integration of SBN-based electro-optical switches with silicon photonics, it is vital to grow crystalline SBN of welldefined orientation on Si. One way to do this is using an intermediate layer of STO.…”

Section: Sbn Crystal Structurementioning

confidence: 99%

Growth and Structure of Strong Pockels Material Strontium Barium Niobate on SrTiO₃ and Si by Molecular Beam Epitaxy

Beskin

Kwon

Posadas

et al. 2021

Advanced Photonics Research

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Strontium barium niobate (Sr x Ba 1-x Nb 2 O 6 , referred to as SBN) is a material of interest for making efficient optical modulators due to its very high electro-optic (EO or Pockels) coefficient. SBN is a ferroelectric with a Curie temperature that varies between 20 and 80 C, depending on its Sr/Ba ratio. Structurally, it belongs to the tetragonal tungsten bronze family. The successful integration of SBN on Si in textured epitaxial form using molecular beam epitaxy via a SrTiO 3 (STO) buffer layer is reported. X-ray diffraction and scanning transmission electron microscopy are used to analyze the crystalline quality, STO/SBN interface structure, and preferred orientations of the SBN film. Thin, highly oriented SBN films integrated on Si have potential applications in low power and small footprint integrated Si photonics.

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“…Thin films offer advantages including texturing of the materials, improvement of properties, and potential minimization of devices . For example, strain engineering with a proper choice of substrate and synthesis method can tune the properties of ferroelectric thin films. − SBN thin films have been deposited by different synthesis methods, including PLD, − RF sputtering, − sol–gel synthesis, − polymeric chemical method, , and chemical solution deposition (CSD) . The physical deposition techniques are time-consuming, hard to upscale, or expensive, while wet chemical synthesis often uses toxic organic solvents.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…The structure of SBN thin films typically ranges from polycrystalline to oriented and epitaxial, ,,, where the type of substrate is an important parameter. Epitaxial or highly oriented growth has been reported on MgO, ,,,,,, SrTiO 3 (STO), ,,,, Si(100), , and LaNiO 3 /CeO 2 /YSZ/Si(100) . The epitaxial orientation of SBN is mostly reported with the c-axis perpendicular to the substrate surface and with a rotation of 18.43° around the c-axis in SBN compared to the substrate. ,, There are two equivalent rotations, and a twin structure is often observed.…”

Section: Introductionmentioning

confidence: 99%

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Crystallization and Texturing of Sr_xBa_1–xNb₂O₆ Thin Films Prepared by Aqueous Solution Deposition─An In Situ X-ray Diffraction Study

Pedersen

Blichfeld

Bakken

et al. 2022

Crystal Growth & Design

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Aqueous chemical solution deposition (CSD) is an environmentally friendly and highly flexible fabrication route to prepare oxide thin films. Here, we present an aqueous CSD process for ferroelectric Sr x Ba 1−x Nb 2 O 6 (SBN) thin films on SrTiO 3 (STO) single-crystal substrates. In situ synchrotron X-ray diffraction was employed to study the crystallization of the films during thermal processing with heating rates in the range 0.04−20 °C/s. Three different crystal orientations of SBN were observed based on the heating rate and the orientation of the STO substrates. SBN(001) and SBN(310) orientations were observed on STO(100), while only the SBN(311) orientation was observed on STO(110). The SBN(001) orientation was favored by an ultraslow heating rate of 0.04 °C/s, suggesting that this is the thermodynamic stable orientation. The SBN(310) orientation was kinetically favored at moderate heating rates and also promoted by increasing the Sr content in the film. A high heating rate of 20 °C/s rendered polycrystalline SBN films. It was revealed that nucleation and growth occurred via a classical Volmer−Weber (VW) growth mode and that the SBN grains preferably grow along the c-axis. The present findings demonstrate that control of nucleation and growth is a prerequisite to deposit films with different orientations and textures, which is detrimental for the film properties.

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Transmission-electron-microscopy study of quasi-epitaxial tungsten-bronze (Sr_2.5Ba_2.5Nb₁₀O₃₀) thin film on perovskite (SrTiO₃) single crystal

Cited by 6 publications

References 17 publications

Nanorods of Potassium Tantalum Niobate Tetragonal Tungsten Bronze Phase Grown by Pulsed Laser Deposition

Nanorods of Potassium Tantalum Niobate Tetragonal Tungsten Bronze Phase Grown by Pulsed Laser Deposition

Growth and Structure of Strong Pockels Material Strontium Barium Niobate on SrTiO₃ and Si by Molecular Beam Epitaxy

Crystallization and Texturing of Sr_xBa_1–xNb₂O₆ Thin Films Prepared by Aqueous Solution Deposition─An In Situ X-ray Diffraction Study

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Transmission-electron-microscopy study of quasi-epitaxial tungsten-bronze (Sr2.5Ba2.5Nb10O30) thin film on perovskite (SrTiO3) single crystal

Cited by 6 publications

References 17 publications

Nanorods of Potassium Tantalum Niobate Tetragonal Tungsten Bronze Phase Grown by Pulsed Laser Deposition

Nanorods of Potassium Tantalum Niobate Tetragonal Tungsten Bronze Phase Grown by Pulsed Laser Deposition

Growth and Structure of Strong Pockels Material Strontium Barium Niobate on SrTiO3 and Si by Molecular Beam Epitaxy

Crystallization and Texturing of SrxBa1–xNb2O6 Thin Films Prepared by Aqueous Solution Deposition─An In Situ X-ray Diffraction Study

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Transmission-electron-microscopy study of quasi-epitaxial tungsten-bronze (Sr_2.5Ba_2.5Nb₁₀O₃₀) thin film on perovskite (SrTiO₃) single crystal

Growth and Structure of Strong Pockels Material Strontium Barium Niobate on SrTiO₃ and Si by Molecular Beam Epitaxy

Crystallization and Texturing of Sr_xBa_1–xNb₂O₆ Thin Films Prepared by Aqueous Solution Deposition─An In Situ X-ray Diffraction Study