Cation disorder in Sr0.67Ba0.33Nb2O6 assessed by aberration corrected stem

López‐Conesa, Lluís; Rebled, J.M.; Ruiz‐Caridad, Alicia; Torres‐Pardo, Almudena; Ruiz‐González, M. Luisa; González-Calbet, J.M.; Dezanneau, G.; Estradé, S.; Peiró, Francesca

doi:10.1016/j.rinma.2019.100038

Cited by 2 publications

(1 citation statement)

References 17 publications

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“…The general assumption for the cation configuration is that Sr 2+ is mainly occupying the smaller A1 site, while Ba 2+ is mainly occupying the larger A2 site. Additionally, there is a possibility for mixed occupancy on both sites, as reported for the filled TTB, Ba 4 Na 2 Nb 10 O 30 (BNN), having approximately ∼10% of the larger Ba 2+ going to the smaller A1 site. , Several works have thus studied the cation configuration in SBN: X-ray powder diffraction, , combined neutron and X-ray powder diffraction, X-ray single-crystal diffraction, ,, transmission electron microscopy (TEM), and density functional theory (DFT) . However, owing to subtleties in the SBN structure and chemistry, which will be introduced in detail below, it is not clear how these diffraction studies could reliably obtain accurate site occupancies with the exception of the combined neutron and X-ray powder diffraction work.…”

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confidence: 99%

A-Site Cation Disorder in Sr_xBa_1–xNb₂O₆ (x = 0.25, 0.33, 0.50, 0.61) Studied by High-Resolution Resonant X-ray Powder Diffraction

Grendal,

Fitch,

Aamlid

2023

ACS Omega

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The dielectric and ferroelectric properties of Sr x Ba1–x Nb2O6 (SBN, 0.2 < x < 0.8) are known to be affected by the Sr fraction and can be further controlled by various quenching schemes. Changes in A-site cation configuration are believed to be linked to these changes in properties. In this work, we study the A-site cation disorder in SBN by the use of high-resolution resonant X-ray powder diffraction. The experimental results show that the larger Ba2+ is found exclusively on the larger A2 site, while Sr2+ is found on both the A1 and A2 sites, with an increasing amount on A2 with an increasing Sr fraction. At elevated temperatures, a small migration of Sr2+ from A1 to A2 is observed for SBN50 and SBN61. Linking this change in occupancies to changes in the average cation size on the A1 and A2 sites allows for rationalization of the property changes observed for quenched samples. Furthermore, SBN25 is shown to deviate from the tetragonal P4bm structure and is found to be orthorhombic with a Cmm2 structure.

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Section: Introductionmentioning

confidence: 99%

A-Site Cation Disorder in Sr_xBa_1–xNb₂O₆ (x = 0.25, 0.33, 0.50, 0.61) Studied by High-Resolution Resonant X-ray Powder Diffraction

Grendal,

Fitch,

Aamlid

2023

ACS Omega

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New high temperature dielectrics: Bi-free tungsten bronze ceramics with stable permittivity over a very wide temperature range

Brown

Hall

et al. 2021

Journal of the European Ceramic Society

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High relative permittivity, εr, over a very wide temperature range, -65 ⁰C to 325 ⁰C, is presented for ceramics designed to be compatible with base metal electrode multilayer capacitor manufacturing processes. We report a ≥ 300 ⁰C potential Class II capacitor material, free from Bi or Pb ions, developed by doping Sr2NaNb5O15 with Ca2+, Y3+ and Zr4+ ions, according to the formulation Sr2-2zCazYzNaNb5-zZrzO15. For sample composition z = 0.025, εr values are 1565 ± 15 % (1 kHz) from -65 °C to 325 °C. At a slightly higher level of doping, z = 0.05, εr values are 1310 ± 10 % from -65 °C to 300 °C. Values of the dielectric loss tangent, tanδ are ≤ 0.025 from -60 °C to 290 °C, for z = 0.025, with tanδ increasing to 0.035 at 325 ⁰C. Microstructural analyses exclude coreshell mechanisms being responsible for the flattening of the εr -T response.

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Cation disorder in Sr0.67Ba0.33Nb2O6 assessed by aberration corrected stem

Cited by 2 publications

References 17 publications

A-Site Cation Disorder in Sr_xBa_1–xNb₂O₆ (x = 0.25, 0.33, 0.50, 0.61) Studied by High-Resolution Resonant X-ray Powder Diffraction

A-Site Cation Disorder in Sr_xBa_1–xNb₂O₆ (x = 0.25, 0.33, 0.50, 0.61) Studied by High-Resolution Resonant X-ray Powder Diffraction

New high temperature dielectrics: Bi-free tungsten bronze ceramics with stable permittivity over a very wide temperature range

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Cation disorder in Sr0.67Ba0.33Nb2O6 assessed by aberration corrected stem

Cited by 2 publications

References 17 publications

A-Site Cation Disorder in SrxBa1–xNb2O6 (x = 0.25, 0.33, 0.50, 0.61) Studied by High-Resolution Resonant X-ray Powder Diffraction

A-Site Cation Disorder in SrxBa1–xNb2O6 (x = 0.25, 0.33, 0.50, 0.61) Studied by High-Resolution Resonant X-ray Powder Diffraction

New high temperature dielectrics: Bi-free tungsten bronze ceramics with stable permittivity over a very wide temperature range

Contact Info

Product

Resources

About

A-Site Cation Disorder in Sr_xBa_1–xNb₂O₆ (x = 0.25, 0.33, 0.50, 0.61) Studied by High-Resolution Resonant X-ray Powder Diffraction

A-Site Cation Disorder in Sr_xBa_1–xNb₂O₆ (x = 0.25, 0.33, 0.50, 0.61) Studied by High-Resolution Resonant X-ray Powder Diffraction