Local Structure of Relaxor Dielectric Ceramics

Liu, Yun; Withers, Ray L.

doi:10.5772/23247

Cited by 1 publication

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“…Very little is known about Mg 2+ at the A site of a pyrochlore, with the only example, to our knowledge, being (Bi,Mg) 2 (Nb,Mg) 2 O 7 (BMN). 22,23 The presence of Mg 2+ in a CN = 8 site, such as that present at the A site of the pyrochlore, is unusual based on the small size of the cation. The BMN compound is unique, with Mg occupying both the A (CN = 8) and M (CN = 6) sites of the pyrochlore.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Influence of Alkaline-Earth-Metal Substitutions on the Bismuth Ruthenate Structure: Bi_2–xA′_xRu₂O₆O′_1–y (A′ = Mg, Ca, Sr)

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Mullins

et al. 2020

Inorg. Chem.

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Solid solutions with the formula of Bi 2−x A′ x Ru 2 O 7−y (A′ = Mg, Ca, Sr; 0 ≤ x ≤ 0.2 for Mg, 0 ≤ x ≤ 1 for Ca, and 0 ≤ x ≤ 0.5 for Sr) have been synthesized and characterized. The crystal structures for these phases are found to be in the pyrochlore family, crystallizing in the cubic space group Fd3̅ m with complex A/A′ cation coordination environments. The Bi cation is found to be off-center from the ideal position because of a lone-pair distortion, while the positions of the substituted A′ cations vary based on the size and ionicity. The neutron structure refinements reveal a similar propensity to off-center regarding Ca and Sr, while Mg features the largest static displacement of up to 0.48 Å. Interestingly, this is one of only two known pyrochlores with Mg 2+ located in an 8coordinated site. The average Ru oxidation state for each substitution is found to increase, and charge compensates for the lower divalent A′ substitution. The solid solutions show temperature-independent resistance across the series with small changes in magnitude that scale with the amount of substitution, while displaying Pauli paramagnetic behavior throughout.

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Section: ■ Experimental Sectionmentioning

confidence: 99%

Influence of Alkaline-Earth-Metal Substitutions on the Bismuth Ruthenate Structure: Bi_2–xA′_xRu₂O₆O′_1–y (A′ = Mg, Ca, Sr)

Converse

Mullins

et al. 2020

Inorg. Chem.

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show abstract

Local Structure of Relaxor Dielectric Ceramics

Cited by 1 publication

References 19 publications

Influence of Alkaline-Earth-Metal Substitutions on the Bismuth Ruthenate Structure: Bi_2–xA′_xRu₂O₆O′_1–y (A′ = Mg, Ca, Sr)

Influence of Alkaline-Earth-Metal Substitutions on the Bismuth Ruthenate Structure: Bi_2–xA′_xRu₂O₆O′_1–y (A′ = Mg, Ca, Sr)

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Local Structure of Relaxor Dielectric Ceramics

Cited by 1 publication

References 19 publications

Influence of Alkaline-Earth-Metal Substitutions on the Bismuth Ruthenate Structure: Bi2–xA′xRu2O6O′1–y (A′ = Mg, Ca, Sr)

Influence of Alkaline-Earth-Metal Substitutions on the Bismuth Ruthenate Structure: Bi2–xA′xRu2O6O′1–y (A′ = Mg, Ca, Sr)

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Influence of Alkaline-Earth-Metal Substitutions on the Bismuth Ruthenate Structure: Bi_2–xA′_xRu₂O₆O′_1–y (A′ = Mg, Ca, Sr)

Influence of Alkaline-Earth-Metal Substitutions on the Bismuth Ruthenate Structure: Bi_2–xA′_xRu₂O₆O′_1–y (A′ = Mg, Ca, Sr)