Chemically degraded grain boundaries in fine-grain Ba0.6K0.4Fe2As2polycrystalline bulks

Fumitake Kametani; Yi Feng Su; Yesusa Collantes; Chongin Pak; Chiara Tarantini; David Larbalestier; Eric Hellstrom

doi:10.35848/1882-0786/abbfdf

Chemically degraded grain boundaries in fine-grain Ba_0.6K_0.4Fe₂As₂polycrystalline bulks

Fumitake Kametani, Yi Feng Su, Yesusa Collantes, Chongin Pak, Chiara Tarantini, David Larbalestier, Eric Hellstrom

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

Abstract

In this study, we investigated nanostructure and local compositional variations at grain boundaries (GBs) in polycrystalline Ba0.6K0.4Fe2As2 (K-Ba122) bulks. Analytical scanning transmission electron microscopy revealed that K-Ba122 bulks made in a regular glove box filled with 99.9% Ar show Ba-O segregation at the GBs, forming a network of insulated GBs. By significantly reducing the oxygen and water content in the glove box, K became preferential segregation at GBs. Our nanostructural study suggests that the K-Ba122 GBs are easily compromised by different kinds of chemistry variations that can be fully addressed only by synthesis in a very clean environment.

Original language	English
Article number	113002
Journal	Applied Physics Express
Volume	13
Issue number	11
DOIs	https://doi.org/10.35848/1882-0786/abbfdf
State	Published - Nov 1 2020
Externally published	Yes

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title = "Chemically degraded grain boundaries in fine-grain Ba0.6K0.4Fe2As2polycrystalline bulks",

abstract = "In this study, we investigated nanostructure and local compositional variations at grain boundaries (GBs) in polycrystalline Ba0.6K0.4Fe2As2 (K-Ba122) bulks. Analytical scanning transmission electron microscopy revealed that K-Ba122 bulks made in a regular glove box filled with 99.9% Ar show Ba-O segregation at the GBs, forming a network of insulated GBs. By significantly reducing the oxygen and water content in the glove box, K became preferential segregation at GBs. Our nanostructural study suggests that the K-Ba122 GBs are easily compromised by different kinds of chemistry variations that can be fully addressed only by synthesis in a very clean environment.",

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T1 - Chemically degraded grain boundaries in fine-grain Ba0.6K0.4Fe2As2polycrystalline bulks

AU - Kametani, Fumitake

AU - Su, Yi Feng

AU - Collantes, Yesusa

AU - Pak, Chongin

AU - Tarantini, Chiara

AU - Larbalestier, David

AU - Hellstrom, Eric

PY - 2020/11/1

Y1 - 2020/11/1

N2 - In this study, we investigated nanostructure and local compositional variations at grain boundaries (GBs) in polycrystalline Ba0.6K0.4Fe2As2 (K-Ba122) bulks. Analytical scanning transmission electron microscopy revealed that K-Ba122 bulks made in a regular glove box filled with 99.9% Ar show Ba-O segregation at the GBs, forming a network of insulated GBs. By significantly reducing the oxygen and water content in the glove box, K became preferential segregation at GBs. Our nanostructural study suggests that the K-Ba122 GBs are easily compromised by different kinds of chemistry variations that can be fully addressed only by synthesis in a very clean environment.

AB - In this study, we investigated nanostructure and local compositional variations at grain boundaries (GBs) in polycrystalline Ba0.6K0.4Fe2As2 (K-Ba122) bulks. Analytical scanning transmission electron microscopy revealed that K-Ba122 bulks made in a regular glove box filled with 99.9% Ar show Ba-O segregation at the GBs, forming a network of insulated GBs. By significantly reducing the oxygen and water content in the glove box, K became preferential segregation at GBs. Our nanostructural study suggests that the K-Ba122 GBs are easily compromised by different kinds of chemistry variations that can be fully addressed only by synthesis in a very clean environment.

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Chemically degraded grain boundaries in fine-grain Ba_0.6K_0.4Fe₂As₂polycrystalline bulks

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