Compositionally complex oxides (CCOs) are an emerging class of materials encompassing high entropy and entropy stabilized oxides. These promising advanced materials leverage tunable chemical bond structure, lattice distortion, and chemical disorder for unprecedented properties. Grain boundary (GB) and point defect segregation to GBs are relatively understudied in CCOs even though they can govern macroscopic material properties. For example, GB segregation can govern local chemical (dis)order and point defect distribution, playing a critical role in electrochemical reaction kinetics, and charge and mass transport in solid electrolytes. However, compared with conventional oxides, GBs in multi-cation CCO systems are expected to exhibit more complex segregation phenomena and, thus, prove more difficult to tune through GB design strategies. Here, GB segregation was studied in a model perovskite CCO LaFe0.7Ni0.1Co0.1Cu0.05Pd0.05O3−x textured thin film by (sub-)atomic-resolution scanning transmission electron microscopy imaging and spectroscopy. It is found that GB segregation is correlated with cation reducibility—predicted by an Ellingham diagram—as Pd and Cu segregate to GBs rich in oxygen vacancies ( ). Furthermore, Pd and Cu segregation is highly sensitive to the concentration and spatial distribution of along the GB plane, as well as fluctuations in atomic structure and elastic strain induced by GB local disorder, such as dislocations. This work offers a perspective of controlling segregation concentration of CCO cations to GBs by tuning reducibility of CCO cations and oxygen deficiency, which is expected to guide GB design in CCOs.
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22 April 2024
Research Article|
April 25 2024
Tuning grain boundary cation segregation with oxygen deficiency and atomic structure in a perovskite compositionally complex oxide thin film Available to Purchase
Huiming Guo
;
Huiming Guo
(Conceptualization, Data curation, Formal analysis, Funding acquisition, Investigation, Methodology, Project administration, Resources, Software, Supervision, Validation, Visualization, Writing – original draft, Writing – review & editing)
1
Department of Materials Science and Engineering, University of California Irvine
, Irvine, California 92697, USA
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Hasti Vahidi;
Hasti Vahidi
(Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Software, Visualization, Writing – original draft, Writing – review & editing)
1
Department of Materials Science and Engineering, University of California Irvine
, Irvine, California 92697, USA
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Hyojoo Kang;
Hyojoo Kang
(Conceptualization, Formal analysis, Writing – original draft, Writing – review & editing)
1
Department of Materials Science and Engineering, University of California Irvine
, Irvine, California 92697, USA
2
Department of Materials Science and Engineering, Yonsei University
, Seoul 03722, South Korea
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Soham Shah
;
Soham Shah
(Formal analysis, Investigation, Methodology, Writing – original draft)
3
Department of Chemical and Environmental Engineering, University of California Riverside
, Riverside, California 92521, USA
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Mingjie Xu
;
Mingjie Xu
(Investigation, Methodology, Resources, Validation, Writing – review & editing)
4
Irvine Materials Research Institute (IMRI), University of California Irvine
, Irvine, California 92697, USA
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Toshihiro Aoki
;
Toshihiro Aoki
(Methodology, Resources, Software, Validation, Writing – review & editing)
4
Irvine Materials Research Institute (IMRI), University of California Irvine
, Irvine, California 92697, USA
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Timothy J. Rupert
;
Timothy J. Rupert
(Conceptualization, Resources, Software, Validation, Writing – review & editing)
1
Department of Materials Science and Engineering, University of California Irvine
, Irvine, California 92697, USA
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Jian Luo
;
Jian Luo
(Conceptualization, Validation, Writing – review & editing)
5
Department of NanoEngineering, University of California San Diego
, La Jolla, California 92093, USA
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Kandis Leslie Gilliard-AbdulAziz
;
Kandis Leslie Gilliard-AbdulAziz
(Conceptualization, Methodology, Supervision, Validation, Writing – review & editing)
3
Department of Chemical and Environmental Engineering, University of California Riverside
, Riverside, California 92521, USA
6
Department of Civil and Environmental Engineering, University of Southern California
, Los Angeles, California 90089, USA
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William J. Bowman
William J. Bowman
a)
(Conceptualization, Funding acquisition, Methodology, Project administration, Resources, Supervision, Validation, Writing – original draft, Writing – review & editing)
1
Department of Materials Science and Engineering, University of California Irvine
, Irvine, California 92697, USA
4
Irvine Materials Research Institute (IMRI), University of California Irvine
, Irvine, California 92697, USA
a)Author to whom correspondence should be addressed: [email protected]
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Huiming Guo
1
Hasti Vahidi
1
Hyojoo Kang
1,2
Soham Shah
3
Mingjie Xu
4
Toshihiro Aoki
4
Timothy J. Rupert
1
Jian Luo
5
Kandis Leslie Gilliard-AbdulAziz
3,6
William J. Bowman
1,4,a)
1
Department of Materials Science and Engineering, University of California Irvine
, Irvine, California 92697, USA
2
Department of Materials Science and Engineering, Yonsei University
, Seoul 03722, South Korea
3
Department of Chemical and Environmental Engineering, University of California Riverside
, Riverside, California 92521, USA
4
Irvine Materials Research Institute (IMRI), University of California Irvine
, Irvine, California 92697, USA
5
Department of NanoEngineering, University of California San Diego
, La Jolla, California 92093, USA
6
Department of Civil and Environmental Engineering, University of Southern California
, Los Angeles, California 90089, USA
a)Author to whom correspondence should be addressed: [email protected]
Appl. Phys. Lett. 124, 171605 (2024)
Article history
Received:
February 02 2024
Accepted:
April 13 2024
Citation
Huiming Guo, Hasti Vahidi, Hyojoo Kang, Soham Shah, Mingjie Xu, Toshihiro Aoki, Timothy J. Rupert, Jian Luo, Kandis Leslie Gilliard-AbdulAziz, William J. Bowman; Tuning grain boundary cation segregation with oxygen deficiency and atomic structure in a perovskite compositionally complex oxide thin film. Appl. Phys. Lett. 22 April 2024; 124 (17): 171605. https://doi.org/10.1063/5.0202249
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