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Mesoscopic fast ion conduction in nanometre-scale planar heterostructures

Author

Listed:
  • N. Sata

    (Max-Planck-Institut für Festkörperforschung)

  • K. Eberman

    (Max-Planck-Institut für Festkörperforschung
    3M Center)

  • K. Eberl

    (Max-Planck-Institut für Festkörperforschung)

  • J. Maier

    (Max-Planck-Institut für Festkörperforschung)

Abstract

Ion conduction is of prime importance for solid-state reactions in ionic systems, and for devices such as high-temperature batteries and fuel cells, chemical filters and sensors1,2. Ionic conductivity in solid electrolytes can be improved by dissolving appropriate impurities into the structure or by introducing interfaces that cause the redistribution of ions in the space-charge regions3,4,5,6,7,8,9,10,11. Heterojunctions in two-phase systems should be particularly efficient at improving ionic conduction3,4, and a qualitatively different conductivity behaviour is expected when interface spacing is comparable to or smaller than the width of the space-charge regions in comparatively large crystals12,13,14,15. Here we report the preparation, by molecular-beam epitaxy, of defined heterolayered films composed of CaF2 and BaF2 that exhibit ionic conductivity (parallel to the interfaces) increasing proportionally with interface density—for interfacial spacing greater than 50 nanometres. The results are in excellent agreement with semi-infinite space-charge calculations3, assuming a redistribution of fluoride ions at the interfaces. If the spacing is reduced further, the boundary zones overlap and the predicted mesoscopic size effect3,12 is observed. At this point, the single layers lose their individuality and an artificial ionically conducting material with anomalous transport properties is generated. Our results should lead to fundamental insight into ionic contact processes and to tailored ionic conductors of potential relevance for medium-temperature applications.

Suggested Citation

  • N. Sata & K. Eberman & K. Eberl & J. Maier, 2000. "Mesoscopic fast ion conduction in nanometre-scale planar heterostructures," Nature, Nature, vol. 408(6815), pages 946-949, December.
  • Handle: RePEc:nat:nature:v:408:y:2000:i:6815:d:10.1038_35050047
    DOI: 10.1038/35050047
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    Cited by:

    1. Yantao Wang & Hongtao Qu & Bowen Liu & Xiaoju Li & Jiangwei Ju & Jiedong Li & Shu Zhang & Jun Ma & Chao Li & Zhiwei Hu & Chung-Kai Chang & Hwo-Shuenn Sheu & Longfei Cui & Feng Jiang & Ernst R. H. Eck , 2023. "Self-organized hetero-nanodomains actuating super Li+ conduction in glass ceramics," Nature Communications, Nature, vol. 14(1), pages 1-11, December.
    2. Majid Monajjemi & Fatemeh Mollaamin, 2024. "Development of Solid-State Lithium-Ion Batteries (LIBs) to Increase Ionic Conductivity through Interactions between Solid Electrolytes and Anode and Cathode Electrodes," Energies, MDPI, vol. 17(18), pages 1-16, September.
    3. Hiram Kwak & Jae-Seung Kim & Daseul Han & Jong Seok Kim & Juhyoun Park & Gihan Kwon & Seong-Min Bak & Unseon Heo & Changhyun Park & Hyun-Wook Lee & Kyung-Wan Nam & Dong-Hwa Seo & Yoon Seok Jung, 2023. "Boosting the interfacial superionic conduction of halide solid electrolytes for all-solid-state batteries," Nature Communications, Nature, vol. 14(1), pages 1-14, December.

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