Enhanced ionic conductivity and mesoscopic size effects in heterostructures of 
BaF2 and CaF2

Sata, N.; Jin-Phillipp, N. Y.; Eberl, K.; Maier, J.

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Enhanced ionic conductivity and mesoscopic size effects in heterostructures of BaF₂ and CaF₂

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Sata, N.
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;

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Jin-Phillipp, N. Y.
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;

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Eberl, K.
Former Scientific Facilities, Max Planck Institute for Solid State Research, Max Planck Society;

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Maier, J.
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Sata, N., Jin-Phillipp, N. Y., Eberl, K., & Maier, J. (2002). Enhanced ionic conductivity and mesoscopic size effects in heterostructures of BaF₂ and CaF₂. Solid State Ionics, 154-155, 497-502.

Cite as: https://hdl.handle.net/21.11116/0000-000E-EFA9-7

Abstract

Ionic heterolayers of CaF2/BaF2/CaF2 have been prepared by
molecular beam epitaxy (MBE). The spacing has been varied from
similar to 1 nm to similar to 1 mum. In the range of 1 mum to 5
nm, the conductivity (measured effective conductivity parallel
to the interface) increases progressively with the increased
interfacial density. This is even true for spacings in the sub-
Debye range. For comparatively large spacings (>50 nm), semi-
infinite space charges provide a quantitative description,
while the behavior at smaller spacings reveals nano-size
anomalies. At spacings smaller than similar to 5 nm, the
conductivity decreases. The results clearly demonstrate the
possibility to prepare artificial ion conductors and the
potential of mesoscopic ion conduction. The paper describes
transmission electron microscopy (TEM), X-ray diffraction
(XRD), X-ray pole figure, secondary ion mass spectrometry
(SIMS) and impedance spectroscopic characterization. (C) 2002
Elsevier Science B.V. All rights reserved.