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Segregation and properties at curved vs straight (0001) inversion boundaries in piezotronic ZnO bicrystals

Trapp, Maximilian ; Keil, Peter ; Frömling, Till ; Rödel, Jürgen ; Kleebe, Hans‐Joachim (2022):
Segregation and properties at curved vs straight (0001) inversion boundaries in piezotronic ZnO bicrystals. (Publisher's Version)
In: Journal of the American Ceramic Society, 103 (4), pp. 2817-2827. American Ceramic Society, ISSN 0002-7820, e-ISSN 1551-2916,
DOI: 10.26083/tuprints-00020195,
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Item Type: Article
Origin: Secondary publication service
Status: Publisher's Version
Title: Segregation and properties at curved vs straight (0001) inversion boundaries in piezotronic ZnO bicrystals
Language: English
Abstract:

TEM and SEM investigations of ZnO bicrystal interfaces were undertaken with an aim to study the correlation of local grain-boundary structure, segregation, and elec-trical transport perpendicular to the interface. To this end, varistor-like ZnO bicrystals with piezotronic characteristics were chosen with (0001)║(0001) tail-to-tail orienta-tion with respect to the c-axis. In order to contrast different local grain-boundary structures with different coherency and segregation of bismuth, but identical macro-scopic polarization state, two complementary processing techniques were applied. A diffusion-bonded bicrystal with an intermediate thin film containing Zn–Bi–Co–O provided a straight interface as reference. In contrast, a ZnO bicrystal prepared by epitaxial solid-state transformation was manufactured by bonding two ZnO single crystals with a 100 μm thick polycrystalline ZnO varistor material with a typical dopant composition including bismuth and cobalt. This structure was annealed to the point that a bicrystal was formed with the varistor concentration at the boundary, which was strongly curved due to the polycrystalline microstructure still providing a shadow image at the interface. The results highlight a distinct correlation between local interfacial morphology, degree of segregation of bismuth, and degree of non-linearity of the electrical transport across the interface.

Journal or Publication Title: Journal of the American Ceramic Society
Volume of the journal: 103
Issue Number: 4
Place of Publication: Darmstadt
Publisher: American Ceramic Society
Classification DDC: 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
Divisions: 11 Department of Materials and Earth Sciences > Earth Science > Geo-Material-Science
11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
Date Deposited: 25 Mar 2022 13:23
Last Modified: 11 Oct 2022 08:50
DOI: 10.26083/tuprints-00020195
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-201954
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/20195
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