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Electric Field-Assisted Sintering and Hot Pressing of Semiconductive Zinc Oxide: A Comparative Study

Langer, Jochen and Hoffmann, Michael J. and Guillon, Olivier (2011):
Electric Field-Assisted Sintering and Hot Pressing of Semiconductive Zinc Oxide: A Comparative Study.
In: Journal of the American Ceramic Society, pp. 2344-2353, 94, (8), ISSN 00027820, [Online-Edition: http://dx.doi.org/10.1111/j.1551-2916.2011.04396.x],
[Article]

Abstract

This study aims at comparing hot pressing (HP) and the electric field-assisted sintering (FAST, also known as spark plasma sintering, SPS) of zinc oxide. Two semiconductive nano- and submicrometer powders were investigated, with a particle size of 20–30 and 90–200 nm, respectively. Processing parameters were kept as identical as possible for both sintering methods: sample geometry, heating schedule (however affected by the temperature measurement method), applied pressure, and atmosphere. FAST and HP samples densify by grain-boundary diffusion. Zinc oxide is nevertheless very sensitive to transient overheating occurring in FAST with pyrometer temperature control, leading to different densification curves. The sintering trajectory reveals that grain size also depends on the temperature history. The electrical conductivity of ZnO dramatically increases at the sintering temperature, but not enough to affect significantly the densification behavior. Ex situ conductivity measurements do not reveal any difference between FAST and HP samples.

Item Type: Article
Erschienen: 2011
Creators: Langer, Jochen and Hoffmann, Michael J. and Guillon, Olivier
Title: Electric Field-Assisted Sintering and Hot Pressing of Semiconductive Zinc Oxide: A Comparative Study
Language: English
Abstract:

This study aims at comparing hot pressing (HP) and the electric field-assisted sintering (FAST, also known as spark plasma sintering, SPS) of zinc oxide. Two semiconductive nano- and submicrometer powders were investigated, with a particle size of 20–30 and 90–200 nm, respectively. Processing parameters were kept as identical as possible for both sintering methods: sample geometry, heating schedule (however affected by the temperature measurement method), applied pressure, and atmosphere. FAST and HP samples densify by grain-boundary diffusion. Zinc oxide is nevertheless very sensitive to transient overheating occurring in FAST with pyrometer temperature control, leading to different densification curves. The sintering trajectory reveals that grain size also depends on the temperature history. The electrical conductivity of ZnO dramatically increases at the sintering temperature, but not enough to affect significantly the densification behavior. Ex situ conductivity measurements do not reveal any difference between FAST and HP samples.

Journal or Publication Title: Journal of the American Ceramic Society
Volume: 94
Number: 8
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 19 Aug 2011 10:36
Official URL: http://dx.doi.org/10.1111/j.1551-2916.2011.04396.x
Identification Number: doi:10.1111/j.1551-2916.2011.04396.x
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