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Influence of high temperature annealing on the dielectric properties of alumina films prepared by the aerosol deposition method

Title data

Leupold, Nico ; Schubert, Michael ; Kita, Jaroslaw ; Moos, Ralf:
Influence of high temperature annealing on the dielectric properties of alumina films prepared by the aerosol deposition method.
In: Functional Materials Letters. Vol. 11 (2018) Issue 2 . - Art.Nr. 1850022.
ISSN 1793-7213
DOI: https://doi.org/10.1142/S1793604718500224

Project information

Project title:
Project's official titleProject's id
No informationAZ-1055-12

Project financing: Bayerische Forschungsstiftung

Abstract in another language

The aerosol deposition method (ADM) is a novel coating technique that allows to fabricate dense and nanocrystalline ceramic films at room temperature. To investigate the dielectric properties of aerosol deposited alumina films at high temperatures and the influence of annealing on them, the temperature was increased in steps of 100°C from 200°C to 900°C and subsequently cooled down stepwise again. At each step, the dielectric properties were measured by impedance spectroscopy between 50mHz and 200kHz. During the heating steps, the relative permittivity and also the loss tangent showed a disordered behavior with various maxima in the loss tangent. After reaching 900°C, during cooling, the behavior was more ordered, and the loss tangent exhibited only one maximum that appeared at lower frequencies. Overall, the annealing reduces the loss tangent at low frequencies and low temperatures. The origin of this behavior could lie in the annealing of defects, which are incorporated into the layer when the particles hit the surface of the substrate and crack while being deposited via ADM following the room temperature impact consolidation mechanism (RTIC).

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Functional Materials > Chair Functional Materials - Univ.-Prof. Dr.-Ing. Ralf Moos
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions > Research Centres > Bayreuth Center for Material Science and Engineering - BayMAT
Faculties
Faculties > Faculty of Engineering Science > Chair Functional Materials
Profile Fields
Profile Fields > Advanced Fields
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 23 May 2018 08:54
Last Modified: 23 May 2018 08:54
URI: https://eref.uni-bayreuth.de/id/eprint/44319