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A frequency response and transient current study of beta-Ta2O5: Methods of estimating the dielectric constant, direct current conductivity, and ion mobility
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för materialvetenskap.ORCID-id: 0000-0002-5496-9664
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för materialvetenskap.ORCID-id: 0000-0002-8279-5163
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för materialkemi, Oorganisk kemi.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för materialkemi, Oorganisk kemi.
1999 (engelsk)Inngår i: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 85, artikkel-id 2185Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Dielectric ac measurements in the frequency range of ∼1 mHz–1 MHz were performed on β-Ta2O5 samples made by chemical vapor deposition. A method of estimating the dielectric constant and the dc conductivity from the dielectric response was developed. The high-frequency dielectric constant was found to be 25.84 with no detectable temperature dependence and the dc conductivity due to protons had an activation energy of about 0.4 eV in the studied temperature range (from 24 to 90 °C). Evidence for the conduction mechanism being protonic rather then electronic was found from isothermal transient ionic current (ITIC) measurements. The ITIC recordings could also determine conduction parameters, such as protonmobility, number of charge carriers, and dc conductivity.

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1999. Vol. 85, artikkel-id 2185
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URN: urn:nbn:se:uu:diva-84848DOI: 10.1063/1.369525OAI: oai:DiVA.org:uu-84848DiVA, id: diva2:112756
Merknad

Erratum in Journal of Applied Physics, 1999, vol. 86, article id 2926, DOI: 10.1063/1.371432

Tilgjengelig fra: 2008-10-17 Laget: 2008-10-17 Sist oppdatert: 2017-12-14bibliografisk kontrollert

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