Oscillatory variation in EMF developed due to additions of TiO2 pretreated thermally and γ-irradiated to various doses in the concentration cell made up of Ag/Ag+

L. Bapat; J. Ramanan

doi:10.1007/bf02162044

Journal of Radioanalytical and Nuclear Chemistry

Volume/Issue:: Volume 119: Issue 5

Oscillatory variation in EMF developed due to additions of TiO₂ pretreated thermally and γ-irradiated to various doses in the concentration cell made up of Ag/Ag⁺

Authors:

L. Bapat

L. Bapat N. Wadia College Department of Chemistry 411 001 Pune India

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J. Ramanan

J. Ramanan N. Wadia College Department of Chemistry 411 001 Pune India

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Pages:: 333–345

Online Publication Date:: 27 Sep 2005

Publication Date:: 17 Dec 1987

Article Category:: Research Article

DOI:: https://doi.org/10.1007/bf02162044

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Abstract

Several powder samples of TiO₂ are pretreated thermally at 300, 480 and 540°C, subjected to -irradiation and after irradiation added in one of the compartment of the concentration cell made up of Ag/Ag⁺. The adsorbed oxygen species O _2ad^– , HO _2ad^– and O _ad^– on TiO₂ provide negatively charged sites and develop EMF in the cell. The radiation damage, measured in terms of equilibrium EMF, received at lower doses is partially recovered at higher doses. It is proposed that in heating at 480°C, ad species react with Ti³⁺ ions in the surface and produce –O–O– peroxy linkages and block the negatively charged sites while in heating at 540°C Ti₄O₇ phase is produced on the surface which adsorbs O₂ and provide large number of negatively charged sites. During -irradiation peroxy linkages are broken and the Ti₄O₇ phase is destroyed. Observed oscillatory variation in equilibrium EMF is explained on the basis of several reactions mentioned above proceeding at different rates during radiolysis.

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Journal of Radioanalytical and Nuclear Chemistry

Print ISSN:: 0236-5731

Online ISSN:: 1588-2780

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Journal of Radionalytical and Nuclear Chemistry
Language	English
Size	A4
Year of Foundation	1968
Volumes per Year	1
Issues per Year	12
Founder	Akadémiai Kiadó
Founder's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher	Akadémiai Kiadó Springer Nature Switzerland AG
Publisher's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible Publisher	Chief Executive Officer, Akadémiai Kiadó
ISSN	0236-5731 (Print)
ISSN	1588-2780 (Online)