CO2− radicals in synthetic hydroxyapatite View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2008-10-12

AUTHORS

I. P. Vorona, N. P. Baran, S. S. Ishchenko, V. V. Rudko, L. S. Chumakova, V. Yu. Povarchuk

ABSTRACT

Powders of the B-type synthetic apatite exposed to gamma or ultraviolet irradiation were investigated using EPR spectroscopy. It was shown that ultraviolet irradiation leads to the appearance of the EPR spectrum near g = 2, which is similar to the spectrum observed upon gamma irradiation. The decomposition of the EPR spectra into components and the simulation of the shape of the experimental EPR signals revealed that these signals are associated primarily with two types of CO2− radicals, namely, the axial CO2− radicals and the orthorhombic CO2− radicals. The differences in the shapes of the EPR spectra of the samples exposed to gamma and ultraviolet irradiation were explained by different ratios between the axial and orthorhombic CO2− radicals. It was established that thermal annealing results in an increase in the relative contribution to the total EPR spectrum. This increase was explained by the transformation of the orthorhombic radicals into the axial radicals. More... »

PAGES

1852-1856

Identifiers

URI

http://scigraph.springernature.com/pub.10.1134/s1063783408100119

DOI

http://dx.doi.org/10.1134/s1063783408100119

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1008912307


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