Issue 6, 2000

EPR and ENDOR studies on CO2 radicals in γ-irradiated B-type carbonated apatites

Abstract

A gamma-irradiated synthetic B-type carbonated apatite calcined at 300°C was studied by EPR and ENDOR. The room temperature EPR spectrum is composed of an axially symmetric species (g=2.0025 and g=1.9971) attributed to rotating CO2 radicals. At low temperatures (T<10 K), the CO21H and 31P ENDOR spectra were obtained for different magnetic field settings. Computer simulations of these ENDOR spectra, based on the ‘‘molecular orientation–selection’’ principle, enabled one to allocate the CO2 radicals in the carbonated apatite lattice. It was established that the CO2 radicals are located on PO43− sites with a vacancy on the nearest OH site. In addition, discussions related to the substitution mechanisms and the nature of the precursors of the CO2 radicals are presented.

Article information

Article type
Paper
Submitted
23 Nov 1999
Accepted
24 Jan 2000
First published
01 Mar 2000

Phys. Chem. Chem. Phys., 2000,2, 1339-1343

EPR and ENDOR studies on CO2 radicals in γ-irradiated B-type carbonated apatites

D. U. Schramm and A. M. Rossi, Phys. Chem. Chem. Phys., 2000, 2, 1339 DOI: 10.1039/A909269B

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