Mössbauer effect forFe57andCo57in TiO2(rutile)

Ti${\mathrm{O}}_2$ (rutile) powder has been doped with 1-at.% ${}_{}{}^{57}{}_{}{}^{}\mathrm{Fe}$ for Mössbauer source studies, and with Co (${}_{}{}^{57}{}_{}{}^{}\mathrm{Co}$) in the percent and parts per million (ppm) ranges for Mössbauer source studies. The absorber and percent sources show simple trivalent iron spectra, with quadrupole splittings of 0.70 and as large as 0.15 mm/sec, respectively. The ppm ${}_{}{}^{57}{}_{}{}^{}\mathrm{Co}$ sources are more complex, exhibiting three different spectra, all showing quadrupole interactions and all probably divalent. Possible configurations corresponding to these spectra are discussed and the results compared to EPR data.