Paramagnetic defects induced by ion implantation in oxide glasses

Origins of optical absorption between 4.8 and 4.9eV in silica implanted with Si and with O ions

“…But, in keeping with scientific rigor, it should be added that the issue on the identification of the O À 3 ion, viz. regarding the so-called O À 3 complexes and anomalous O À 3 ions, is not quite satisfactory yet [30,31]. So, we conclude that the atomic source of the OS signal is unknown.…”

“…From previous works and compilations [30,31], a first general observation appears that most O-associated defects can be excluded as viable candidates since they generally have principal g-values with at least one g-value much larger than those inferred for the OS signal. Based on the principal values of the g-matrix, for example, it is impossible to assign the OS center to the interstitial ozonide O À 3 ion (g 1 = 2.018, g 2 = 2.011, g 3 = 2.002) as observed by Griscom and Friebele [32] in high-potassium content SiO 2 .…”

Paramagnetic Species in Ion Implanted Phosphate Glasses

“…To our knowledge, EPR spectra of TM ions implanted into oxide glasses of more complex compositions were studied a little. At the same time paramagnetic structural defects induced by ion implantation in oxide glasses, including phosphate glasses, have been studied [9][10][11][12][13] Figure 3 shows optical spectra of the sample 45CaO-55 P2O5. The absorption bands (spectrum 1) at 370, 460 and 730 nm are seen.…”

Catalytic properties of beta zeolite exchanged with Pd and Fe for toluene total oxidation

“…It should be noted that identification of the narrow symmetric line with g-=ge is difficult, but Lorentian shape of signal indicates the exchange interaction between the corresponding paramagnetic species. In our case taking into account the condition of reduction treatment and composition of studied solids, it should be the oxygen located hole for corresponding defect centres [10]. It must be noted that the increase of number of S centres is in inverse proportion to quantity of agglomerated B centres (iii), i.e.…”