Electron spin resonance in phosphate glasses containing mixed transition metal ions

Electrical conduction in copper phosphate glasses containing nickel or cobalt

“…In our electron spin resonance (ESR) results [1] for copper phosphate glasses containing nickel or cobalt, it was suggested that the reduction in the intensity of the ESR signal .of the Cu 2+ ions may be due to an oxidation-reduction mechanism between two valency states of the two different transition metals. In the present work we report the electrical conductivity of the same glasses.…”

“…Many recent investigations have been reported concerning oxide glasses containing two TM oxides simultaneously [1][2][3][4][5][6][7][8][9][10]. Sayer and Lynch [3], Caley and Murthy [4], Bogomolova et al [5] and Chomka et al [6] all reported an initial decrease and then an increase in conductivity, whereas Bogomolova and Glassova [8] and Singh [9] reported an initial increase and then a decrease in conductivity, when one TM oxide is replaced by other TM oxides in glasses.…”

“…Copper phosphate glasses containing nickel or cobalt were prepared as described by Harani et al [1]. For electrical measurements annealed samples were ground and then polished using conventional abrasives.…”

Some studies of the optical properties of copper phosphate glasses containing praseodymium

“…From the figure it is clear that there are no sharp absorption edges, and this is a characteristic of most glassy oxide materials including transition metal ion phosphate glasses [14,15]; there are no absorption peaks just beyond the edge in copper phosphate glass doped with 1 mol % Pr6OH, and this may be due to the high percentage of copper in the glass. However, an absorption at 850 nm due to Cu 2 § is observed for copper phosphate glass (Curve 1) [4,16] and this disappears as the glass is increasingly doped with Pr60 H . It is clear that the fundamental optical absorption edge of glass doped with Pr6Ojl is sharp as for cerium phosphate glass [11] rather than the usual copper phosphate glass, but it is not as sharp as reported for the higher percentages of Pr6Oit in praseodymium phosphate glasses [13].…”

Sulfur-enhanced thermoluminescence of γ-radiated zirconia

“…Given the very high thermal, electrical, and mechanical stability of zirconia, its use for dosimetry of ionozing radiation seems extremely attractive, as most commercially available dosimeters are made out of rather weak materials, mainly alkaly halides [12][13][14][15], which can also become an environmental hazard, when disposed, whereas zirconia is currently employed for bioengineered devices in situ.…”