Gamma ray interactions with V2O5-doped sodium phosphate glasses

Physical properties and electrochemical performance of molybdenum–lead-germanate glasses and glass ceramics

“…Smaller absorption band located at about 320 nm can be related to Mo 3 þ ions [5,6], in agreement with the EPR data. A highly possible mechanism can be summarized as follows:…”

“…7 6 ] structural units are highly deformed. In brief, there is a larger displacement of the germanium atom from the center of the square pyramidal and octahedral geometry.…”

“…Moreover, glasses containing molybdenum ions have interesting optical and electrical properties depending on the type and composition of glass and the different valence states of molybdenum ions [3]. Such peculiar properties are related to the ability of molybdenum ions to exist in glasses in four possible valences, namely Mo 3 þ , Mo 4 þ , Mo 5 þ and Mo 6 þ [4][5][6]. The conductivity process in transition metal ion glasses, such as Mo, V, etc.…”

“…The electrical conduction can take place by a transfer of electrons from Mo 5 þ to Mo 6 þ ions [4]. The Mo 6 þ ions participate in the glass network within the [MoO 4 ] and [MoO 6 ] structural units while the Mo 5 þ ions act as modifiers. These mixed ionicelectronic conductor glasses have become a current topic mainly in applications such as electrochemical cells, highdensity memories, smart windows, electro-optical and electrochromic devices [11,12].…”

“…It is possible that the number of [GeO 6 ] structural units to attain maximum value, in agreement with density value and with the increase of intensity of the IR band located at about 700 cm À 1 . Noticeable changes appear in the intensity of the UV-vis bands centered at about 310 nm which corresponds to the Pb 2 þ ions with s 2 configuration and also in the intensity of the bands located in the region between 450 and 580 nm which can be related to Mo 4 þ ions[5,6]. On the other hand, the decrease in intensity of the EPR resonance line located at about g$ 5.2 is related to the oxidation of some Mo 3 þ ions into Mo 4 þ ions.…”