Characterization of Pr6O11-Ag2o-B2O3 Glasses

Silver borate glasses doped with Praseodymium of different concentration has been prepared by melt quench technique. X-ray diffraction pattern shows that there is no sharp peak it confirms the amorphous nature of the present glasses. The glass transition temperature (Tg) of this glass system have been studied using the Matac MBS-8000 Digital Signal Processing and Conventional Thermal Analysis (DTA) method. The Tg of these glasses increases with increase in concentration of Pr6O11 except at 0.2 mol%Tg value is lower. We investigate the network structure of Pr6O11-Ag2O-B2O3 glass by 11B magic angle spinning (MAS)-nuclear magnetic resonance (NMR) which shows the presence of sharp peak at around 18 ppm. Formation of B4 units is assumed to be occurring initially through the formation of oxygen bridges between [BO3/2]0 units in B2O3

Synthesis and structural studies of praseodymium doped silver borate glasses

Praseodymium doped silver borate glasses with nominal composition xPr 6O11-(25-x)Ag2O-75B2O3 (x=0, 1, 2, 3, 4, 5) were prepared by melt quench technique. XRD pattern shows that there is no sharp peak it confirms the amorphous nature of the present glasses. The glass transition temperature (Tg) of this glass system have been studied using the Matac MBS-8000 Digital Signal Processing and Conventional Thermal Analysis (DTA) method. The Tg of these glasses increases with increase in concentration of Pr6O11 except at 0.2 mol, Tg value is lower. 11B MAS-NMR shows the presence of sharp peak around 0.306 ppm. Chemical shift of these glasses decreases with mol of rare earth oxide. FTIR spectra recorded in the region of 400 to 4000 cm-1. This studies revealed that the progressive addition Ag2O and Pr6O11 leads to modification of B2O3 into BO4 groups. Raman measurements of these glasses support the proposed interpretations of the experimental results. © 2013 American Institute of Physics

Electrical properties of praseodymium oxide doped Boro-Tellurite glasses

Glasses of the composition xPr6O11- (35-x)TeO2-65B2O3 (x=0, 0.1 to 0.5 mol %) have been prepared using the melt quenching method. The ac and dc conductivity of glass have been measured over a wide range of frequencies and temperatures. Experimental results indicate that the ac conductivity depend on temperature, frequency and Praseodymium content. The conductivity as a function of frequency exhibited two components: dc conductivity (σdc), and ac conductivity (σ ac ). The activation energies are estimated and found to be decreases with composition. The impedance plot at each temperature appeared as a semicircle passes through the origin

Ionic conductivity of praseodymium doped silver-borate glasses

Glasses of the composition xPr6O11–(35 − x) Ag2O–65B2O3 (x = 0, 0.1–0.5 mol%) have been prepared using the melt quenching method. The ac and dc conductivity and dielectric properties of glass have been measured over a wide range of frequencies and temperatures. Experimental results indicate that the ac conductivity and the dielectric constants depend on temperature, frequency and praseodymium content. The conductivity as a function of frequency exhibited two components: dc conductivity (σdc), and ac conductivity (σac). The activation energies are estimated and discussed. The impedance plot at each temperature appeared as a semicircle passes through the origin. In all the samples, only one semicircle has been observed over the entire range of temperature studied indicating only one type of conduction mechanism