Akshatha Wagh

Composition dependent structural and optical properties of PbF2–TeO2–B2O3–Eu2O3 glasses

Boric oxide based quaternary glasses in the system PbF2-TeO2-B2O3-Eu2O3 have been prepared by melt quenching technique. Density, molar volume, FTIR, UV-Vis techniques were used to probe the structural modifications with incorporation of europium ions in the glass network. An increase in glass density & decrease in molar volume (Vm) values proved the structural changes occurring in coordination of boron atom [conversion of BO3 units to BO4]. This resulted in the increase of the compaction of the prepared glasses with increase in Eu2O3 contents. The amorphous natures of the samples were ascertained by XRD and metallization criterion (M) studies. XPS study showed the values of core-level binding energy [O1s, Eu3d, Eu4d, Te3d, Te4d, Pd4f, Pb5d, O1s, and F1s] of (PbF2-TeO2-B2O3-Eu2O3) the glass matrix. The frequency and temperature dependence of dielectric properties of present glasses were investigated in the frequency range of 1 Hz-10 MHz and temperature range of 313-773K. The study of dielectric measurements proved good insulating and thermal stability of the prepared glasses. At room temperature, dielectric loss [tanδ] values were negligibly small for prepared glasses and increased with increase in temperature. FTIR spectroscopy results were in good agreement with optical band energy gap, density, molar volume and hardness values revealing network modifications caused by europium ions in the glass structure.

Dielectric properties and relaxation dynamics in PbF2-TeO2-B2O3-Eu2O3 glasses

Abstract Frequency and temperature dependent dielectric dispersion of 20PbF2-20TeO2-(60-x)B2O3-xEu2O3(x=0 to 2.5, mole fraction, %) glasses prepared by the melt-quenching technique were investigated in the frequency range 1 Hz-10 MHz and temperature range 313–773 K. Dielectric relaxation dynamics was analyzed based on the electric modulus behavior. Dielectric losses (tan δ) are found to be negligibly small in the temperature range 313-523 K, proving good thermal stability of the glasses. The present Eu2O3-doped oxyfluroborate glasses showed low dielectric loss at higher frequency and lower temperature, proving their suitability for nonlinear optical materials.

Effect of Sm2O3 on structural and thermal properties of zinc fluoroborate glasses

Abstract Glasses based on Sm3+ doped zinc fluoroborate were synthesized and characterized. Formations of glasses were investigated in the 30ZnF2–20TeO2–(50–x)B2O3–xSm2O3 matrix. Fast quenching and adequate heat treatment are required to prevent melt crystallization and to diminish thermal stress, which result in an efficient amorphous material. The differential scanning calorimetry (DSC), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDAX), X-ray photoelectron spectroscopy (XPS) were employed to record, calculate, measure and analyze the stability, density and refractive index of the glass samples with different concentrations of Sm3+ ranging between 0 to 2.5% (mass fraction). XPS result shows the values of core-level binding energy (Zn 3s, Sm 4d, Te 3d, B 1s, O 1s and F 1s) of (ZnF2–TeO2–B2O3–Sm2O3) glass matrix and indicates the good fusibility of the present glass samples. Density of the glass samples increases as dopant concentration increases and glass transition temperature tg ranges between 395 °C and 420 °C.

Physical and optical properties of Pr6O11doped zinc fluoroborate glass

Praseodymium (Pr3+) doped zinc fluoroborate glasses with the chemical composition [(mol%)30ZnF2–20TeO2–(50-x)B2O3–xPr6O11] (where x = 0.0, 0.1, 0.5, 1.0 and 1.5 mol %) have been prepared by conventional melt quenching technique. The physical and optical parameters like density, refractive index, molar volume, and oscillator strength of these glasses were calculated as a function of dopant concentration. The densities and refractive indices of these glasses were found to be in the range 2 g/cm3 - 2.67 g/cm3 and 1.644 – 1.73 respectively. Stability of glass doped with 1 mol % of Pr3+ was found to be 120.

Physical and optical properties of Pr[sub 6]O[sub 11] doped zinc fluoroborate glass

Praseodymium (Pr3+) doped zinc fluoroborate glasses with the chemical composition [(mol%)30ZnF2–20TeO2–(50-x)B2O3–xPr6O11] (where x = 0.0, 0.1, 0.5, 1.0 and 1.5 mol %) have been prepared by conventional melt quenching technique. The physical and optical parameters like density, refractive index, molar volume, and oscillator strength of these glasses were calculated as a function of dopant concentration. The densities and refractive indices of these glasses were found to be in the range 2 g/cm3 - 2.67 g/cm3 and 1.644 – 1.73 respectively. Stability of glass doped with 1 mol % of Pr3+ was found to be 120.

Physical and optical properties of Pr6O11 doped zinc fluoroborate glass

Praseodymium (Pr3+) doped zinc fluoroborate glasses with the chemical composition [(mol%)30ZnF2–20TeO2–(50-x)B2O3–xPr6O11] (where x = 0.0, 0.1, 0.5, 1.0 and 1.5 mol %) have been prepared by conventional melt quenching technique. The physical and optical parameters like density, refractive index, molar volume, and oscillator strength of these glasses were calculated as a function of dopant concentration. The densities and refractive indices of these glasses were found to be in the range 2 g/cm3 - 2.67 g/cm3 and 1.644 – 1.73 respectively. Stability of glass doped with 1 mol % of Pr3+ was found to be 120.

Optical properties of Eu2O3 doped lead fluoroborate glass

A series of Lead Fluoroborate glasses having composition (mol%) 20 PbF2 - 20 TeO2 - (60-x) B2O3 - xEu2O3 were prepared by doping with different concentration of rare earth element Europium (Eu3+) using the normal melt-quench technique (with x = 0.0, 0.1, 0.5, 1.0, 1.5, 2.0 and 2.5 mol%). The physical parameters like mass density, refractive index, number density, molar refraction, electronic polarizability of theses glasses were found as a function of dopant concentration. The absorption spectra of these glasses were recorded in the UV-VIS range. No sharp edges were found in the spectra, which verify the amorphous nature of theses glasses.