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 r...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 （tanδ） 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.展开更多
Glasses based on Sm3+ doped zinc fluoroborate were synthesized and characterized. Formations of glasses were investigated in the 30 ZnF2-20 TeO2-(50-x)B2O3-x Sm2O3 matrix. Fast quenching and adequate heat treatment ar...Glasses based on Sm3+ doped zinc fluoroborate were synthesized and characterized. Formations of glasses were investigated in the 30 ZnF2-20 TeO2-(50-x)B2O3-x Sm2O3 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.展开更多
基金supported by a grant-in-aid for a scientific research from the Department of Atomic Energy(DAE)-Board of Research in Nuclear Science[S.No.2012/34/17/BRNS]of the Government of India
文摘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 （tanδ） 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.
基金Project supported by a grant-in-aid for a scientific research from the Department of Atomic Energy(DAE)-Board of Research in Nuclear Science(BRNS)of the Government of India
文摘Glasses based on Sm3+ doped zinc fluoroborate were synthesized and characterized. Formations of glasses were investigated in the 30 ZnF2-20 TeO2-(50-x)B2O3-x Sm2O3 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.
