Objectives: To study gamma ray irradiation effect on dielectric and AC conductivity of V 2 O 5 doped bismuth borate glasses designed with the compositions 50B 2 O 3 -(50-X)Bi 2 O 3 -XV 2 O 5 where, X = 0, 0.2, 0.4, 0.6, 0.8, 1.0 and establishing the conduction mechanism. Methods: Glasses were synthesized by traditional melt quenching technique at 1323K. The prepared samples were subjected to annealing at 623K, which helps to remove strain in the samples. Absence of crystalline phases in the samples was confirmed by X-ray diffraction studies. An independent measurement of dielectric constant, dielectric loss and AC conductivity was carried out for temperature range from 300Kto 493K by impedance analyzer. Findings: The physical properties of glass were achieved by studying the density and the molar volume. Dielectric constant (ε') and dielectric loss (ε") were measured as a function of temperatures in the range from 300K to 493K, over the frequencies 10 2 Hz -10 6 Hz before and after gamma ray irradiation. AC conductivity (σ AC ) of the glasses was measured as a function of frequency for different temperatures before and after gamma ray irradiation. Novelty: For the first time, it was attempted that the effect of gamma ray irradiation on dielectric and AC conductivity properties of bismuth-borate glasses doped with vanadium oxide has been investigated. Here we have observed the change in the variation of dielectric constant, dielectric loss and AC conductivity with frequency and temperature before and after gamma ray irradiation. The borate network becomes more compact after being exposed to gamma rays, and the energy band gap may even narrow. Furthermore, it has been found that the composition of the glass influences how radiation impacts conductivity.
Objectives: To investigate the effect of B 2 O 3 replaced by Nd 2 O 3 studies on the spectroscopic characteristics of trivalent neodymium (Nd 3+ )-doped glasses using XRD, FTIR, absorption, and emission spectroscopy. Methods: The glasses were synthesized using the conventional melt quenching technique at 1150 0 C. The amorphous nature of the samples was confirmed by x-ray diffraction studies. Findings: The addition of Nd 2 O 3 concentration affects the absorption and emission properties of the Nd 3+ ion measured in the near-infrared luminescence range from 0.9µm, 1.06 µm, and 1.36µm associated with the 4 F 3/2 → 4 I J (J = 9/2, 11/2, 13/2) transitions. Novelty: The novelty of the present work is to fully understand and characterize the luminescence of Nd 3+ doped borate bulk glasses with different doping concentrations. So as to gain an insight of 1.06 µm corresponding to 4 F 3/2 → 4 F 11/2 transition, these glasses are highly potential one which is an applicable to NIR emitting solid state device.
Background/Objectives: 23CaO + 10Al 2 O 3 + (51 − x)B 2 O 3 + 6BaF 2 + 10Na 2 O + xNd 2 O 3 glasses were designed for understanding the optical properties of the emission, such as absorption, lifetime, and quantum efficiencies (QEs) of the glasses. Methods: The glasses were synthesized using the conventional melt-quenching technique at 1150 0 C. The amorphous nature of the samples was confirmed by x-ray diffraction studies. Findings: The radiative QE (η) obtained from the radiative lifetime by Judd-Ofelt analysis, as well as directly measured lifetime using a 582 nm were measured and compared with other reported literature. Novelty: The present work focuses on the replacement of fluorine ions to their alkali content and studied their stimulated emission cross section. The stimulated emission cross-section shows σ emi =25.3x10 -21 cm 2 and σ emi =18.5x10 -21 cm 2 for oxide (R1) and oxy-fluoride glasses (F2) with 0.5mol% Nd 2 0 3 content respectively. The stimulated emission cross section σ emi =29.9x10 -21 cm 2 and σ emi =32.5x10 -21 cm 2 for oxide (F1) and oxy-fluoride (A3) glasses with 1.0mol% Nd 2 0 3 content respectively. The data clearly suggests that addition of higher fluorine content in the glasses are suitable for NIR solid state device applications.
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