D. D. Ramteke; H. C. Swart; R. S. Gedam
Abstract
The role Pr 3+ ions in the lithium borate glasses have been investigated by electrochemical impedance spectroscopy technique. The glasses were prepared by conventional melt quench technique with formula 27.5 Li2O-(72.5-X) B2O3-X Pr6O11 (where, X= 0.5, 1, 1.5 and 2). It is observed that the conductivity ...
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The role Pr 3+ ions in the lithium borate glasses have been investigated by electrochemical impedance spectroscopy technique. The glasses were prepared by conventional melt quench technique with formula 27.5 Li2O-(72.5-X) B2O3-X Pr6O11 (where, X= 0.5, 1, 1.5 and 2). It is observed that the conductivity of the glasses decreases with the addition of Pr 3+ ions which was correlated with increase in the activation energy of the glasses. The observed conductivity behavior in the present study is mostly govern by the Pr 3+ as it has higher molecular weight as compared to other component in the glass system. Insight of conduction mechanism was revel by the scaling of modulus and conductivity data of the prepared samples. Scaling confirms that the conduction mechanism is compositional dependent. Based on the present study it is possible to use and modified these glasses as an insulating and dielectric material.
Promod Kumar; M. M. Ahmad
Abstract
Nanoscale silver clusters were prepared in a soda-lime glass matrix through the ion-exchange (Ag+ ↔ Na+) method followed by thermal annealing in oxidizing atmosphere. The effects of annealing time and temperature on the plasmonic response and optical properties of silver nanocluster in glass matrices ...
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Nanoscale silver clusters were prepared in a soda-lime glass matrix through the ion-exchange (Ag+ ↔ Na+) method followed by thermal annealing in oxidizing atmosphere. The effects of annealing time and temperature on the plasmonic response and optical properties of silver nanocluster in glass matrices have been investigated by using UV-visible absorption spectroscopy and photoluminescence spectroscopy. The surface plasmon resonance of silver nanoparticles has been observed in annealed samples. The blue shift has been observed as a function of post-annealing time at a constant temperature. Transmission electron micrographs show the presence of spherical nanoparticles with a maximum particle size of 4-5 nm after annealing, which is consistent with Mie theory based results. The nano-sized Ag nanocluster on glass matrix is suitable as future prospective for potential applications in optical data storage.
N.N. Ahlawat; P. Agamkar; N. Ahlawat; A. Agarwal
Abstract
The study of ternary alkali bismuth borate glasses doped with various 3d transition metals (TM) has been carried out to give more information on the oxidation states of 3d transition metal ions doped in a host of ternary alkali bismuth borate glasses. The compositional variation in density and molar ...
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The study of ternary alkali bismuth borate glasses doped with various 3d transition metals (TM) has been carried out to give more information on the oxidation states of 3d transition metal ions doped in a host of ternary alkali bismuth borate glasses. The compositional variation in density and molar volume has been investigated in terms of the structural modification that takes place in the glass matrix on introducing various 3d TM in these glasses. Analysis of FTIR spectra shows the peak positions (cm -1 ) at around 700 cm -1 corresponds to B-O-B bending while the broad peak at 900-1150 cm -1 result due to combined contributions of stretching vibrations of B-O bonds in BO3 units from pyro-orthoborate groups and stretching vibrations of B-O bonds in tetrahedral BO4 units in tri-borate, tetraborate and penta-borate groups. Another broad peak around 1300-1500 cm -1 attributes to vibrations attached to large segments of borate network.