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Reddy, G. Naga Koti; Sekhar, A. Venkata; Pavić, L.; Bafti, A.; Pisk, Jana; Reddy, A. Siva Sesha; Venkatramaiah, N.; Raju, G. Naga; Kumar, V. Ravi; Veeraiah, N.
Applied physics. A, Materials science & processing, 03/2023, Letnik: 129, Številka: 3Journal Article
Zinc selenium phosphate glasses added with the traces of Au 2 O 3 were prepared and heat-treated. XRD, TEM, DSC, FT-IR and optical absorption (OA) spectroscopy methods were used for the structural assessment of these samples. Later, different dielectric parameters viz., dielectric constant ( ε′ ), electric moduli ( M ), impedance ( Z ) and a.c. conductivity ( σ ac ) were measured over wide regions of frequency ( ω ) and temperature ( T ) as functions of Au 2 O 3 concentration. Dielectric breakdown strength (DBS) of these samples was also measured at ambient conditions. The characterization studies indicated that multiple crystal grains were entrenched in the residual amorphous phase of the samples. The X-ray diffraction studies revealed that the bulk glasses consisted of Au 2 (SeO 3 ) 3 crystal phase and Au 0 metallic particles (MPs). As Au 2 O 3 content was raised, the intensity of the XRD peak related to Au 3+ crystal phase indicated a growing trend, whereas that of Au 0 MPs showed a decreasing trend. The results of XPS studies revealed similar inferences. The FT-IR results pointed out an improved degree of augmentation of the glass network as the content of Au 2 O 3 was increased. Optical absorption (OA) - spectra of the glasses indicated a broad absorption band in the spectral range of 500–600 nm due to the surface plasmon resonance (SPR) of Au 0 MPs. The intensity of the band was observed to decrease as Au 2 O 3 content was increased and indicated decreasing proportion of Au 0 metallic particles in the samples. The dielectric parameters exhibited a decreasing trend, whereas the dielectric breakdown strength (DBS) and electrical impedance indicated a substantial hike due to the increasing concentration of Au 2 O 3 . Overall, the presence of Au 2 O 3 caused a significant improvement in the insulating strength of the ZnO added SeO 2 -P 2 O 5 glasses and hence such glasses may be considered as insulating layers in the display panel devices.
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