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- W2736905597 abstract "Multi-component glass ceramics with composition 29PbO–5Al2O3–1TeO2 –10GeO2– (55–x) SiO2 doped with different concentrations of CuO (0 ≤ x ≤ 1.0 mol %) were synthesized by melt quenching technique and subsequent heat treatment. These glass ceramics were characterized by X–ray diffraction, scanning electron microscope, differential thermal analysis, optical absorption, electron paramagnetic resonance, Fourier transform infrared and Raman studies. The absorption spectra of these glass ceramics exhibited a broad absorption band in the range 650–950 nm which is ascribed to 2B1g → 2B2g octahedral transition of Cu2+ ions. A feeble band around 364 nm is also identified in the samples doped with CuO up to 0.6 mol% as being due to charge transfer between the two oxidation states Cu2+ and Cu+ of copper ions. The EPR spectrum recorded at room temperature exhibited a strong resonance signal at g⊥ = 2.072 and a shallow quadruplet at about gǁ = 2.401. FTIR and Raman spectra of the titled samples provide significant information about various structural units viz., silicate, germanate, PbO4, PbO6, AlO6, TeO4 and TeO3 that are present in these ceramic matrix. Analysis of the spectroscopic investigations reveals that with an increase in the concentration of CuO up to 0.6 mol% copper ions do exist in Cu2+ and Cu+ states and they act as modifiers and net work formers respectively. Therefore, glass ceramic sample contains 0.6 mol% of CuO is favorable for memory switching action." @default.
- W2736905597 created "2017-07-31" @default.
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- W2736905597 date "2017-11-01" @default.
- W2736905597 modified "2023-10-18" @default.
- W2736905597 title "Influence of valence state of copper ions on structural and spectroscopic properties of multi-component PbO–Al2O3–TeO2–GeO2–SiO2 glass ceramic system- a possible material for memory switching devices" @default.
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- W2736905597 doi "https://doi.org/10.1016/j.optmat.2017.07.040" @default.
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