Vibrational Spectroscopic Studies of Germanium-High Bismuthate Glasses and Vitroceramics
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Oana Ponta
Abstract
Bi2O3-rich glasses belonging to the system xGd2O3(1−x)[0.857Bi2O3·0.143GeO2] with 0.005≤x≤0.1, have been obtained by rapid cooling of the melts. Polycrystalline samples have been further obtained by applying a heat treatment at 600ºC for 24 h. Both types of samples were structurally characterized by using X-ray diffraction (XRD), and infrared (IR) and Raman spectroscopic techniques.
Local structural units for the investigated samples are identified on the basis of vibrational spectroscopic data. The obtained data reveal the presence of GeO4, GeO6, BiO3 and BiO6 groups as basic structural units of the networks. For the vitroceramic samples some changes occur in their network, mainly reflecting the presence of an ordered structure, but much important is that part of the BiO6 structural units from Bi2O3-GeO2 glass network are converting into BiO3 units. The IR and Raman results support the idea that the local structure of the glasses and vitroceramics is less affected by the presence of Gd3+ ions but there is strong long range order influence on developed crystalline phases from vitroceramic samples, as proved by XRD. However, the spectral analyses reveal the formation of a structure with a higher disorder degree for x=0.1 in comparison with the other investigated vitroceramics as a result of the partial replacement of the Bi3+ ions with Gd3+ ions. Starting from the Bi12GeO20 sellenite phase in the samples with low gadolinium content (x≤0.01), the structure is change to Bi24GeO38 phase, via a BiLa type structure, when the Gd2O3 concentration is increasing up to x=0.1.
© by Oldenbourg Wissenschaftsverlag, München, Germany
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- Vibrational Spectroscopic Studies of Germanium-High Bismuthate Glasses and Vitroceramics
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- Threshold Photoelectron Spectrum of Isolated NTCDA
- Study of Hydrogen Bonding Patterns of a Pharmaceutically Active Drug Molecule Paraldehyde: a Raman and DFT Study
- Femtosecond Coherence Spectroscopic Study of the Onset of Chemical Denaturation of Myoglobin upon Addition of Minor Amounts of Urea
- Checking and Improving Calibration of Raman Spectra using Chemometric Approaches
- The Influence of Short-Day Photoperiods on Bone Composition of Hamsters: a Raman Spectroscopic Investigation
- Shell-Isolated Nanoparticle-Enhanced Raman Spectroscopy (SHINERS) Based on Gold-Core Silica-Shell Nanorods
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Articles in the same Issue
- Preface – The Many Facets of Raman Spectroscopy
- Vibrational Spectroscopic Studies of Germanium-High Bismuthate Glasses and Vitroceramics
- SERS Study and DFT Simulation of the Interaction of Cytosine with Copper Electrode
- Precise Analysis of Small Wavenumber Shift of Pyridine on Dilution with H2O and D2O Using RDS Technique
- Deep UV Resonance Raman Spectroscopy with a Tunable 4 kHz Nanosecond Solid-State Laser and a 1 mL Circulating Free-Flow System
- Interference Effects in Vibronic 2D-Spectra of Diatomic Molecules
- Threshold Photoelectron Spectrum of Isolated NTCDA
- Study of Hydrogen Bonding Patterns of a Pharmaceutically Active Drug Molecule Paraldehyde: a Raman and DFT Study
- Femtosecond Coherence Spectroscopic Study of the Onset of Chemical Denaturation of Myoglobin upon Addition of Minor Amounts of Urea
- Checking and Improving Calibration of Raman Spectra using Chemometric Approaches
- The Influence of Short-Day Photoperiods on Bone Composition of Hamsters: a Raman Spectroscopic Investigation
- Shell-Isolated Nanoparticle-Enhanced Raman Spectroscopy (SHINERS) Based on Gold-Core Silica-Shell Nanorods
- Fourier Transform Raman and DFT Study of Blue Shift C–H Stretching Vibration of Diazines on Hydrogen Bond Formation
