研究目的
To study the composition and polarization dependence of the vibrational and elastic properties of the pseudo-binary mixed fluoride-phosphate glass-forming system and to establish a possible link between the Boson peak and transverse phonons.
研究成果
The incorporation of phosphate groups into the fluoride network results in a less interconnected structure with reduced rigidity. The Boson peak frequency shows strong linear dependencies on molar volume and shear modulus, and its intensity is inversely proportional to shear modulus, indicating a transverse vibrational origin. This supports existing theories linking the Boson peak to transverse phonons in glasses.
研究不足
The study is limited to specific fluorophosphate glass compositions; devitrification occurs for certain compositions (0.45<x<0.75), limiting the range. Assumptions were made, such as equal Raman cross-sections for Qi species, which may not hold. The Raman coupling coefficient C(ω) is unknown, preventing exact vibrational density of states calculation. The findings may not generalize to other glass systems.
1：Experimental Design and Method Selection:
The study employed vibrational (Raman and IR) and ultrasonic spectroscopies to investigate the structural and elastic properties of fluorophosphate glasses. Theoretical models and fitting procedures (e.g., log-normal function for Boson peak analysis) were used.
2：Sample Selection and Data Sources:
Glass samples with compositions xSr(PO3)2-(1-x)(
3：62MgF2-38AlF3) for x values 0 to 1 were prepared using high-purity materials and melt-quenching technique. Data were collected at room temperature. List of Experimental Equipment and Materials:
Equipment includes X-ray diffractometer (Philips X'Pert MPD), ultrasonic transducers (Olympus NDT), signal generator (TTi TGR-1040), digital oscilloscope (Tektronix TBS1152B), Raman spectrometer (Jobin-Yvon T-64000), Argon-ion laser (Spectra Physics), CCD detector, FTIR spectrometer (Bruker Alpha) with ATR accessory, and materials like Sr(PO3)2, MgF2, AlF3, NH4HF2, ethanol, CCl
4：Experimental Procedures and Operational Workflow:
Glasses were prepared by melting and quenching, characterized by XRD for amorphous nature, densities measured by Archimedes method, ultrasonic velocities measured using pulse-echo method, Raman and IR spectra recorded with specific geometries and parameters, and data analyzed using fitting procedures.
5：Data Analysis Methods:
Spectral fitting with Voigt profiles, calculation of reduced representations, correlation analyses (e.g., Pearson's coefficient), and estimation of properties like Debye temperature and shear modulus.
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