研究目的
Investigating the crystallization and spectroscopic characterizations of binary SrO-B2O3 glasses doped with LiF, NaF, CaF2, or TiO2, including their structural, optical, and thermal properties, and the formation of crystalline phases in glass-ceramics.
研究成果
The study successfully characterized the structural, optical, and thermal properties of doped SrO-B2O3 glasses and their glass-ceramics. FTIR confirmed the presence of borate units, with dopants having minimal impact at low concentrations. Crystallization behavior varied with dopant type, influencing phase formation. Thermal expansion properties were affected by network structure and dopant role. UV absorption was attributed to iron impurities. Future work could explore higher dopant levels or different heat treatments.
研究不足
The low dopant level (2%) did not cause significant variations in IR spectra, limiting the detection of structural changes. The study is constrained to specific compositions and dopants, and the presence of iron impurities may affect optical properties. The heat treatment regime is fixed, which might not optimize crystallization for all samples.
1：Experimental Design and Method Selection:
The study involved synthesizing glasses using a melting and annealing technique, followed by controlled heat treatment for crystallization. Methods included FTIR spectroscopy, X-ray diffraction, SEM, thermal expansion measurements, and optical absorption spectroscopy to analyze structural, thermal, and optical properties.
2：Sample Selection and Data Sources:
Glasses were prepared with a base composition of 50 mol% SrO and 50 mol% B2O3, doped with 2 wt% of LiF, NaF, CaF2, or TiO2. Raw materials included orthoboric acid (H3BO3), strontium carbonate (SrCO3), and the dopants.
3：Raw materials included orthoboric acid (H3BO3), strontium carbonate (SrCO3), and the dopants.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment included a SiC-heated furnace (Vecstar, UK) for melting, a computerized dilatometer (NETSCH, 402 PC, Germany) for thermal expansion, an FTIR spectrometer (JASCO-FTIR-4600, Japan), an X-ray diffractometer (Phillips PW-1390), an SEM (JEOL-840 A with EDAX unit), and a spectrophotometer (JASCO V-630, Japan) for optical measurements. Materials included platinum crucibles, stainless steel molds, KBr for FTIR discs, and gold coating for SEM.
4：Experimental Procedures and Operational Workflow:
Batches were melted at 1150°C for 90 min, poured into molds, annealed at 400°C, and cooled slowly. Glass-ceramics were produced by two-step heat treatment: nucleation at 520°C for 12 hours and crystallization at 685°C for 6 hours, followed by slow cooling. Measurements were conducted as per standard protocols for each technique.
5：Data Analysis Methods:
IR spectra were analyzed using deconvolution, XRD patterns were used to identify crystalline phases, thermal expansion data were processed for coefficients and temperatures, and optical spectra were interpreted based on impurity content.
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