研究目的
Investigating the systematic development of microstructural and thermal diffusivity behaviour of strontium titanate from nanometric to micronic grains.
研究成果
The study successfully demonstrated the dependency of thermal diffusivity on microstructural properties, influenced by phonon-scattering mechanisms. Three distinct groups of thermal diffusivity values were identified, correlating with grain size and microstructural evolution. The findings provide insights into tailoring strontium titanate's thermal properties for specific applications.
研究不足
The study focuses on the thermal diffusivity and microstructural development of strontium titanate under specific heat treatments. The influence of other factors such as doping or different sintering atmospheres was not explored.
1：Experimental Design and Method Selection
Two different heat treatments (with presintering and without presintering) were applied to strontium titanate samples. The samples were sintered from 500 to 1400 °C in 100 °C increments.
2：Sample Selection and Data Sources
Strontium carbonate and titanium (iv) oxide with 99.9% purity were used as starting materials. Samples were prepared with and without presintering treatment.
3：List of Experimental Equipment and Materials
High-energy ball-milling machine (SPEX8000D mechanical alloying machine), tungsten carbide vials (55 mL), polyvinyl alcohol as a binder, zinc stearate as a lubricant, X-ray diffractometer (Philips X’PERT), FESEM Nova NanoSEM 50 series for micrographs, Laser Flash Apparatus (LFA) Neszch LFA457 for thermal diffusivity measurements.
4：Experimental Procedures and Operational Workflow
Milling process for 12 h, monodispersion technique with polyvinyl alcohol, sieving with 150 microns sieve, pressing at 3 tons to obtain pellets, sintering in ambient air condition with a heating rate of 4 °C min-1.
5：Data Analysis Methods
XRD for phase confirmation, FESEM for microstructural analysis, Image J software for grain-size distribution analysis, Archimedes’ principle for density determination, LFA for thermal diffusivity measurements.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
