受限条件下玻璃基质中LaF3微晶生长机理的光谱学探究简

利用高温熔融法制备了Eu³⁺掺杂的45SiO₂-25Al₂O₃-18Na₂O-9.5LaF₃玻璃，并将基础玻璃在可控条件下进行晶化热处理后获得了性能良好的玻璃陶瓷. 通过XRD，TEM和光谱学手段对玻璃陶瓷进行了表征，结果表明晶化热处理后，LaF₃纳米晶体从原有单一的玻璃相中析出，晶粒大小约为25 nm. Eu³⁺掺杂玻璃陶瓷、纳米晶体和玻璃3种基质的光谱分析及XRD结果证明稀土离子进入到LaF₃纳米晶体中并计算出在其中富集的比例. 进一步利用源自于Eu³⁺离子的发射谱和激发谱研究了退火温度和前驱物中重金属离子对玻璃网络结构中LaF₃纳米晶体生长影响的机理，为玻璃陶瓷的人工设计合成提供了理论支持.

Spectroscopic exploration of growth mechanism of LaF3 nanocrystals embedded in glass ceramics under restricted conditions

Eu³⁺ doped 45SiO₂-25Al₂O₃-18Na₂O-9.5LaF₃-2.5EuF₃ glass was successfully prepared via solid-state reaction, and the corresponding glass ceramics showing an excellent optical property was also synthesized by annealing the prepared glass at 700℃. The glass ceramics was characterized by XRD, TEM and spectroscopic routes. The results indicated that LaF₃ nanocrystals with size about 25 nm were embedded uniformly into the annealed glass. The Eu³⁺ ions in glass phase and crystal phase local environment are excited selectively using the spectroscopic strategy. The difference of emission spectra of Eu³⁺ in the glass ceramics, nanocrystals and glass matrices was compared in detail. We made up the characteristic spectrum of Eu³⁺ in glass ceramics using the spectra of Eu³⁺ in nanocrystals and glass matrices and subsequently inferred the radio of rare-earth ions located in two kinds of local ambiences including glass phase and crystal phase ambience. The effects of annealing temperatures and heavy metallic ions in starting materials on the growth of LaF₃ nanocrystals are explored as well.