Structural Role of CeO<sub>2</sub>in the Modified Borate Glass-Ceramics

• 作者: Nada ElBaz Gomaa El-Damrawi Amr M. Abdelghany
• 来源期刊: 玻璃与陶瓷期刊(英文)
• 学科: 工学
• 关键词: Cerium Borate Glass Morphology Crystalline State Spheroid Species
• 年，卷（期）: 2021,（1）
• 页码范围: 34-43
• 页数: 10页
• 分类号: TG1

摘要

A new type of cerium borate glass-ceramic is prepared and studied. The microstructure and crystallization behaviors of the glass samples were investigated by X-ray diffraction (XRD), electron diffraction (ED), and ^{<span style="font-size:12px;font-family:Verdana;">31</span>}<span style="font-family:Verdana;">P NMR spectroscopy. The microstructures of samples contain <1 mol% CeO</span>_{<span style="font-size:12px;font-family:Verdana;">2</span>}<span style="font-family:Verdana;"> </span><span style="font-family:;" "=""><span style="font-family:Verdana;">are amorphous in nature. More addition of CeO</span>_{<span style="font-size:12px;font-family:Verdana;">2</span>}<span style="font-family:Verdana;"> transforms the glass to glass-ceramics without thermal annealing. The morphological change of the microstructure of these materials was followed by transmission electron microscopy (TEM). The obtained results have revealed that the addition of more than 0.8 mol% CeO</span>_{<span style="font-size:12px;font-family:Verdana;">2</span>}<span style="font-family:Verdana;"> can promote nucleation and crystallization routes that </span></span><span style="font-family:Verdana;">are </span><span style="font-family:;" "=""><span style="font-family:Verdana;">combined with the establishment of diverse crystalline phases. Glasses with lower contents of CeO</span>_{<span style="font-size:12px;font-family:Verdana;">2</span>}<span style="font-family:Verdana;">showed no tendency to crystallization. The crystals of CeO</span>_{<span style="font-size:12px;font-family:Verdana;">2</span>}<span style="font-family:Verdana;"> containing glasses were spheroid like morphology that </span></span><span style="font-family:Verdana;">was </span><span style="font-family:Verdana;">assigned to the three-dimensional fast growth of the well-formed structural species in the boro-apatite phase. In addition, the cerium free glass is characterized by particle-like morphology. Then the growth of spheroid species