材料科学
玻璃化转变
电子顺磁共振
无定形固体
拉曼光谱
锰
分析化学(期刊)
三元运算
红外光谱学
结晶学
化学
核磁共振
冶金
聚合物
复合材料
光学
程序设计语言
物理
有机化学
色谱法
计算机科学
作者
Asmaa Akhrouf,Saïda Krimi,M. Haddad
标识
DOI:10.1016/j.jnoncrysol.2023.122803
摘要
This paper investigates the effect of CaO substitution for MnO on the physicochemical properties in 25Na2O-(30-x)CaO-xMnO-45P2O5 (0 ≤ x ≤ 30 mol%) glass system. These materials were elaborated by the conventional melt-quenching technique at 1050 °C. Free-manganese glass is colorless, while the glasses containing manganese are purple. X-ray diffraction (XRD) confirmed the amorphous state of the studied glasses and showed that the annealing of these glasses leads to a mixture of crystalline phases. Replacing Ca-O bonds with more covalent Mn-O ones in the vitreous matrix increased density (ρ) and glass transition temperature (Tg), indicating the strength of the glass network. Infrared and Raman spectroscopies revealed the existence of PO3, PO2 and PO4 units with P-O-P linkages in the glassy network. EPR spectra exhibited absorptions centered at g ≈ 2, characteristic of isolated Mn2+ ions in distorted octahedral coordination and the optical absorption spectra disclosed bands due to Mn2+ and Mn3+ ions. Decreasing the band gap energy values (Eg) with increasing MnO content agrees with strengthening the vitreous network. Chemical durability results showed the existence of ionic exchanges between distilled water and the studied glasses, and good water resistance is detected for glasses with low Mn content (x = 5 and 10 mol%).
科研通智能强力驱动
Strongly Powered by AbleSci AI