Department of Chemistry, University of Ioannina, GR-45110 Ioannina, Greece.
Department of Chemistry, University of Ioannina, GR-45110 Ioannina, Greece; Institute of Chemical Engineering Sciences, ICE-HT/FORTH, GR-26504 Patras, Greece.
Spectrochim Acta A Mol Biomol Spectrosc. 2019 Apr 5;212:363-370. doi: 10.1016/j.saa.2019.01.024. Epub 2019 Jan 15.
Vibrational and ultrasonic spectroscopies have been employed to study the composition and polarization dependence of the vibrational and elastic properties of the pseudo-binary mixed fluoride-phosphate glass-forming system xSr(PO)-(1-x)(0.62MgF-0.38AlF) with x: 0, 0.04, 0.06, 0.1, 0.15, 0.2, 0.3, 0.4, 0.8, 0.9 and 1. Composition-induced alterations in the short-range order have been quantitatively followed by means of Raman and IR spectroscopies. The analysis has shown that the incorporation of the phosphate groups in the fluoride network results in a less interconnected network with suppressed rigidity. The specific amorphous materials have been used as a model system in terms of wide glass-forming ability to elucidate the effect of variation in connectivity between the fluoride and phosphate sub-networks on the Boson peak nature. Emphasis has been given in the low-frequency Raman phenomenology, which in conjunction with the elastic properties allowed us to establish a possible link between the Boson peak and the transverse phonons in these glasses.
振动和超声光谱学被用来研究组成和极化对假二元混合氟磷酸盐玻璃形成系统 xSr(PO)-(1-x)(0.62MgF-0.38AlF) 的振动和弹性性质的依赖性，其中 x: 0, 0.04, 0.06, 0.1, 0.15, 0.2, 0.3, 0.4, 0.8, 0.9 和 1。通过拉曼和红外光谱学定量研究了短程有序的组成诱导变化。分析表明，磷酸盐基团的掺入导致氟化物网络的连接程度降低，刚性受到抑制。特定的非晶材料被用作具有广泛玻璃形成能力的模型系统，以阐明氟化物和磷酸盐亚网络之间连接性变化对玻色峰性质的影响。重点放在低频 Raman 现象学上，该现象学与弹性性质相结合，使我们能够在这些玻璃中建立玻色峰与横向声子之间的可能联系。
