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Structural, optical, and dielectric properties of the BaO–TiO 2 –P 2 O 5 glasses
Journal of the Australian Ceramic Society ( IF 1.8 ) Pub Date : 2020-06-26 , DOI: 10.1007/s41779-020-00473-1
E. Haily , L. Bih , A. El Bouari , A. Lahmar , M. El Marssi , B. Manoun

The glass compositions 20BaO–xTiO2–(80–x)P2O5 with (x = 5, 10, and 20%mol) were elaborated by the conventional quenching method. These vitreous materials show a constant content of the barium oxide while the Ti/P ratio varies. They are characterized by X-ray diffraction in order to ascertain their amorphous nature. Density measurements are performed using diethyl orthophthalate as a medium liquid. It was found that their density and molar volume increases and reduces with TiO2 content, respectively. Raman spectroscopic analysis is employed to characterize their structural approach. This technique revealed the occurrence of various structural units of phosphate in the glass-matrix, primarily pyrophosphates, and metaphosphates. The optical absorption study of glasses confirmed the existence of Ti3+ ions in all the glassy samples, and it was found that the optical bandgap depends on the composition of the glass and reduces as the TiO2 content increases. Glass-ceramics relatives to the glasses were obtained by performing heat treatments of the glasses. The crystallized phases are identified using X-ray diffraction (XRD). It was found that a glass-ceramic containing a ferroelectric BaTiO3 phase is developed by transforming a glass composition (x = 20) to a crystalline phase. The electrical properties of the glass-ceramics are performed by impedance spectroscopy in the frequency range of 100 Hz to 1 MHz under various temperatures from 300 to 573 K. The glass-ceramic (GC) (x = 20) at room temperature has the highest dielectric constant εr = 51.6 and lower dielectric loss Tanδ = 0.005, and it was found that the glass-ceramics are mixed conductors with both ionic and electronic conductivities. The obtained results are discussed according to the chemical composition of these materials.



中文翻译:

BaO-TiO 2 -P 2 O 5玻璃的结构,光学和介电性能

 用常规的淬火方法制备了玻璃成分20BaO– x TiO 2 –(80– x)P 2 O 5x = 5、10和20%mol)。这些玻璃态材料显示出恒定的氧化钡含量,而Ti / P比却变化。它们通过X射线衍射来表征,以确定其无定形性质。使用邻苯二甲酸二乙酯作为介质液体进行密度测量。发现它们的密度和摩尔体积随着TiO 2的增加和减少内容。拉曼光谱分析用于表征其结构方法。该技术揭示了玻璃基质中磷酸盐的各种结构单元的出现,主要是焦磷酸盐和偏磷酸盐。玻璃的光吸收研究证实了所有玻璃样中都存在Ti 3+离子,并且发现带隙取决于玻璃的组成,并且随着TiO 2含量的增加而减小。通过对玻璃进行热处理而获得与玻璃的玻璃陶瓷亲戚。使用X射线衍射(XRD)识别结晶相。发现含有铁电性BaTiO 3的玻璃陶瓷通过将玻璃组合物(x  = 20)转变为结晶相,可形成有机相。在300至573 K的各种温度下,通过阻抗谱在100 Hz至1 MHz的频率范围内执行玻璃陶瓷的电性能。室温下的玻璃陶瓷(GC)(x  = 20)最高介电常数εr  = 51.6和较低的介电损耗Tanδ= 0.005,并且发现玻璃陶瓷是具有离子和电子电导率的混合导体。根据这些材料的化学组成讨论了获得的结果。

更新日期:2020-06-26
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