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Phase Structure, Bond Features, and Microwave Dielectric Characteristics of Ruddlesden–Popper Type Sr2TiO4 Ceramics,Materials
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This work studied the phase constitution, bond characteristics, and microwave dielectric performances of Sr2TiO4 ceramics. Based on XRD and Rietveld refinement analysis, pure tetragonal Ruddlesden–Popper type Sr2TiO4 ceramic is synthesized at 1425~1525 °C. Meanwhile, the microstructure is dense and without porosity, indicating its high sinterability and densification. Great microwave dielectric performances can be obtained, namely an εr value of 39.41, and a Q × f value of 93,120 GHz, when sintered at 1475 °C. Under ideal sintering conditions, the extrinsic factors are minimized and can be ignored. Thus, the intrinsic factors are considered crucial in determining microwave dielectric performances. Based on the P–V–L complex chemical bond theory calculation, the largest bond ionicity, and proportions to the bond susceptibility from Sr–O bonds suggest that Sr–O bonds mainly determine the dielectric polarizability. However, the Ti–O bonds show lattice energy about three times larger than Sr–O bonds, emphasizing that the structural stability of Sr2TiO4 ceramics is dominated by Ti–O bonds, and the Ti–O bonds are vital in determining the intrinsic dielectric loss. The thermal expansion coefficient value of the Sr2TiO4 structure is also mainly decided by Ti–O bonds.
中文翻译：
本工作研究了 Sr2TiO4 陶瓷的相组成、结合特性和微波介电性能。基于 XRD 和 Rietveld 细化分析，在 1425~1525 °C 下合成了纯四方 Ruddlesden-Popper 型 Sr2TiO4 陶瓷。同时，微观结构致密且无孔隙，表明其具有较高的烧结性和致密性。在1475℃下烧结时，可获得良好的微波介电性能，即εr值为39.41，Q×f值为93,120GHz。在理想的烧结条件下，外部因素最小化并且可以忽略不计。因此，内在因素被认为对于决定微波介电性能至关重要。根据P-V-L复合化学键理论计算，最大键离子性以及Sr-O键与键磁化率的比例表明Sr-O键主要决定介电极化率。然而，Ti-O 键的晶格能大约是 Sr-O 键的三倍，这强调了 Sr2TiO4 陶瓷的结构稳定性主要由 Ti-O 键决定，而 Ti-O 键对于确定本征介电损耗至关重要。 。Sr2TiO4结构的热膨胀系数值也主要由Ti-O键决定。 |
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