Effects of CaO-B2O3 glass addition on the low-temperature sintering and cation ordering in SrxLa(1-x)TixAl(1-x)O3 ceramics

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作者：
Lei, Shenhui [1 ]
Fan, Huiqing [1 ]
Chen, Weina [1 ]
机构：
[1] State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an,710072, China
来源：
Journal of Alloys and Compounds | 2015年 / 632卷
关键词：
SrxLa(1-x)TixAl(1-x)O3 (SLTA, x = 0.4-0.7) ceramics with additive of CaO-B2O3 glass (1-10 wt%) were prepared by a solid-state reaction process, which led to a significant decrease in sintering temperature, from 1550 °C to 1100 °C. Dielectric properties of ceramics at low frequency were significantly improved by CaO-B2O3 glass addition, especially the obtained dielectric loss ∼6 × 10-4 at room temperature and 1 MHz. Superlattice reflection was detected in the prepared oxides by X-ray diffraction (XRD), selected area electron diffraction (SAED) and Raman spectra, indicating presence of cation ordering. Meanwhile, lattice images of high-resolution transmission electron microscopy (HRTEM) also certificated the presence of cations ordering. Notably, the detected superlattice reflection in perovskite structure associated with antiparallel A-site cation displacements and anti-phase octahedral tilting. This ordered structure as well as low temperature sintering both affected the microwave dielectric properties of Sr0.7La0.3Ti0.7Al0.3O3 ceramics, which exhibited with Εr ∼ 43.3, Q × f ∼ 10,780 GHz and τf ∼ 20.8 ppm/°C. The smaller cations doped in A site, a larger difference in ionic radius or cation valence of B-site cations were considered to primarily facilitate the formation of cation ordering, which promoted microwave dielectric properties of the ceramics. © 2015 Elsevier B.V. All rights reserved;
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