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

Shenhui Lei, Huiqing Fan, Weina Chen

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24 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)78-86
Number of pages9
JournalJournal of Alloys and Compounds
Volume632
DOIs
StatePublished - 25 May 2015

Keywords

  • CaO-BO glass
  • Low-firing
  • Microwave dielectric properties
  • SLTA ceramics

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