TY - JOUR
T1 - Effects of CaO-B2O3 glass addition on the low-temperature sintering and cation ordering in SrxLa(1-x)TixAl(1-x)O3 ceramics
AU - Lei, Shenhui
AU - Fan, Huiqing
AU - Chen, Weina
N1 - Publisher Copyright:
© 2015 Elsevier B.V. All rights reserved.
PY - 2015/5/25
Y1 - 2015/5/25
N2 - 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.
AB - 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.
KW - CaO-BO glass
KW - Low-firing
KW - Microwave dielectric properties
KW - SLTA ceramics
UR - http://www.scopus.com/inward/record.url?scp=84922367102&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2015.01.142
DO - 10.1016/j.jallcom.2015.01.142
M3 - 文章
AN - SCOPUS:84922367102
SN - 0925-8388
VL - 632
SP - 78
EP - 86
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
ER -