TY - JOUR
T1 - Enhanced high temperature dielectric polarization of barium titanate/magnesium aluminum spinel composites and their potential in microwave absorption
AU - Jia, Hongyao
AU - Zhou, Wancheng
AU - Nan, Hanyi
AU - Dong, Jie
AU - Qing, Yuchang
AU - Luo, Fa
AU - Zhu, Dongmei
N1 - Publisher Copyright:
© 2019 Elsevier Ltd
PY - 2020/3
Y1 - 2020/3
N2 - Antioxidant materials with high permittivity are highly desirable for thin, microwave-absorbing materials at high temperature (MAMHT) due to their great impedance matching. In this work, composite ceramics composed of BaTiO3 and MgAl2O4 (BTMAS) synthesized by a traditional solid-state sintering method have been studied for their high temperature microwave dielectric properties. When the temperature rose between 473 K–573 K, the real part of permittivity (ε’) of BTMAS increased significantly relative to room temperature. As the temperature increased further to 873 K, ε’ gradually fell. Based on the collection of permittivities obtained by the inverse resolution of specific reflectivity, BT36 (36 mol % BaTiO3) was suitable for 1.1 mm thick microwave-absorbing materials from 300 K – 873 K. The envisaged material had an absorption bandwidth of 2 GHz (RL<-5 dB) which could move between microwave X-band as the temperature changed. Therefore, there is great potential for BTMAS in reducing the thickness of MAMHT.
AB - Antioxidant materials with high permittivity are highly desirable for thin, microwave-absorbing materials at high temperature (MAMHT) due to their great impedance matching. In this work, composite ceramics composed of BaTiO3 and MgAl2O4 (BTMAS) synthesized by a traditional solid-state sintering method have been studied for their high temperature microwave dielectric properties. When the temperature rose between 473 K–573 K, the real part of permittivity (ε’) of BTMAS increased significantly relative to room temperature. As the temperature increased further to 873 K, ε’ gradually fell. Based on the collection of permittivities obtained by the inverse resolution of specific reflectivity, BT36 (36 mol % BaTiO3) was suitable for 1.1 mm thick microwave-absorbing materials from 300 K – 873 K. The envisaged material had an absorption bandwidth of 2 GHz (RL<-5 dB) which could move between microwave X-band as the temperature changed. Therefore, there is great potential for BTMAS in reducing the thickness of MAMHT.
KW - Dielectric polarization
KW - High temperature permittivity
KW - Microwave absorbing
KW - Oxide composite ceramics
UR - http://www.scopus.com/inward/record.url?scp=85075359504&partnerID=8YFLogxK
U2 - 10.1016/j.jeurceramsoc.2019.11.003
DO - 10.1016/j.jeurceramsoc.2019.11.003
M3 - 文章
AN - SCOPUS:85075359504
SN - 0955-2219
VL - 40
SP - 728
EP - 734
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
IS - 3
ER -