TY - JOUR
T1 - Effect of aluminum doping on microwave absorption properties of ZnO / ZrSiO 4 composite ceramics
AU - Kong, Luo
AU - Yin, Xiaowei
AU - Zhang, Litong
AU - Cheng, Laifei
PY - 2012/10
Y1 - 2012/10
N2 - In this study, Al-doped ZnO particles are infiltrated into porous ZrSiO 4 substrates to form an Al-doped ZnO/ZrSiO 4 composite ceramic using sol-gel process. The doping of aluminum results in the high-concentration carriers, leading to the improvement of polarization capability and electric conductivity. When the Al content increases to 2.5 at.%, particle shape is changed from spherical into flower-like one, and the electric conductivity of ZnO/ZrSiO 4 composite ceramics is further improved. Therefore, both dielectric loss and microwave absorption properties of ZnO/ZrSiO 4 composite ceramics increase with the increase of Al content. The further increase of Al content leads to the production of ZnAl 2O 4, which is a low-permittivity ceramic, so the dielectric constant and dielectric loss of ZnO/ZrSiO 4 composite ceramics show a decreasing tendency. Owing to the higher dielectric loss, the 2.5 at.% Al-doped ZnO/ZrSiO 4 composite ceramics exhibit the best microwave absorption properties over the frequencies ranging from 8.2 to 12.4 GHz (X-band).
AB - In this study, Al-doped ZnO particles are infiltrated into porous ZrSiO 4 substrates to form an Al-doped ZnO/ZrSiO 4 composite ceramic using sol-gel process. The doping of aluminum results in the high-concentration carriers, leading to the improvement of polarization capability and electric conductivity. When the Al content increases to 2.5 at.%, particle shape is changed from spherical into flower-like one, and the electric conductivity of ZnO/ZrSiO 4 composite ceramics is further improved. Therefore, both dielectric loss and microwave absorption properties of ZnO/ZrSiO 4 composite ceramics increase with the increase of Al content. The further increase of Al content leads to the production of ZnAl 2O 4, which is a low-permittivity ceramic, so the dielectric constant and dielectric loss of ZnO/ZrSiO 4 composite ceramics show a decreasing tendency. Owing to the higher dielectric loss, the 2.5 at.% Al-doped ZnO/ZrSiO 4 composite ceramics exhibit the best microwave absorption properties over the frequencies ranging from 8.2 to 12.4 GHz (X-band).
UR - http://www.scopus.com/inward/record.url?scp=84867096510&partnerID=8YFLogxK
U2 - 10.1111/j.1551-2916.2012.05278.x
DO - 10.1111/j.1551-2916.2012.05278.x
M3 - 文章
AN - SCOPUS:84867096510
SN - 0002-7820
VL - 95
SP - 3158
EP - 3165
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
IS - 10
ER -