Journal
JOURNAL OF ASIAN CERAMIC SOCIETIES
Volume 10, Issue 2, Pages 489-497Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/21870764.2022.2075619
Keywords
Aluminum nitride; thermal conductivity; dielectric properties; impedance spectroscopy; defects
Categories
Funding
- National Major Science and Technology Projects of China [2013ZX02104-001-002]
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The effect of ZnO on the phase composition, microstructure, thermal and dielectric properties of AlN ceramics was studied. Suitable addition of ZnO can effectively increase the thermal conductivity and alter the dielectric properties of AlN ceramics, while excessive addition leads to a decrease in thermal conductivity and electrical resistivity.
The effect of ZnO on phase composition, microstructure, thermal and dielectric properties of AlN ceramics was studied. The X-ray diffraction indicated that ZnAl2O4 and ZnO phases were detected in samples. With 0.5 wt% ZnO added, the thermal conductivity of AlN sample increased to 193.7 W/m.K. Whereas, the thermal conductivity dropped sharply due to excess ZnO. Moreover, the addition of ZnO increased the permittivity and altered the relaxation mechanism of AlN ceramics. The fitting data and activation energy from impedance spectroscopy revealed the variation of defect mechanisms in samples. The addition of 0.5 wt% ZnO reduced the concentration of aluminum vacancy in AlN grains to improve thermal conductivity. Nevertheless, excess ZnO dissolved into the AlN lattice and created additional defects, causing the decrease in thermal conductivity and electrical resistivity for AlN ceramics. Overall, suitable addition of ZnO can effectively increase the thermal conductivity and alter the dielectric properties of AlN ceramics.
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