TY - JOUR
T1 - Processing strategy and composite regulation on dielectric performance in Li2O–Al2O3–B2O3 dielectric systems using SrTiO3
AU - Xiong, Siyu
AU - Chen, Deqin
AU - Zhu, Xiaowei
AU - Zhu, Guobin
AU - Xiao, Hongxiang
AU - Gong, Weiping
AU - Liu, Laijun
AU - Khaliq, Jibran
AU - Li, Chunchun
PY - 2024/9/1
Y1 - 2024/9/1
N2 - In this paper, we investigated the effect of processing parameters and composite regulation on the structure and property relationship of lightweight low-permittivity Li2O–Al2O3–B2O3 dielectric system. Li2BAlO4 ceramic and (1 − x)Li2BAlO4–xSrTiO3 ceramics were synthesized using a conventional solid-state reaction method. Thermodynamic analysis, sintering temperature, phase formation, crystal structure, and microwave dielectric properties were investigated. Thermal analysis revealed a melting temperature of 847°C, suggesting a comparatively low temperature for the sintering of Li2BAlO4 ceramics. Li2BAlO4 crystalized into a monoclinic structure with P21/c space group, with [Al2B2O8] rings connected by [BO3] triangles and [AlO4] tetrahedra through Al–O–Al bridges. Dense Li2BAlO4 ceramics with a relative density of ∼97.7% were sintered at 750°C and had optimal microwave dielectric properties with relative permittivity (εr) of 5.13, quality factor (Q × f) of 22 610 GHz, and the temperature coefficient of resonance frequency (τf) of −112.5 ppm/°C. The 0.88Li2BAlO4–0.12SrTiO3 composite ceramic has excellent microwave dielectric properties with εr = 8.83, Q × f = 14 000 GHz, τf = 4.6 ppm/°C. The ceramics also demonstrated an inert behavior with silver electrodes proving its application in low-temperature cofired ceramic (LTCC) technology.
AB - In this paper, we investigated the effect of processing parameters and composite regulation on the structure and property relationship of lightweight low-permittivity Li2O–Al2O3–B2O3 dielectric system. Li2BAlO4 ceramic and (1 − x)Li2BAlO4–xSrTiO3 ceramics were synthesized using a conventional solid-state reaction method. Thermodynamic analysis, sintering temperature, phase formation, crystal structure, and microwave dielectric properties were investigated. Thermal analysis revealed a melting temperature of 847°C, suggesting a comparatively low temperature for the sintering of Li2BAlO4 ceramics. Li2BAlO4 crystalized into a monoclinic structure with P21/c space group, with [Al2B2O8] rings connected by [BO3] triangles and [AlO4] tetrahedra through Al–O–Al bridges. Dense Li2BAlO4 ceramics with a relative density of ∼97.7% were sintered at 750°C and had optimal microwave dielectric properties with relative permittivity (εr) of 5.13, quality factor (Q × f) of 22 610 GHz, and the temperature coefficient of resonance frequency (τf) of −112.5 ppm/°C. The 0.88Li2BAlO4–0.12SrTiO3 composite ceramic has excellent microwave dielectric properties with εr = 8.83, Q × f = 14 000 GHz, τf = 4.6 ppm/°C. The ceramics also demonstrated an inert behavior with silver electrodes proving its application in low-temperature cofired ceramic (LTCC) technology.
KW - composite regulation
KW - LiO–BO–AlO
KW - lightweight
KW - low permittivity
KW - low-temperature cofired ceramic (LTCC) technology
KW - microwave dielectric ceramic
UR - http://www.scopus.com/inward/record.url?scp=85192185730&partnerID=8YFLogxK
U2 - 10.1111/jace.19858
DO - 10.1111/jace.19858
M3 - Article
AN - SCOPUS:85192185730
SN - 0002-7820
VL - 107
SP - 6080
EP - 6090
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
IS - 9
ER -