TY - JOUR
T1 - Low-loss microwave dielectrics of Li2(1–x)MxWO4 (M= Mg, Zn; x= 0.01–0.09) for ULTCC applications
AU - Hsu, Tsung Hsien
AU - Huang, Cheng Liang
N1 - Funding Information:
The work was financially sponsored by the National Science and Technology Council of Taiwan under the projects MOST 110-2221-E-006-032-MY2 and MOST 111-2221-E-006-164-MY2 . The authors would like to thank Ms. Hui–Jung Shih, The Instrument Center of National Cheng Kung University for supporting the use of high-resolution SEM ( Hitachi SU8000 ). The authors also gratefully acknowledge the use of D8 Discover equipment belonging to the Instrument Center of National Cheng Kung University .
Funding Information:
The work was financially sponsored by the National Science and Technology Council of Taiwan under the projects MOST 110-2221-E-006-032-MY2 and MOST 111-2221-E-006-164-MY2. The authors would like to thank Ms. Hui–Jung Shih, The Instrument Center of National Cheng Kung University for supporting the use of high-resolution SEM (Hitachi SU8000). The authors also gratefully acknowledge the use of D8 Discover equipment belonging to the Instrument Center of National Cheng Kung University.
Publisher Copyright:
© 2023 Elsevier Ltd
PY - 2023/5
Y1 - 2023/5
N2 - Li2(1–x)MxWO4 (M = Mg, Zn; x = 0.01–0.09) ceramics with an ultra-low sintering temperature of 540 °C were prepared by solid-state synthesis and their structural characteristics and microwave dielectric properties were systematically investigated. By replacing Li with 0.05 mol% Mg or 0.07 mol% Zn, the sintering temperature of the Li2WO4 dielectric could be brought down from 660 to 540 °C along with the combined dielectric properties of the εr of 6.2 and 5.8, a Q × f of 76,000 and 68,000 GHz, and the τf of −94 and −86 ppm/°C, respectively. The corrected dielectric constant was found to be proportional to the ratio of αD(dielectric polarizability)/Vm(molecular volume). The results showed that the Q × f values could be dramatically improved by increasing the density, packing fraction and lattice energy. Moreover, the τf values of ceramics render a similar variation tendency by shifting linearly toward zero as the Vcation increases. The Li2(1–x)MxWO4 ceramic is a glass-free, phase pure, and energy-saving dielectric ideal for ULTCC applications.
AB - Li2(1–x)MxWO4 (M = Mg, Zn; x = 0.01–0.09) ceramics with an ultra-low sintering temperature of 540 °C were prepared by solid-state synthesis and their structural characteristics and microwave dielectric properties were systematically investigated. By replacing Li with 0.05 mol% Mg or 0.07 mol% Zn, the sintering temperature of the Li2WO4 dielectric could be brought down from 660 to 540 °C along with the combined dielectric properties of the εr of 6.2 and 5.8, a Q × f of 76,000 and 68,000 GHz, and the τf of −94 and −86 ppm/°C, respectively. The corrected dielectric constant was found to be proportional to the ratio of αD(dielectric polarizability)/Vm(molecular volume). The results showed that the Q × f values could be dramatically improved by increasing the density, packing fraction and lattice energy. Moreover, the τf values of ceramics render a similar variation tendency by shifting linearly toward zero as the Vcation increases. The Li2(1–x)MxWO4 ceramic is a glass-free, phase pure, and energy-saving dielectric ideal for ULTCC applications.
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U2 - 10.1016/j.mssp.2023.107355
DO - 10.1016/j.mssp.2023.107355
M3 - Article
AN - SCOPUS:85147255342
SN - 1369-8001
VL - 158
JO - Materials Science in Semiconductor Processing
JF - Materials Science in Semiconductor Processing
M1 - 107355
ER -