Abstract
Novel NaAGeO4 (A = Sm, Y) ceramics with olivine structures were prepared and characterized. The phase composition, microstructural evolution, and densification behavior of the ceramics were investigated. The NaAGeO4 (A = Sm, Y) ceramics possessed a single orthorhombic crystal system with Pbn21 and Pnma space groups. The NaSmGeO4 ceramics had dense grains, clear boundaries, and low sintering temperatures, whereas a relatively wide range of sintering temperatures were feasible for the NaYGeO4 ceramics. The NaSmGeO4 ceramic material sintered at 1025 °C possessed excellent performance-related parameters, i.e., Q × f = 31,281 GHz, εr = 6.29, and τƒ = −48.3 ppm/°C, whereas those for the NaYGeO4 ceramic material were Q × f = 32,646 GHz, εr = 6.74, and τƒ = −39 ppm/°C at 1200 °C. Furthermore, doping the NaYGeO4 ceramic material with CaTiO3 to obtain 0.12CaTiO3-0.88NaYGeO4 yielded a τƒ value close to zero (−3 ppm/°C). The results demonstrate that NaAGeO4 (A = Sm, Y) ceramics have substantial potential for application in microwave devices.
Published Version
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