Microstructural evolution, dielectric performance, and densification behavior of novel NaAGeO4 (A = Sm, Y) ceramics

作者：Zhou, Shicheng; Wang, Xi; He, Sen; Chen, Xiuli; Wu, You; Zhou, Huanfu^*

来源：Ceramics International, 2022, 48(11): 16386-16390.

DOI：10.1016/j.ceramint.2022.02.189

• Dielectric properties
• Porosity
• Sintering

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 degrees C possessed excellent performance-related parameters, i.e., Q x f = 31,281 GHz, er = 6.29, and zf = -48.3 ppm/degrees C, whereas those for the NaYGeO4 ceramic material were Q x f = 32,646 GHz, er = 6.74, and zf = -39 ppm/degrees C at 1200 degrees C. Furthermore, doping the NaYGeO4 ceramic material with CaTiO3 to obtain 0.12CaTiO3-0.88NaYGeO4 yielded a zf value close to zero (-3 ppm/degrees C). The results demonstrate that NaAGeO4 (A = Sm, Y) ceramics have substantial potential for application in microwave devices.

• 单位
  桂林理工大学