Reaction sintering and mechanism of microwave dielectric ceramic with K2NiF4 structure and perovskite structure

作者：Wang, Xi; Liu, KaiYang; Zhou, Shicheng; He, Sen; Deng, Shan; Xiao, YaQi; Chen, XiuLi; Zhou, Huanfu^*

来源：Journal of Materials Science: Materials in Electronics , 2022, 33(4): 2213-2221.

DOI：10.1007/s10854-021-07429-6

• CRYSTAL-STRUCTURE
• PHASE-STRUCTURE
• BEHAVIOR
• COMPOSITE

We use reaction sintering method (RS) to prepared 0.85(1 - xCaTiO(3-)xLnAlO(3))-0.15Ca(1.15)Ln(0.85)Al(0.85)Ti(0.15)O(4) (Ln = Nd, Y) ceramics. CLnC ceramics have two phase structures of perovskite and K2NiF4. The ceramic grains are obvious solid solutions, and gradually enlarge with increasing the sintering temperature. CNdC ceramics exhibit good microwave dielectric properties in the sintering temperature range of 1475-1575 degrees C. As the sintering temperature increases from 1475 to 1500 degrees C, the density of CNdC ceramics tends to be stable, fluctuates around 4.6 g/cm(3). The epsilon(r) reaches maximum value at 1500 degrees C then gradually decreases. As the sintering temperature increases from 1500 to 1550 degrees C, the Q x f keeps a stable value from 41,953 to 44,188 GHz. As the sintering temperature was 1500 degrees C, the CNdC ceramics achieved the best microwave dielectric properties with epsilon(r) = 37.15, Q x f = 44,188 GHz, tau(f) = - 4 ppm/degrees C. The sintering temperature of CYC ceramics was relatively low and the ceramics sintered at 1450 degrees C achieved good microwave dielectric properties of epsilon(r) = 38.3, Q x f = 29,620 GHz, tau(f) = 0.03 ppm/excellent. It is worth noting that CYC ceramics have an excellent tau(f), which can ensure excellent temperature stability during application.

• 单位
  桂林理工大学