Structure-Dependent Microwave Dielectric Properties and MiddleTemperature Sintering of Forsterite (Mg1-xNix)(2)SiO4 Ceramics

作者：Zhang, Chen; Zuo, Ruzhong^*; Zhang, Jian; Wang, Yang

来源：Journal of the American Ceramic Society, 2015, 98(3): 702-710.

DOI：10.1111/jace.13347

• Microwave dielectric properties
• Middle temperatures
• Orthorhombic structures
• Secondary phase
• Sintering Aid
• Sintering behaviors
• Sintering temperatures
• Structure dependent

The crystal structure, microstructure, and microwave dielectric properties of forsterite-based (Mg1-xNix)(2)SiO4 (x=0.02-0.20) ceramics were systematically investigated. All samples present a single forsterite phase of an orthorhombic structure with a space group Pbnm except for a little MgSiO3 secondary phase as x>0.08. Lattice parameters in all axes decrease linearly with increasing Ni content due to the smaller ionic radius of Ni2+ compared to Mg2+. The substitution of an appropriate amount of Ni2+ could greatly improve the sintering behavior and produce a uniform and closely packed microstructure of the Mg2SiO4 ceramics such that a superior Qxf value (152300GHz) can be achieved as x=0.05. The (f) value was found to increase with increasing A-site ionic bond valences. In addition, various additives were used as sintering aids to lower the sintering temperature from 1500 degrees C to the middle sintering temperature range. Excellent microwave dielectric properties of epsilon(r)similar to 6.9, Qxf similar to 99800GHz and (f)similar to-50ppm/degrees C can be obtained for 12wt% Li2CO3-V2O5-doped (Mg0.95Ni0.05)(2)SiO4 ceramics sintered at 1150 degrees C for 4h.

• 出版日期2015-3
• 单位合肥工业大学