关键词: MgO-CeO2;陶瓷;微波介电性能

Abstract: xMgO-yCeO2[molar percentage (mol％): x:y =1 :1, 1 :2 and 2 :1] binary microwave dielectric ceramic systems were prepared by the conventional solid-state reaction process , and the phase compositions , sintering properties and microwave dielectric of the sintered samples were investigated .The X-Ray Diffraction ( XRD ) results show that the MgO-CeO2 systems within the scope of research components can not form solid solution phases , while the two-phase coexistence , CeO2 and MgO, was detected in the range of sintering temperature from 1520℃to 1680℃.Additionally , the analysis results of the Scanning Electron Microscope with Energy Dispersive Spectrometer ( SEM-EDS ) had also further confirm the validity of this phenomenon .It also means that the gibbs standard free energy of these relevant compound formations in MgO-CeO2 systems are relatively high .In addition, the microwave dilelectric properties measured by a vector network analyzer illustrate that the εr of the MgO-CeO2 , 2MgO-CeO2 and MgO-2CeO2 multiphase ceramics have only a little influence on sintering temperature , while the Q ×f ( f=6.6-7.7 GHz) values firstly increase and then decrease with an increase in sintering temperatures.Wherein, the τf values in these ceramic systems sintered at 1600 ℃ for 4 h are in the range of ( -59--62 ) ×10 -6/℃.Moreover, some important experimental bases are provided for expanding the range of composition tailoring and designing binary phase diagram for MgO-CeO2 systems.

Key words: MgO-CeO2;ceramic;microwave dilelectric property