Table 1 Chemical analyses (ppm) of aluminium oxide powder used Several binders have been evaluated to determine their eVect on high frequency dielectric loss. Alumina cer-Impurity Na 2 O MgO SiO 2 Fe 2 O 3 CaO SO 3 CuO amics have been powder pressed with diVerent binder levels, sintered, and then the dielectric loss (tan d= Abundance, 20 16 85 29 ... ... 13Q−1) has been measured at approximately 9•5 GHz.ppm T he quality factor Q was determined and significant diVerences were observed between samples made with diVerent binders. T he diVerences are caused by the turer. There have been studies to indicate the effects of, for diVerent levels of residual porosity left by the diVerent example, oxygen deficiency on the Q factor,2 and of grain binders. In addition, diVerences in levels of impurities size on Q,3,4 but none has examined the effect of the binder in the binders may also influence Q. Selected samples itself on Q. In this study, several different binders have been were measured for green body strength as a function chosen and mixed with high purity alumina. Alumina is a of binder content.BCT /392 very useful material as it can have a very low dielectric loss5,6 and hence the effect of even minor impurities is
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