Chiang Mai Journal of Science

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PMN ceramics were prepared using calcined powders of various particle size produced from  the  columbite  method.  MgO  and  (MgCO₃)₄Mg(OH)₂×5(H₂O)  were  initially  used  to produce columbite powder before calcining with PbO and sintered to produce PMN1 and PMN2 ceramics respectively. The results show that properties of  ceramics are strongly influenced by the particle size of  the calcined powders. Particle size affected not only the resultant grain size  but  also  the  formation  of   perovskite  phase  (such  in  the  case  of  PMN1  ceramics), consequently  affecting  the  dielectric  constant  of  PMN1  ceramics.  In  PMN2  ceramics,  no pyrochlore  were  detected  and  ceramics  prepared  from  powders  with  largest  particle  size were consequently found to have largest grain size which in turn led to higher dielectric constant.

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