Effect of Particle Size of Starting Powders on the Properties of Pb(Mg1/3Nb2/3)O3 Ceramics
Arnon Chaipanich* and T awee T unk asiri* Author for corresponding; e-mail address: arnon@chiangmai.ac.th
Volume: Vol.32 No.3 (SEPTEMBER 2005)
Research Article
DOI:
Received: -, Revised: -, Accepted: -, Published: -
Citation: Chaipanich A. and Asiri T.A.T.U., Effect of Particle Size of Starting Powders on the Properties of Pb(Mg1/3Nb2/3)O3 Ceramics, Chiang Mai Journal of Science, 2005; 32(3): 315-321.
Abstract
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.