Stoichiometric lead magnesium niobate, Pb(Mg1/3Nb2/3)O-3 (PMN), perovskite ceramics produced by reaction-sintering process were investigated. Without calcination, a mixture of PbO, Nb2O5, and Mg(NO3)(2) was pressed and sintered directly. Stoichiometric PMN ceramics of 100% perovskite phase were obtained for 1, 2, and 4 h sintering at 1250 and 1270degreesC. PMN ceramics with density 8.09 g/cm(3) (99.5% of theoretical density 8.13 g/cm(3)) and K-max 19,900 under 1 kHz were obtained. (C) 2003 Elsevier Ltd. All rights reserved.