Perovskite solid solutions (1 - x)Pb(Mg1/3Nb2/3)O-3.xPbTiO(3) with x between 0.06 and 0.14 were prepared by heat treatment followed by acid treatment of mixtures containing both PbO and MgO in amounts greater than in the perovskite composition. For example, heat treatment of 4PbO + 1.5MgO + 0.9Nb(2)O(5) + 0.3TiO(2) mixture at 900 degrees C for 1 h produced the perovskite with x = 0.1 without the formation of pyrochlore phase. The Pb(Mg1/3Nb2/3)O-3-PbTiO3 (PMN-PT) solid solutions were crystallized into discrete cubes several micrometers in size. After sintering these particles at 1290 degrees C for 2 h in a PbO atmosphere, the relative density of the ceramics was 93% or more. The ceramics with x = 0.08-0.1 showed a large electric field-induced strain near room temperature.