Low　temperature　sintering　of　0.5　wt.%　MnO2-added　Pb((Zn1/3Nb2/3)(0.20)　(Zr0.50Ti0.50)(0.80))O-3　ceramics　(PZNT)　was　investigated　using　CuO　as　sintering　aids.　It　was　found　that　the　addition　of　CuO　significantly　improved　the　sinterability　of　PZNT　ceramics,　resulting　in　a　reduction　of　sintering　temperature　from　1050　to　900　degreesC.　The　CuO　addition　also　influences　in　a　pronounced　way　both　the　crystal　structure　and　microstructure　of　the　low　temperature　sintered　PZNT　materials.　The　materials　are　transformed　from　the　tetragonal　to　the　rhombohedral　structure,　and　the　grain　sizes　are　decreased　when　CuO　are　added.　The　distortion　of　crystal　structure　for　PZNT　samples　with　CuO　addition　can　be　explained　with　Jahn-Teller　effect　for　electron　state　d(9)　Of　Cu2+　ion.　On　the　other　hand,　with　the　increasing　of　CuO　addition,　k(p),　d(33)　were　slightly　decreased,　but　Q(m)　and　tan　delta　were　optimized　at　1.5　wt.%　CuO.　(C)　2004　Elsevier　B.V.　All　rights　reserved.