(1　-　x)(K0.5Na0.5)NbO3-xLiNbO(3)　((1　-　x)KNN-xLN)　nanoparticles　with　the　mean　particle　size　about　20-30　nm　have　been　prepared　by　an　economical　sol-gel　routes　using　Nb2O5　as　Nb　source.　Due　to　the　high　sintering　ability　of　nano-particles,　fine-grained　KNN-LN　lead-free　ceramics　have　been　densified　at　the　temperature　below　1000　degrees　C.　X-ray　diffraction　analysis　indicated　that　the　phase　structure　of　the　ceramics　changed　from　orthorhombic　to　tetragonal　at　x　=　0.08-0.10.　When　the　x　reached　0.10　and　above,　the　perovskite　structure　could　not　be　maintained　and　the　impurity　phases　of　K3Li2Nb5O15　and　LiNbO3　appeared,　indicating　that　x　=　0.10　is　near　the　solubility　limit.　Optimized　parameters,　such　as　d(33)　=　170　pC/N　and　k(p)　=　0.40,　were　achieved　in　0.90KNN-0.10LN　systems.　Due　to　the　merits　of　fine-grained　structure　and　low　sintering　temperatures,　it　will　be　helpful　to　the　application　of　KNN-LN　materials　for　lead-free　multilayer　piezoelectric　actuator.　(C)　2012　Elsevier　B.V.　All　rights　reserved.