By　adding　1.5　mol.%　Bi(Mn2/3Sb1/3)O-3　(BMS),　(Bi1/2K1/2)TiO3　(BKT)　ceramics　show　an　excellent　sintering　ability　in　conventional　oxide　sintering　process.　In　a　wide　temperature　range　from　1020-1050　degrees　C,　the　0.985BKT-0.015BMS　(BKMS)　ceramics　demonstrate　a　super-high　relative　density　of　98%　and　low　dielectric　loss　tan　delta　of　0.017.　Even　though　the　temperature　reaches　to　1060　degrees　C,　BKMS　ceramics　maintain　high　relative　density　over　95%　other　than　being　collapsed　as　the　pure　BKT　did.　Besides,　the　BKMS　ceramics　sintered　at　1020　to　1050　degrees　C　present　adequately　high　electrical　properties.　The　enhanced　sintering　ability　of　BKMS　ceramics　is　attributed　to　the　increased　viscosity　of　liquid　induced　by　Sb5+　solving　in　the　liquid　phase　during　sintering.　The　work　provides　a　way　to　realize　the　densification　of　BKT　ceramics.　(C)　2019　The　Ceramic　Society　of　Japan.　All　rights　reserved.