An　Aurivillius　phase　bismuth　layer-structured　compound,　Na0.5Bi2.5Nb2O9　(NBN),　has　been　prepared　by　an　economical　aqueous　sol-gel　technique.　The　results　indicated　that　pure　NBN　nano-particles　can　be　obtained　at　a　low　temperature　of　650　degrees　C　and　the　morphology　are　platelike　with　grain　sizes　of　about　40　nm.　Using　these　nano-particles,　the　dense　NBN　ceramics　were　fabricated　at　1100　degrees　C　for　2　h.　The　Curie　temperature　T-c　and　piezoelectric　coefficient　d(33)　at　room　temperature　for　the　present　ceramic　were　found　to　be　770　degrees　C　and　11　pC/N,　respectively.　Thermal　annealing　studies　indicate　that　the　NBN　ceramic　possesses　stable　piezoelectric　properties,　demonstrating　it　is　a　promising　candidate　for　high-temperature　applications.