In　this　paper,　(Bi0.5Na0.5)(0.94)Ba0.06Ti1-xZnxO3　ceramics　(0　＜=　x　＜=　0.06　)　were　prepared　by　the　solid　oxide　reaction　route.　The　doping　of　Zn2+　into　Bi0.5Na0.5TiO3-6BaTiO(3)　delays　the　crossover　from　nonergodic　to　ergodic　states,　and　the　thermal　depolarization　temperature　T-d　is　delayed　from　85　degrees　C　for　pure　samples　to　120　degrees　C　for　samples　doped　by　6%　Zn2+,　as　confirmed　by　temperature-dependent　dielectric　and　ferroelectric　measurements.　It　suggests　that　the　variation　of　the　T-d　could　be　ascribed　to　the　reformation　of　the　long-range　ferroelectric　order　due　to　the　large　ionic　polarizability　of　Zn2+.　The　high　ionic　polarizability　of　Zn2+　can　result　in　a　large　dipole　moment　of　BO6　octahedra,　thus　strengthening　the　coherence　of　neighboring　dipoles　and　suppressing　the　ferroelectric-relaxor　transition.　These　results　improve　our　understanding　on　the　thermal　depolarization　of　Bi0.5Na0.5TiO3-based　ferroelectrics.　Published　by　MP　Publishing.