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Lead-free ceramics(Na0.52K0.4425Li0.0375)(Nb0.9625-xTa0.0375Sbx)O3(x=0.03,0.04,0.05,0.06)have been prepared by a conventional sintering process.Our results reveal that Li and Sb diffuse into the lattices to form a solid solution with a perovskite structure.The introduction of Sb shifts the ferroelectric tetragonal-ferroelectric orthorhombic phase transition temperature significantly to low temperatures.As a result,the ceramics have tetragonal phase at x >0.03.