A series of Ln(2)WO(6) (Ln = La, Nd, Sm, Eu, and Gd) ceramics were prepared through the solid state reaction route. The effects of rare-earth elements at Ln-site on the phase purity, crystal structure, and microwave dielectric properties were analyzed by XRD, Rietveld refinement, SEM and dielectric measurements. The nominal La2WO6 and Nd2WO6 would not form a single phase but exhibited mixed phases, whereas the Sm2WO6, Eu2WO6, and Gd2WO6 ceramics crystallized in a pure monoclinic crystal structure. The optimized microwave dielectric properties were obtained with epsilon(r) = 18.75, Qxf = 4350 GHz and tau(f) = -41.0 ppm/degrees C for Sm2WO6, epsilon(r) = 18.43, Qxf = 19,500 GHz, tau(f) = -44.1 ppm/degrees C for Eu2WO6, and epsilon(r) = 17.50, Qxf = 4400 GHz, tau(f)= -10.3 ppm/degrees C for Gd2WO6 sintered 1520 degrees C. The relationship between the composition and microwave dielectric properties were studied with respect to the ionic polarization and packing fraction. (C) 2017 Elsevier B.V. All rights reserved.