The synthesis of the title compounds from 4BaO 2 :M 2 CO 3 :5Nb 2 O 5 (M: K, Na, Li) powder mixtures by mechanical treatment (planetary mill, 10-24 h) and subsequent annealings is monitored by powder XRD, thermal analysis, and SEM. The obtained samples transform to very crystalline powders by heating at temperatures as moderate as 600°C. Dielectric characterization shows that the substitution of K for Na or Li increases the dielectric permittivity and decreases both the dielectric loss factor and the ferro-paraelectric phase transition. This makes these ceramics good candidates for uses as high permittivity materials. -(KHACHANE, M.; MOURE, A.; ELAATMANI, M.; ZEGZOUTI, A.; DAOUD, M.; CASTRO*, A.; J.

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