Ceramics of solid solution compositions in the system BaTi1-x-ySnxZryO3 have been fabricated using conventional mixed oxide processing routes. Samples with y = 0 or 0.01 exhibited maximum relative permittivities, epsilon(r)max of approximately 65 000 and approximately 62 000 respectively. The Curie peaks became broader and epsilon(max)r decreased with increasing zirconium substitutions. The Curie temperature decreased linearly from 35-degrees-C for y = 0 to -40-degrees-C for y = 0.11 : for the latter, epsilon(r)max was equal to approximately 20000. The results are interpreted on the basis of microstructural features and on the degree of compositional inhomogeneity in the system.