Ba(Ti,Zr)O3 solid solutions were prepared by a few alternative techniques: sol-precipitation, co-precipitation via oxalate route, the modified Pechini method and the classical solid state reaction procedure. For the three types of nanopowders prepared via wet-chemical techniques, thermal analysis results suggest that in the case of both the oxalate route and modified Pechini procedure, the formation kinetic of the BaTi0.85Zr0.15O3 solid solution is more rapid, requiring a lower thermal treatment temperature than that for the sol-precipitation synthesis. This book reviews research in the field of Ba(Ti,Zr)O3 functional materials.