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A comparison of phases and the microstructures of textured Sr 0.4 Ba 0.6 Nb 2 O 6  ceramics without and with V 2 O 5  addition was carried out using transmission and analytical electron microscopy. The dopant was not found in Sr 0.4 Ba 0.6 Nb 2 O 6  grains but in the inter-granular regions, including both grain boundary and second phase. Grain boundaries in the sample without V 2 O 5  are clean, but those in the V 2 O 5 -doped sample exhibit a variety of structures, with and without an amorphous film of variable thickness. In general the vanadium excess follows the same trend of film width, while the Sr excess is generally negative and the Ba excess is positive, suggesting that the amorphous films at grain boundaries are rich in V and Ba and deficient in Nb and Sr. The second phase was determined as Ba 3 V 4 O 13  phase containing small amounts of Sr and Nb. Such V- and Ba-rich inter-granular liquids promoted the densification and texturing, and affected the dielectric constant at low frequency but not the Curie temperature.

Effect of V 2 O 5 doping on the microstructure and local composition of textured Sr 0.4 Ba 0.6 Nb 2 O 6 ceramics