 Strontium Barium Niobate is one of the few tetragonal tungsten bronze compounds without volatile elements making it a useful system for probing structure-property relations.Strontium Barium Niobate is a normal ferroelectric for Barium-rich compositions and becomes a relaxor ferroelectric with increasing strontium content.This has been attributed to positional disorder of the A-site cations  alongside incommensurate oxygen octahedral tilting