Liu, YunWithers, Raymond2015-12-100015-0193http://hdl.handle.net/1885/58365This paper uses structured diffuse scattering to compare and contrast the local crystal structure behaviour of the normal ferroelectric BaTiO3 with a range of relaxor ferroelectric substituted BaTiO3 materials. The results strongly suggest that both normal ferroelectric BaTiO3 and the relaxor ferroelectric substituted BaTiO3's have the same underlying polarisation mechanism i.e. inherent 1-D correlated Ti cation and neighbouring O anion displacements forming 1-D dipole clusters (or polar nano regions). The role of the substituting ions is not to induce the PNR's but rather to suppress homogeneous strain distortion, transverse correlation of the 1-D PNR's and a transition into a long range ordered ferroelctric state.Keywords: BaTiO 3 ; ferroelectric; Long range; polar nano regions; Polarisation; Relaxor ferroelectric; Structural disorders; Structured diffuse scattering; Barium titanate; Crystal structure; Electron diffraction; Ferroelectricity; Perovskite; Polarizatio BaTiO3; electron diffraction; ferroelectric; polar nano regions; relaxor ferroelectric201010.1080/001501910036970392016-02-24