The spinodal decomposition in the BST system

• Published in: Journal of alloys and compounds 2021-06, Vol.866, p.158871, Article 158871
• Main Authors: Shilkina, L.A., Nagaenko, A.V., Grin’, P.G., Sadykov, Kh.A., Khasbulatov, S.V., Dudkina, S.I., Reznichenko, L.A.
• Format: Article
• Language: English
• Subjects: Barium titanate; Barium titanates; Coherent scattering; Dielectric strength; Ferroelectricity; Nucleation; Permittivity; Phase diagrams; Phase transitions; Room temperature; Solid solutions; Spinodal decomposition; Strontium titanate; Strontium titanates; The phase diagram; The spinodal decomposition; The X-ray diffraction
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2021.158871

•The phase diagram of the Ba1-xSrxTiO3 system has been revised.•Splitting of diffraction peaks in the "cubic" phase occurs.•The changes of the substructure parameters indicate spinodal decomposition of solid solutions.•Giant values of low-frequency dielectric constants are observed. [Display omitted] A study of Ba1-xSrxTiO3 solid solutions (0.00 ≤ x ≤ 1.00) prepared by conventional ceramic technology have been performed. By the X-ray diffraction method, a discrepancy between the phase diagram (room temperature) of the quasi-binary system BaTiO3-SrTiO3 and the well-known phase diagram is established. According to the latter, at x ≈ 0.3, there is a transition from the tetragonal phase to the cubic phase. Our study revealed a splitting of diffraction peaks in the cubic phase (0.3