Synthesis, X-ray diffraction and dielectric studies of the ceramic samples (1−x)BaTiO3⋅xPbFe2/3W1/3O3 (0≤x≤1) system

• Published in: Journal of advanced dielectrics 2024-12, Vol.14 (6)
• Main Authors: Fedulov, D. Yu, Kamentsev, K. E., Bush, A. A., Kozlov, V. I.
• Format: Article
• Language: English
• ISSN: 2010-135X; 2010-1368
• DOI: 10.1142/S2010135X24500024

Ceramic samples of the ( 1 − x )BaTiO3⋅xPbFe 2 / 3 W 1 / 3 O3, 0 ≤ x ≤ 1 (( 1 − x )BT⋅xPFW) system were synthesized by solid-state reactions method. The samples were characterized by X-ray diffraction (XRD) and dielectric studies, as well as by the measurements of the thermally stimulated depolarization currents (TSDC). It was found that the predominant phase in the samples is presented by the (Ba 1 − x Pbx)(Ti 1 − x Fe 2 x / 3 W x / 3 )O3 solid solutions with a perovskite structure, herewith the samples with 0 ≤ x < 0 . 2 5 are practically single-phase, and with 0 . 2 5 ≤ x < 1 contain the impurity phase BaWO4 (up to 15 mass.% at x = 0 . 6 0 –0.90). Information has been obtained about the changes in the structural and dielectric characteristics of the solid solutions with the change of their composition. It is established that the solid solutions crystal lattice symmetry at 296 K changes from tetragonal at x ≤ 0 . 0 4 to cubic at x ≥ 0 . 0 5 . An increase in the PFW content in solid solutions causes a gradual change in their properties from ferroelectric at 0 ≤ x < 0 . 1 0 to relaxor ferroelectric at 0 . 1 0 ≤ x ≤ 0 . 2 5 , and then to properties similar to those of the dipole glass with weak or zero correlation between dipoles at 0 . 2 5 < x ≲ 0 . 9 0 . The addition of BT to PFW leads to rather quick degradation of the relaxor ferroelectric properties of PFW in the region x = 0 . 9 –1.0.