Structure‐property relationships in BiScO3–PbTiO3–PbMg1/3Nb2/3O3 ceramics near the morphotropic phase boundary

• Published in: Journal of the American Ceramic Society Vol. 101; no. 2; pp. 683 - 693
• Main Authors: Talanov, Mikhail V., Bush, Alexander A., Кamentsev, Konstantin E., Sirotinkin, Vladimir P., Segalla, Andrei G.
• Format: Journal Article
• Language: English
• Published: Columbus Wiley Subscription Services, Inc 01.02.2018
• Subjects: Ceramics; Dielectric properties; Ferroelectric materials; Ferroelectricity; ferroelectricity/ferroelectric materials; perovskites; phase transformations; Phase transitions; piezoelectric materials/properties; Piezoelectricity; relaxors; Solid phases; Solid solutions
• ISSN: 0002-7820; 1551-2916
• DOI: 10.1111/jace.15225

The phase structure, dielectric, ferroelectric, and piezoelectric properties of (1−2x)BiScO3–xPbTiO3–xPbMg1/3Nb2/3O3 ceramics (x = 0.30‐0.46) were studied. It was found that an increase in x leads to a structural phase transition between the rhombohedral and tetragonal phase via an intermediate monoclinic phase and to a crossover from the nonergodic relaxor state to the ferroelectric one. It was proposed that at x > 0.42 the phase transition changes from second to first order. The assumption about the existence of a tricritical point on the phase diagram at x ≈ 0.42 with the enhanced dielectric response has been made. The observed structure‐property relationships of the studied solid solutions are discussed. It is shown that the solid solutions with x = 0.42 are characterized by the high piezoelectric parameters (d33 = 509 pC/N, d31 = −178 pC/N, dh = 153 pC/N), which makes possible their applications in sonar equipment.