Relaxor ferroelectricity in ceramics with composition Ba1−xKx(Ti1−xNbx)O3

• Published in: Materials letters Vol. 36; no. 1-4; pp. 81 - 84
• Main Authors: Ravez, J, Simon, A
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 1998; Elsevier
• Subjects: Ba1−xKx(Ti1−xNbx)O3; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Dielectrics, piezoelectrics, and ferroelectrics and their properties; Exact sciences and technology; Ferroelectricity and antiferroelectricity; Lead-free ceramics; Phase transitions and curie point; Physics; Relaxor ferroelectric; Lead-free ceramics; Ba1−xKx(Ti1−xNbx)O3; Relaxor ferroelectric; Dielectric dispersion; Temperature dependence; Frequency dependence; Inorganic compounds; Transition element compounds; Curie-Weiss law; Relaxor; Experimental study; Oxide ceramics; Titanium oxides; Ferroelectric transitions; Multi-element compounds; Ferroelectric materials; Barium oxides; Sintering; Preparation; Niobium oxides; Potassium oxides; Chemical composition; Permittivity
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/S0167-577X(98)00008-1

Ceramics sintered at temperatures in the range 1200–1400°C and with composition Ba1−xKx(Ti1−xNbx)O3 (0.04≤x≤0.20) show a relaxor ferroelectric behaviour. All the corresponding dielectric characteristics, i.e., diffusivity of the ferroelectric–paraelectric transition, frequency dispersion of εr′, shift of Tm with frequency deviation from the Curie–Weiss law, are determined. The behaviour is all the more relaxor because the composition deviates from BaTiO3. This study shows the preparation of lead-free relaxor ceramics, which promotes environmental protection.