DIELECTRIC AND FERROELECTRIC PROPERTIES OF Na 0.42 K 0.08 Bi 0.5 TiO 3 AND Na 0.25 K 0.25 Bi 0.5 TiO 3 RELAXOR CERAMICS.

Suchuan Zhao; Lina Zhang; Guorong Li; Baoshan Li; Aili Ding

Na 0.42 K 0.08 Bi 0.5 TiO 3 (NKBT16) and Na 0.25 K 0.25 Bi 0.5 TiO 3 (NKBT50) ceramics have been fabricated by the solid-state reaction. The dielectric responses show a tandem of relaxor-like anomalies, a broad maximum and a lower temperature hump. Temperature dependences of depolaration current of poled ceramics indicate that the lower temperature hump corresponds to the decay of spontaneous polarization. It is believed that at room temperature the ceramics would present polar clusters in a antiferroelectric matrix and electric field can suppress the relaxor behavior. NKBT50 exhibits a higher piezoelectric constant and a higher depolarization temperature. The use for device application has been indicated.

ELECTROMAGNETIC fields; ELECTRIC fields; DIELECTRICS; FERROELECTRICITY; SOLID state electronics

Integrated Ferroelectrics, 2006, Vol 78, Issue 1, p119

1058-4587

Academic Journal

10.1080/10584580600660058