High-temperature dielectric relaxations in (Ce, Y) codoped BaZrO3 ceramics. (5th April 2019)

• Record Type: Journal Article
• Authors: Suhaib, S A; Zhu, A K; Sun, J; Guo, Y M; Wang, S T; Wang, C C
• Is Part Of: Materials research express. Volume 6:Number 7(2019)
• Publication Date: 2019-04-05
• Subjects: glycine nitrate process -- dielectric relaxation -- ionic conductivity; Materials science -- Research -- Periodicals; Materials science -- Periodicals; 620.11
• DOI: 10.1088/2053-1591/ab10be
• Languages: English
• ISSNs: 2053-1591

Abstract

Abstract: (Ce, Y) codoped BaZrO3 ceramics, BaZr0.1 Ce0.7 Y0.2 O3-δ and BaZr0.4 Ce0.4 Y0.2 O3-δ ceramics were synthesized via solution combustion based on the glycine nitrate process. The dielectric properties of the samples have been investigated in the temperature range from 300 to 1000 K and frequency range from 10 2 Hz to 10 6 Hz. It is observed that the samples exhibit colossal dielectric behavior in the temperature below ∼600 K. The colossal dielectric behavior is composed of two sets of relaxations with the low- and high-temperature relaxations being caused by the dipole pairs of V O -Y and OH O -Y, respectively. In the temperature higher than ∼600 K, the samples show two dielectric anomalies with extremely large dielectric permittivity over 10 6 . It is argued that the low-temperature dielectric anomaly is the typical pseudo-relaxor behavior caused by ion-hopping-motion. While the high-temperature dielectric anomaly results from the negative capacitance effect.