Giant dielectric response with reduced loss in ceramics with nominal composition of La1.5Sr0.5NiO4-SiO2

Abstract

Structures and dielectric properties of La 1.5 Sr 0.5 NiO 4 ceramics with different contents of SiO 2 additives were investigated. The La 1.5 Sr 0.5 NiO 4 particles were dispersed into SiO 2 matrixes via a sol-gel process, while the homogeneous distribution was destroyed by the reaction between La 1.5 Sr 0.5 NiO 4 and SiO 2 during the sintering process, so the composite ceramics consisted of La 1.5 Sr 0.5 NiO 4 , La 9.33 Si 6 O 26 and NiO phases. The dielectric constants at room temperature varied slightly, while the dielectric losses could be suppressed with a moderate amount of SiO 2 additive. Temperature-independent giant dielectric constant with low loss was achieved in the ceramics with nominal composition of La 1.5 Sr 0.5 NiO 4 -0.80SiO 2 . Based on the analysis of impedance spectra, the giant dielectric response in the composite ceramics was attributed to the combination of the small polaronic hopping and Maxwell-Wagner effect.

Effect of sintering conditions on colossal dielectric properties of (Tb1/2Nb1/2)0.01Ti0.99O2ceramics

“…Recently, colossal permittivity (CP) oxides with ε′ > 10 4 have gained attention due to their potential to advance electronic technologies [1,2]. Extensive studies have been conducted on various CP oxide systems, including CaCu 3 Ti 4 O 12 (CCTO) [3][4][5], BaTiO 3 -based materials [6,7], La 2-x Sr x NiO 4 (LSNO) [8], and co-doped NiO [9,10]. Unfortunately, these systems encounter limitations in practical applications.…”