Influence of solid loading on densification behavior, micromorphology and dielectric properties of Ba0.67Sr0.33TiO3 ceramics fabricated by a novel DCC-HVCI method. Issue 11 (1st August 2020)

• Record Type: Journal Article
• Authors: Lu, Lu; Chen, An-Nan; Cheng, Li-Jin; Wu, Jia-Min; Liu, Rong-Zhen; Chen, Ying; Shi, Yu-Sheng
• Is Part Of: Ceramics international. Volume 46:Issue 11(2020)Part B
• Page Start: 19015
• Page End: 19021
• Publication Date: 2020-08-01
• Subjects: Dielectric properties -- Solid loading -- Ba0.67Sr0.33TiO3 -- Densification behavior -- Microstructure -- DCC-HVCI; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2020.04.231
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Ba0.67 Sr0.33 TiO3 (BST) ceramics with highly improved dielectric performance were fabricated by a novel direct coagulation casting via high valence counter ions (DCC-HVCI) method. The influence of solid loading on densification behavior, micromorphology, and dielectric performance of the samples was investigated. With the increase of solid loading from 40 to 50 vol%, the maximum densification rate of BST ceramics increased from 0.090 to 0.122 s −1, and the densification temperature decreased from 1424 to 1343 °C, which indicated that high solid loading could promote the densification behavior of samples during sintering. BST ceramics fabricated by the DCC-HVCI method showed uniform grain size and microstructure, which was beneficial for the dielectric properties of BST ceramics. Samples obtained from 45 vol% suspensions possessed the lowest dielectric permittivity (εr ≈ 2801), and the dielectric loss (tanδ≈0.0262) was about 1/10 of that of dry-pressed samples (tanδ≈0.301), which could be attributed to the composition homogenization.