High-temperature solid-state reactions in the (1-x)Na0.5Bi0.5TiO3–xSrTiO3 system. Issue 4 (April 2018)

• Record Type: Journal Article
• Authors: Spreitzer, Matjaž; Meden, Anton; Suvorov, Danilo
• Is Part Of: Journal of the European Ceramic Society. Volume 38:Issue 4(2018)
• Page Start: 1399
• Page End: 1406
• Publication Date: 2018-04
• Subjects: Bi0.5Na0.5TiO3 -- Solid-state synthesis -- Ceramics -- High-temperature reactions -- Microstructure; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2017.09.043
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: High-temperature reactions during the solid-state synthesis of samples from the (1-x)Na0.5 Bi0.5 TiO3 –xSrTiO3 system were investigated. Due to the number of chemically different elements, the processing of these ceramics is delicate and requires several firing steps under specific conditions to obtain phase-pure samples. Sintering in an air atmosphere resulted in a macroscopically inhomogeneous microstructure, which is a consequence of incomplete reaction between different secondary phases. However, prolongation of the sintering time aggregated the pores in the sample, while at a higher firing temperature the sample's secondary phase melted. As a result, the nominal composition was altered, leading to the formation of the Na2 Ti6 O13 secondary phase. Sintering under an increased oxygen pressure of 1 MPa limited the evaporation of the secondary phase. This allowed the completion of the reaction, forming a homogeneous and dense sample. The study provides a set of experimental conditions for the successful preparation of ceramics from the investigated system.