Low-temperature fabrication of BaBi2Nb2O9 ceramics by reaction controlled sintering

• Published in: Journal of materials science. Materials in electronics Vol. 21; no. 3; pp. 302 - 308
• Main Authors: Shigyo, Tatsuhiro, Itoh, Hidenobu, Takahashi, Junichi
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01.03.2010; Springer
• Subjects: Calcination; Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Cross-disciplinary physics: materials science; rheology; Density; Discs; Electronics; Exact sciences and technology; Materials Science; Materials synthesis; materials processing; Optical and Electronic Materials; Physics; Powder compacts; Precursors; Sintering (powder metallurgy); Conventional Solid State Reaction; Nb2O5; Bi2O3; Precursor Powder; BaCO3; Reaction sintering; Powders; Niobium oxide; Calcination; Powder compaction; Ceramics; Heat treatments
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-009-9910-7

Reaction controlled sintering was applied to the fabrication of BaBi 2 Nb 2 O 9 (BBN) ceramics at lower temperature. A powder mixture of BaCO 3 and Nb 2 O 5 was heated at 600 °C in a 1st step calcination to produce a binary precursor of BaNb 2 O 6 . The pre-heated powder was then mixed with a fixed amount of Bi 2 O 3 , which was subsequently pressed into a disk pellet. After a powder compact of the mixture was subjected to heating at 950 °C for 4 h, a BBN bulk sample with a relative density of 92% was successfully obtained. The low-temperature fabrication of dense BBN ceramics could be attributed to the inhibited formation of an intermediate phase of Ba 5 Nb 4 O 15 and the production of submicron powder with an appropriate reactivity during a 1st step calcination.