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Effects of additives on the phase formation and microstructural evolution of Ba2Ti9O20 microwave ceramic by Sea-Fue Wang; Thomas C.K. Yang; Chuang-Chung Chiang; Stanley H.Y. Tsai is a Materials Science article available to read on EtoBox.

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Preparation of dense and phase-pure Ba 2 Ti 9 O 20 is generally difficult using solid state reaction, since there are several thermodynamically stable compounds in the vicinity of the desired composition and a curvature of Ba 2 Ti 9 O 20 equilibrium phase boundary in the BaO-TiO 2 system at high temperatures. It was reported that a small amount of solid solution additives is essential for the formation of a pure Ba 2 Ti 9 O 20 phase, however, contradictory results were also addressed in the literature. In this study, TiO 2, MnO, and ZrO 2 , were used to investigate the effects of additives on the densification, microstructural evolution and phase stability of Ba 2 Ti 9 O 20 . With the addition of 2.8 wt.% TiO 2 and sintering at 1200 C, ceramic yielded a pure Ba 2 Ti 9 O 20 phase. It indicates that Ba 2 Ti 9 O 20 is a nonstoichiometric compound, which can accommodate an excess amount of TiO 2 . With the addition of 4 wt.% ZrO 2 , phase pure Ba 2 Ti 9 O 20 was obtained in the sintering temperatures of 1200 C and 1300 C. Results also indicated that MnO addition could promote the formation of Ba 2 Ti 9 O 20 , compared with that of pure host material, though pure Ba 2 Ti 9 O 20 was not

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Author

Sea-Fue Wang; Thomas C.K. Yang; Chuang-Chung Chiang; Stanley H.Y. Tsai

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0272-8842)

Published

2003

Language

EN

Field

Materials Science (Physical Sciences)