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Formation mechanism and microstructure evolution of Ba 2 Ti 9 O 20 ceramics by reaction sintering method
Author(s) -
Luo Ting,
Yang Qihang,
Yu Hongtao,
Liu Jingsong
Publication year - 2020
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16777
Subject(s) - sintering , materials science , microstructure , ceramic , activation energy , titanium , scanning electron microscope , reaction mechanism , analytical chemistry (journal) , diffusion , barium , phase (matter) , chemical engineering , mineralogy , metallurgy , composite material , chemistry , catalysis , thermodynamics , biochemistry , physics , organic chemistry , chromatography , engineering
Ba 2 Ti 9 O 20 single‐phase ceramics were prepared by reaction sintering method using TiO 2 and BaCO 3 as raw materials after heat treating at 1150°C for 10 hours. Furthermore, the formation mechanism and microstructure evolution of Ba 2 Ti 9 O 20 ceramics prepared by reaction sintering method were investigated. The formation behavior of Ba 2 Ti 9 O 20 phase was analyzed from the perspective of diffusion, where the reaction activation energy required for the process was calculated to be about 386.17 kJ/mol. Combined with the scanning electron microscopy and the energy dispersive spectrometer, it was revealed that the pores on Ba 2 Ti 9 O 20 grains in the process of reaction sintering might be caused by the absence of oxygen element. Meanwhile, the reason for the roughness of ceramic surface was that the local inhomogeneous distribution of barium on the surface of Ba 2 Ti 9 O 20 grain leaded to the enrichment of titanium.