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Preparation of Dense BaTiO 3 Ceramics from Sol‐Gel‐Derived Monolithic Gels
Author(s) -
Shimooka Hirokazu,
Kuwabara Makoto
Publication year - 1995
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/j.1151-2916.1995.tb08066.x
Subject(s) - materials science , sintering , relative density , sol gel , ceramic , barium titanate , chemical engineering , grain size , barium , dielectric , solvent , composite material , mineralogy , nanotechnology , metallurgy , chemistry , organic chemistry , optoelectronics , engineering
Dense, small‐grained BaTiO 3 ceramics, with a grain size around 1 μm and a relative sintered density >98%, were obtained at 1100°C from sol‐gel‐derived gel monoliths without using any sintering additives. The monolithic gels asprepared had a relative density of about 50% and consisted of ultrafine pseudo‐cubic BaTiO 3 particles (<50 nm). These gels, with a significantly high density compared with that of previous ones (∼30%), have been synthesized at room temperature from a sol solution with a concentration of equimolar mixture of titanium isopropoxide and barium ethoxide (0.8 mol/L), using the methanol/2‐methoxyethanol mixed‐solvent system. Microstructural development of the gel monoliths with increasing sintering temperature and the dielectric properties of the obtained dense BaTiO 3 ceramic have been investigated.