Synthesis and characterization of nanocrystalline mullite powders at low annealing temperature using a new technique

For the first time orthorhombic mullite nanoparticles (12nm) have been synthesized via the co-precipitation technique using mixture of sodium aluminate and sodium silicate solutions as monophasic salts at low annealing temperature 1000°C. The AC and DC electrical properties of the sintered mullite c...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2012-12, Vol.32 (16), p.4249-4255
Main Authors: Sanad, M.M.S., Rashad, M.M., Abdel-Aal, E.A., El-Shahat, M.F.
Format: Article
Language:English
Subjects:
Annealing
Ceramics
Coprecipitation
Dielectric loss
Direct current
Electrical properties
Grain size
Mullite
Processing
Sintering
Structure and microstructure
Surfactants
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Summary:For the first time orthorhombic mullite nanoparticles (12nm) have been synthesized via the co-precipitation technique using mixture of sodium aluminate and sodium silicate solutions as monophasic salts at low annealing temperature 1000°C. The AC and DC electrical properties of the sintered mullite ceramics were investigated. The results indicated the precursor directly transformed to 3:2 molar ratio orthorhombic mullite. Meanwhile, the surface area of the produced o-mullite at 1000°C was 15.1m2/g which increased to 37.3m2/g with addition of CTAB as a cationic surfactant. TEM images investigated that the microstructure was changed from rod-like shape to roughly spherical shape with addition of surfactant. The DC electrical resistivity of mullite sample sintered at 1600°C was 16 times greater than that sintered at 1300°C. The minimum dielectric loss value of 0.014 was obtained at 1600°C sintering temperature at 1.5MHz.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2012.07.014