SANS investigation on evolution of pore morphology for varying sintering time in porous ceria |
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Authors: | A K Patra S Ramanathan D Sen S Mazumder |
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Institution: | (1) Solid State Physics Division, India;(2) Materials Science Division, Bhabha Atomic Research Centre, 400 085 Mumbai, India |
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Abstract: | Precipitates of ceria were synthesized by homogeneous precipitation method using cerium nitrate and hexamethylenetetramine
at 80°C. The precipitates were ground to fine particles of average size ∼0.7 μm. Circular disks with 10 mm diameter, 2 and
3 mm thickness were prepared from the green compacts by sintering at 1300° C for three different sintering times. Evolution
of the pore structures in these specimens with sintering time was investigated by small-angle neutron scattering (SANS). The
results show that the peak of the pore size distribution shifts towards the larger size with increasing sintering time although
the extent of porosity decreases. This indicates that finer pores are eliminated from the system at a faster rate than the
coarser ones as sintering proceeds and some of the finer pores coalesce to form bigger ones. |
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Keywords: | Ceramics neutron scattering porosity |
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