Effect of heat treatment on pore structure in nanocrystalline NiO: A small angle neutron scattering study |
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| Authors: | J Bahadur D Sen S Mazumder S Ramanathan |
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| Institution: | (1) Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai, 400 085, India;(2) Materials Science Division, Bhabha Atomic Research Centre, Mumbai, 400 085, India |
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| Abstract: | Nanocrystalline nickel oxide powders were calcined at 300, 600 and 900°C and pore structure evolution was followed by small
angle neutron scattering (SANS). Pore size distributions at two widely separated size ranges have been revealed. Shrinkage
of larger-sized pore with reduction in polydispersity has been observed with increasing heat treatment temperature. The pore
structures at various heat treatment temperatures do not scale. This has been attributed to the grain boundary diffusion leading
to an asymmetric shrinkage of the pores.
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| Keywords: | Nanoceramics small angle neutron scattering sintering NiO |
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