Morphology of pores and interfaces and mechanical behavior of nanocluster-assembled silicon nitride ceramic

Rajiv K. Kalia, Aiichiro Nakano, Kenji Tsuruta, Priya Vashishta

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Million atom molecular-dynamics simulations are performed to investigate the structure, dynamics, and mechanical behavior of cluster-assembled Si3N4 These solids contain highly disordered interfacial regions with 50% undercoordinated atoms. Systems sintered at low pressures have percolating pores whose surface morphologies are well characterized by two values of the roughness exponent, 0.46 and 0.86; these are close to the experimental values found by Bouchaud et al. for fracture surfaces. Results for elastic moduli are consistent with a three-phase model for heterogeneous materials.

Original languageEnglish
Pages (from-to)689-692
Number of pages4
JournalPhysical Review Letters
Issue number4
Publication statusPublished - 1997
Externally publishedYes


ASJC Scopus subject areas

  • Physics and Astronomy(all)

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