Lattice Expansion in Metal Oxide Nanoparticles: MgO, Co3O4, & Fe3O4

Philip P. Rodenbough, Chengjunyi Zheng, Yuxuan Liu, Chenyuan Hui, Yuxuan Xia, Ziying Ran, Yanjun Hu, Siu Wai Chan

Research output: Contribution to journalArticlepeer-review


Uniform sets of mono-crystalline nanoparticles ranging from 6 nm to over 100 nm were prepared for the MgO, Co3O4, and Fe3O4 oxide systems. The nanoparticles were characterized by transmission electron microscopy (TEM) and x-ray diffraction (XRD). A careful analysis shows increased lattice parameter for smaller nanoparticles of each oxide system: 0.47% expansion from bulk for 7 nm MgO crystallites, 0.15% expansion from bulk for 9 nm Co3O4 crystallites, and 0.13% expansion from bulk for 6 nm Fe3O4 crystallites. The compressive surface stresses and expansion energies against hydrostatic pressure for each oxide system were calculated, respectively, to be 4.13 N/m and 1.8 meV/formula unit for MgO, 3.09 N/m and 0.87 meV/formula unit for Co3O4, and 1.26 N/m and 0.67 meV/formula unit for Fe3O4. The fundamental understanding of oxide nanoparticle mechanics as presented here will facilitate integration of these materials into technological applications in a rationally designed manner.

Original languageEnglish (US)
Pages (from-to)384-392
Number of pages9
JournalJournal of the American Ceramic Society
Issue number1
StatePublished - 2017


  • cobalt/cobalt compounds
  • crystals/crystallization
  • iron/iron compounds
  • magnesium oxide
  • nanomaterials

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry


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