Journal of Materials Science

, Volume 27, Issue 16, pp 4329–4332 | Cite as

Morphology of molybdena fractal clusters grown by vapour-phase deposition

  • Ji -Zhong Zhang
  • Delu Liu


Molybdena fractal clusters of various shapes were obtained experimentally in an evaporation-deposition system. The open ramified deposits grew after heating MoO3 powder at 750–900 °C for 0.5–2 h. They demonstrate two structural forms: the stack-like formation and the net-like one. Scanning electron microscopy observations revealed that the clusters consist of one of three different microstructures: needle-like whiskers, ribbon-like crystals, and fascicular crystals. Each pattern displays the microscopical anisotropy although they are of macroscopical self-similar feature. A nucleation-aggregation model is suggested to explain the non-equilibrium growth processes.


Polymer Microstructure Microscopy Electron Microscopy Scan Electron Microscopy 
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Copyright information

© Chapman & Hall 1992

Authors and Affiliations

  • Ji -Zhong Zhang
    • 1
    • 2
  • Delu Liu
    • 3
  1. 1.Department of Materials Science and EngineeringTsinghua UniversityBeijing
  2. 2.Center of Condensed Matter and Radiation PhysicsCCAST (World Laboratory)BeijingPeople’s Republic of China
  3. 3.Department of Materials PhysicsUniversity of Science and Technology BeijingBeijingPeople’s Republic of China

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