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Thermal conductivity of self-assembled nano-structured ZnO bulk ceramics

Journal of Applied Physics, ISSN: 0021-8979, Vol: 112, Issue: 3
2012
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Metrics Details

  • Citations
    20
    • Citation Indexes
      20
  • Captures
    22

Article Description

In this study, we describe the changes in thermal conductivity behavior of ZnO-Al micro- and nano-two-phase self-assembled composites with varying grain sizes. The reduction in thermal conductivity values of micro-composites was limited to ∼15 for ZnO-4 Al. However, nano-composites exhibited large reduction, by a factor of about three, due to uniform distribution of nano-precipitates (ZnAl O ) and large grain boundary area. Interestingly, the micro-composites revealed continuous decrease in thermal conductivity with increase in Al substitution while the nano-composites exhibited the lowest magnitudes for 2 Al concentration. Raman spectra indicated that phonon confinement in ZnO-Al nano-composites causes drastic decrease in the value of thermal conductivity. © 2012 American Institute of Physics.

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