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

Yu Zhao, Yongke Yan, Ashok Kumar, Hsin Wang, Wallace D. Porter, Shashank Priya

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

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 2O 4) 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.

Original languageEnglish (US)
Article number034313
JournalJournal of Applied Physics
Volume112
Issue number3
DOIs
StatePublished - Aug 1 2012

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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