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 journalArticle

11 Citations (Scopus)

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

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thermal conductivity
ceramics
composite materials
precipitates
grain boundaries
grain size
substitutes
Raman spectra
causes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Zhao, Yu ; Yan, Yongke ; Kumar, Ashok ; Wang, Hsin ; Porter, Wallace D. ; Priya, Shashank. / Thermal conductivity of self-assembled nano-structured ZnO bulk ceramics. In: Journal of Applied Physics. 2012 ; Vol. 112, No. 3.
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Thermal conductivity of self-assembled nano-structured ZnO bulk ceramics. / Zhao, Yu; Yan, Yongke; Kumar, Ashok; Wang, Hsin; Porter, Wallace D.; Priya, Shashank.

In: Journal of Applied Physics, Vol. 112, No. 3, 034313, 01.08.2012.

Research output: Contribution to journalArticle

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