NDLI: Influence of the Grain Boundaries on the Heat Transfer in Laser Ceramics

Content Provider	Springer Nature Link
Author	Bisson, Jean Francois Yagi, Hideki Yanagitani, Takakimi Kaminskii, Alexander Barabanenkov, Yuri N. Ueda, Ken Ichi
Copyright Year	2007
Abstract	Grain boundaries play a key role in determining several key properties of polycrystalline laser ceramics. Heat transfer measurements at low temperature constitute a good tool to probe grain boundaries. We review the results of heat transfer measurements in polycrystalline Y3Al5O12 garnets as well as Y2O3 and Lu2O3 sesquioxide materials obtained by self-energy-driven sintering of nano-particles. The average phonon mean free path in Y3Al5O12 was found to be significantly larger than the average grain size and to scale with temperature as T −2 at low temperature. Existing models describing the interaction between phonons and grain boundaries are reviewed. Correct temperature dependence of the mean free path and order of magnitude of scattering rates were found by assuming the existence of a grain boundary layer having acoustic properties different from those of the bulk. A different temperature dependence of phonon mean free path was found for the sesquioxides and was ascribed to the stronger elastic anisotropy of these materials. The thermal resistance associated to the grain boundaries of laser ceramics was found to be lower than in other dense polycrystalline ceramic materials reported in the literature.
Starting Page	1
Ending Page	13
Page Count	13
File Format	PDF
ISSN	13406000
Journal	Optical Review
Volume Number	14
Issue Number	1
e-ISSN	13499432
Language	English
Publisher	Springer-Verlag
Publisher Date	2007-01-01
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	laser ceramics garnets sesquioxides grain boundaries thermal conductivity phonons Electromagnetism, Optics and Lasers
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics

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