Surface-Energy-Anisotropy-Induced Orientation Effects on RayleighInstabilities in Sapphire

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Arrays of controlled-geometry, semi-infinite pore channels of systematically varied crystallographic orientation were introduced into undoped m-plane (10{bar 1}0) sapphire substrates using microfabrication techniques and ion-beam etching and subsequently internalized by solid-state diffusion bonding. A series of anneals at 1700 C caused the breakup of these channels into discrete pores via Rayleigh instabilities. In all cases, channels broke up with a characteristic wavelength larger than that expected for a material with isotropic surface energy, reflecting stabilization effects due to surface-energy anisotropy. The breakup wavelength and the time required for complete breakup varied significantly with channel orientation. For most orientations, the instability ... continued below

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Santala, Melissa & Glaeser, Andreas M. January 1, 2006.

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Arrays of controlled-geometry, semi-infinite pore channels of systematically varied crystallographic orientation were introduced into undoped m-plane (10{bar 1}0) sapphire substrates using microfabrication techniques and ion-beam etching and subsequently internalized by solid-state diffusion bonding. A series of anneals at 1700 C caused the breakup of these channels into discrete pores via Rayleigh instabilities. In all cases, channels broke up with a characteristic wavelength larger than that expected for a material with isotropic surface energy, reflecting stabilization effects due to surface-energy anisotropy. The breakup wavelength and the time required for complete breakup varied significantly with channel orientation. For most orientations, the instability wavelength for channels of radius R was in the range of 13.2R-25R, and complete breakup occurred within 2-10 h. To first order, the anneal times for complete breakup scale with the square of the breakup wavelength. Channels oriented along a <11{bar 2}0> direction had a wavelength of {approx} 139R, and required 468 h for complete breakup. Cross-sectional analysis of channels oriented along a <11{bar 2}0> direction showed the channel to be completely bounded by stable c(0001), r{l_brace}{bar 1}012{r_brace}, and s{l_brace}10{bar 1}1{r_brace} facets.

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  • Journal Name: Surface Science; Journal Volume: 600; Journal Issue: 4; Related Information: Journal Publication Date: 02/15/2006

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  • Report No.: LBNL--58793
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.1016/j.susc.2005.11.038 | External Link
  • Office of Scientific & Technical Information Report Number: 891211
  • Archival Resource Key: ark:/67531/metadc883630

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  • January 1, 2006

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  • Sept. 21, 2016, 2:29 a.m.

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  • Sept. 30, 2016, 2:32 p.m.

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Santala, Melissa & Glaeser, Andreas M. Surface-Energy-Anisotropy-Induced Orientation Effects on RayleighInstabilities in Sapphire, article, January 1, 2006; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc883630/: accessed July 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.