Precipitate orientation relationships in Pt-implanted sapphire

Santala, Melissa K.; Radmilović, Velimir; Giulian, Raquel; Ridgway, Mark C; Glaeser, Andreas M.; Gronsky, R.

doi:10.1016/j.scriptamat.2009.10.023

Cited by 11 publications

(12 citation statements)

References 14 publications

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“…In a prior study, when sapphire was cooled with lN2 during Pt implantation an amorphous surface layer estimated to be ≈ 200 nm thick resulted [25]. In the present study, applying similar implantation conditions to PCA an 240-nm thick amorphized surface layer developed.…”

Section: Post-implantation Characterization Of Pcasupporting

confidence: 60%

“…The substrates were not misaligned in order to reduce the orientation-dependence. For implantation with heavy ions the SRIM predictions match experimental implantation depths well, while for medium-light ions (Ar + , Al + , Mg + , He + ) the implantation depth was 15% larger than estimated by SRIM [24,25,26]. In a comparative investigation of ion implantation into sapphire and PCA, the space-charge layer was disturbed by ion implantation, altering the nature of the charge balance and distribution in the near-grain-boundary regions in PCA.…”

Section: Metal Implantationmentioning

confidence: 99%

“…The equilibrium shape of Pt in ! -Al2O3 has not been determined, however, a limited spectrum of preferred Pt-Al2O3 ORs can be deduced from thin-film experiments as well as from prior investigations of Ptimplanted sapphire [25,41,45,46,47,48,49,50,51]. [25,41,51].…”

Section: Platinum and Alumina Equilibrium Morphologiesmentioning

confidence: 99%

“…The polished substrates were maintained at lN2 temperature, and implanted with 600 keV Pt ions at a 7° incident angle with fluence of 1.3!10 16 Pt + ions/cm 2 , duplicating conditions previously applied to singlecrystal sapphire substrates [25,41].…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

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Microstructural evolution in Pt-implanted polycrystalline Al2O3

et al. 2015

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Microstructural evolution in the near-surface layer of a model metal-ceramic system, Ptimplanted high-purity polycrystalline Al2O3 (PCA), was studied, and compared to that in Ptimplanted sapphire. Interactions between Pt particles and migrating ! /! grain boundaries in PCA caused Pt particle redistribution and Pt loss, and were evaluated in the context of Zenerpinning and particle-drag theories. The experimental method allows the transition from the original to the new equilibrium shape due to the changes in orientation relationship (OR) to be examined. As a result of the potentially wide range of equilibrium shapes, interface crystallographies, and transitional morphologies the microstructural evolution imposes, the experimental method provides a flexible framework for fundamental studies of the energetic and kinetic properties of ceramic-metal interfaces.

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Section: Post-implantation Characterization Of Pcasupporting

confidence: 60%

Section: Metal Implantationmentioning

confidence: 99%

Section: Platinum and Alumina Equilibrium Morphologiesmentioning

confidence: 99%

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

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Microstructural evolution in Pt-implanted polycrystalline Al2O3

et al. 2015

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“…The nano-precipitates (<100nm diameter) were formed in sapphire by high-energy ion implantation followed by thermal annealing in air. Processing parameters anticipated to yield a large number of Pt precipitates with the orientation relationship (0001) sapphire ||(111) Pt ; [1010] sapphire ||[110] Pt [4,5] were used to produce the specimens. The presence of large numbers of precipitates with this relatively high-symmetry orientation relationship increased the likelihood that interfaces could be studied with both phases simultaneously on a low-index zone axis, as in FIG 1.…”

mentioning

confidence: 99%

Atomic-Resolution Characterization of Oxide-Metal Interfaces in Pt Precipitates in Sapphire Annealed at 1600°C

et al. 2010

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Despite efforts to characterize ceramic-metal interfaces, e.g. [1][2][3], the understanding of such structures lags far behind that of bulk constituents. The detailed study of a model system -platinum in sapphire (single crystal α-alumina) -was motivated by this relative dearth of information on the structure of metal-oxide interfaces. Platinum precipitates in sapphire that had been annealed at 1600°C in air were imaged with the TEAM 0.5 microscope at the National Center for Electron Microscopy. Atomic-resolution phase-contrast images of the sapphire-Pt interfaces were produced and exit wave reconstructions of through-focal series (FIG 1) were compared to simulated images to extract quantitative information about structure and bonding at the interfaces. The nano-precipitates (<100nm diameter) were formed in sapphire by high-energy ion implantation followed by thermal annealing in air. Processing parameters anticipated to yield a large number of Pt precipitates with the orientation relationship (0001) [4,5] were used to produce the specimens. The presence of large numbers of precipitates with this relatively high-symmetry orientation relationship increased the likelihood that interfaces could be studied with both phases simultaneously on a low-index zone axis, as in FIG 1. The information derived from the highresolution imaging and analysis will be related to a quantitative description of the precipitate morphology [6].

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