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Orientation dependence of swift heavy ion track formation in potassium titanyl phosphate

Published online by Cambridge University Press:  18 May 2016

Yu-Jie Ma
Affiliation:
Department of Electronic Materials Engineering, Research School of Physics and Engineering, The Australian National University, Canberra ACT 2601, Australia; and School of Information Science and Engineering, Shandong University, Jinan, Shandong 250100, China
Pablo Mota Santiago
Affiliation:
Department of Electronic Materials Engineering, Research School of Physics and Engineering, The Australian National University, Canberra ACT 2601, Australia
Matias D. Rodriguez
Affiliation:
Department of Electronic Materials Engineering, Research School of Physics and Engineering, The Australian National University, Canberra ACT 2601, Australia
Felipe Kremer
Affiliation:
Department of Electronic Materials Engineering, Research School of Physics and Engineering, The Australian National University, Canberra ACT 2601, Australia
Daniel Schauries
Affiliation:
Department of Electronic Materials Engineering, Research School of Physics and Engineering, The Australian National University, Canberra ACT 2601, Australia
Boshra Afra
Affiliation:
Department of Electronic Materials Engineering, Research School of Physics and Engineering, The Australian National University, Canberra ACT 2601, Australia
Thomas Bierschenk
Affiliation:
Department of Electronic Materials Engineering, Research School of Physics and Engineering, The Australian National University, Canberra ACT 2601, Australia
David J. Llewellyn
Affiliation:
Department of Electronic Materials Engineering, Research School of Physics and Engineering, The Australian National University, Canberra ACT 2601, Australia
Fei Lu
Affiliation:
School of Information Science and Engineering, Shandong University, Jinan, Shandong 250100, China
Mark C. Ridgway
Affiliation:
Department of Electronic Materials Engineering, Research School of Physics and Engineering, The Australian National University, Canberra ACT 2601, Australia
Patrick Kluth*
Affiliation:
Department of Electronic Materials Engineering, Research School of Physics and Engineering, The Australian National University, Canberra ACT 2601, Australia
*
a) Address all correspondence to this author. e-mail: patrick.kluth@anu.edu.au
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Abstract

Potassium titanyl phosphate crystals in both x-cut and z-cut were irradiated with 185 MeV Au ions. The morphology of the resulting ion tracks was investigated using small angle x-ray scattering (SAXS), transmission electron microscopy (TEM), and atomic force microscopy (AFM). SAXS measurements indicate the presence of cylindrical ion tracks with abrupt boundaries and a density contrast of 1 ± 0.5% compared to the surrounding matrix, consistent with amorphous tracks. The track radius depends on the crystalline orientation, with 6.0 ± 0.1 nm measured for ion tracks along the x-axis and 6.3 ± 0.1 nm for those along the z-axis. TEM images in both cross-section and plan-view show amorphous ion tracks with radii comparable to those determined from SAXS analysis. The protruding hillocks covering the sample surface detected by AFM are consistent with a lower density of the amorphous material within the ion tracks compared to the surrounding matrix. Simulations using an inelastic thermal-spike model indicate that differences in the thermal conductivity along the z- and x-axis can partially explain the different track radii along these directions.

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Articles
Copyright
Copyright © Materials Research Society 2016 

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References

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