标题：Orientation dependence of swift heavy ion track formation in potassium titanyl phosphate
作者：Ma, Yu-Jie; Santiago, Pablo Mota; Rodriguez, Matias D.; Kremer, Felipe; Schauries, Daniel; Afra, Boshra; Bierschenk, Thomas; Llewellyn, 更多 作者机构：[Ma, Yu-Jie; Santiago, Pablo Mota; Rodriguez, Matias D.; Kremer, Felipe; Schauries, Daniel; Afra, Boshra; Bierschenk, Thomas; Llewellyn, David J.; Rid 更多
通讯作者地址：[Kluth, P]Australian Natl Univ, Res Sch Phys & Engn, Dept Elect Mat Engn, Canberra, ACT 2601, Australia.
来源：JOURNAL OF MATERIALS RESEARCH
关键词：ion-solid interactions; defects
摘要：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.