Phase transformation and chemical decomposition of nanocrystalline SnO2 under heavy ion irradiation

被引:2
作者
Cusick, Alex B. [1 ]
Lang, Maik [2 ]
Zhang, Fuxiang [3 ]
Zhang, Jiaming [4 ]
Kluth, Patrick [5 ]
Trautmann, Christina [6 ,7 ]
Ewing, Rodney C. [1 ,3 ,4 ]
机构
[1] Univ Michigan, Mat Sci & Engn, Ann Arbor, MI 48109 USA
[2] Univ Tennessee, Nucl Engn, Knoxville, TN 37996 USA
[3] Univ Michigan, Earth & Environm Sci, Ann Arbor, MI 48109 USA
[4] Stanford Univ, Geol Sci, Stanford, CA 94305 USA
[5] Australian Natl Univ, Res Sch Phys & Engn, Canberra, ACT 2601, Australia
[6] GSI Helmholtz Ctr Heavy Ion Res, D-64291 Darmstadt, Germany
[7] Tech Univ Darmstadt, D-64287 Darmstadt, Germany
基金
美国能源部; 澳大利亚研究理事会;
关键词
Swift heavy ions; Irradiation; Phase transformation; Tin oxide; Nanocrystalline; Decomposition; Reduction; SELF-TRAPPED EXCITON; TIN OXIDE; THIN-FILMS; SURFACE; LUMINESCENCE; BEHAVIOR; GROWTH; PHOTOLUMINESCENCE; AMORPHIZATION; ZIRCONIA;
D O I
10.1016/j.nimb.2017.05.037
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
A crystalline-to-crystalline phase transformation, including chemical decomposition, has been observed in SnO2 nanopowder irradiated by 2.2 GeV Au-197 ions. X-ray diffraction (XRD), Raman spectroscopy, and transmission electron microscopy (TEM) were used to characterize the transformation from tetragonal SnO2 (P4(2)/mnm) to tetragonal SnO (P4/nmm), with trace quantities of beta-Sn (14(1)/amd). At a fluence of approximately 2.0 x 10(12) ions/cm(2), diffraction maxima corresponding to SnO became clearly evident and increased in intensity as fluence increased. The proportion of SnO, as determined by Rietveld refinement of XRD data, reached 23.1 +/- 0.8% at the maximum fluence investigated of 2.4 x 10(13) ions/cm(2). Raman spectra show high photoluminescence (PL) intensity before and during initial SnO formation, indicating the importance of oxygen vacancies in the transformation process. Small-angle X-ray scattering (SAXS) analysis provided evidence of ion tracks, but no tracks were observed using high-resolution TEM (HRTEM). The transformation likely occurs through a multiple-impact mechanism, based on the accumulation of O vacancies, defect ordering, and partially localized Sn reduction. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码:10 / 19
页数:10
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