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Title: Irradiation-induced amorphization and order-disorder transformation in the tungsten delta-phase oxides Yb6W1O12 and Y6W1O12

Abstract

Polycrystalline Yb{sub 6}W{sub 1}O{sub 12} and Y{sub 6}W{sub 1}O{sub 12} samples, which possess rhombohedral symmetry (structure known as the {delta}-phase, closely related to cubic fluorite structure), were irradiated with 280 keV Kr{sup ++} ions to fluences up to 2 x 10{sup 20} ions/m{sup 2} at cryogenic temperature (100 K). Ion irradiation damage effects in these samples were examined using grazing incidence X-ray diffraction (GIXRD) and cross-sectional transmission electron microscopy (TEM). Irradiation-induced amorphization in both compounds has been observed by GIXRD and TEM, while the amorphization dose for Yb{sub 6}W{sub 1}O{sub 12} is lower than that for Yb{sub 6}W{sub 1}O{sub 12}. Experimental results also revealed that both irradiated samples experience an ordered rhombohedral to disordered cubic fluorite (O-D) transformation before amorphization. Factors influencing the irradiation damage response of these two compounds will be discussed in terms of cation radius ratio and cation antisite formation energy calculated by density functional theory (DFT).

Authors:
 [1];  [1];  [1];  [1]
  1. Los Alamos National Laboratory
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
962247
Report Number(s):
LA-UR-08-05245; LA-UR-08-5245
TRN: US0903408
DOE Contract Number:  
AC52-06NA25396
Resource Type:
Conference
Resource Relation:
Conference: 20th International Conference on the Application of Accelerators in Research ; August 10, 2008 ; Fort Worth, TX
Country of Publication:
United States
Language:
English
Subject:
36; ACCELERATORS; CATIONS; CRYOGENICS; FLUORITE; FUNCTIONALS; IRRADIATION; ORDER-DISORDER TRANSFORMATIONS; OXIDES; SYMMETRY; TRANSFORMATIONS; TRANSMISSION ELECTRON MICROSCOPY; TUNGSTEN; X-RAY DIFFRACTION

Citation Formats

Tang, Ming, Uberuaga, Blas, Valdez, James, and Sickafus, Kurt. Irradiation-induced amorphization and order-disorder transformation in the tungsten delta-phase oxides Yb6W1O12 and Y6W1O12. United States: N. p., 2008. Web.
Tang, Ming, Uberuaga, Blas, Valdez, James, & Sickafus, Kurt. Irradiation-induced amorphization and order-disorder transformation in the tungsten delta-phase oxides Yb6W1O12 and Y6W1O12. United States.
Tang, Ming, Uberuaga, Blas, Valdez, James, and Sickafus, Kurt. Tue . "Irradiation-induced amorphization and order-disorder transformation in the tungsten delta-phase oxides Yb6W1O12 and Y6W1O12". United States. https://www.osti.gov/servlets/purl/962247.
@article{osti_962247,
title = {Irradiation-induced amorphization and order-disorder transformation in the tungsten delta-phase oxides Yb6W1O12 and Y6W1O12},
author = {Tang, Ming and Uberuaga, Blas and Valdez, James and Sickafus, Kurt},
abstractNote = {Polycrystalline Yb{sub 6}W{sub 1}O{sub 12} and Y{sub 6}W{sub 1}O{sub 12} samples, which possess rhombohedral symmetry (structure known as the {delta}-phase, closely related to cubic fluorite structure), were irradiated with 280 keV Kr{sup ++} ions to fluences up to 2 x 10{sup 20} ions/m{sup 2} at cryogenic temperature (100 K). Ion irradiation damage effects in these samples were examined using grazing incidence X-ray diffraction (GIXRD) and cross-sectional transmission electron microscopy (TEM). Irradiation-induced amorphization in both compounds has been observed by GIXRD and TEM, while the amorphization dose for Yb{sub 6}W{sub 1}O{sub 12} is lower than that for Yb{sub 6}W{sub 1}O{sub 12}. Experimental results also revealed that both irradiated samples experience an ordered rhombohedral to disordered cubic fluorite (O-D) transformation before amorphization. Factors influencing the irradiation damage response of these two compounds will be discussed in terms of cation radius ratio and cation antisite formation energy calculated by density functional theory (DFT).},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2008},
month = {1}
}

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