Electron-irradiation induced defects in Yb2Ti2.05O7
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作者:
Mostaed, Ali
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Univ Sheffield, Dept Mat Sci & Engn, Sheffield S1 3JD, S Yorkshire, England
Univ Warwick, Dept Phys, Gibbet Hill Rd, Coventry CV4 7AL, W Midlands, EnglandUniv Sheffield, Dept Mat Sci & Engn, Sheffield S1 3JD, S Yorkshire, England
Mostaed, Ali
[1
,2
]
Balakrishnan, Geetha
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Univ Warwick, Dept Phys, Gibbet Hill Rd, Coventry CV4 7AL, W Midlands, EnglandUniv Sheffield, Dept Mat Sci & Engn, Sheffield S1 3JD, S Yorkshire, England
Balakrishnan, Geetha
[2
]
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Lees, Martin R.
[2
]
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Beanland, Richard
[2
]
机构:
[1] Univ Sheffield, Dept Mat Sci & Engn, Sheffield S1 3JD, S Yorkshire, England
[2] Univ Warwick, Dept Phys, Gibbet Hill Rd, Coventry CV4 7AL, W Midlands, England
We present a scanning transmission electron microscopy (STEM) analysis of electron irradiation-induced defects in Yb2Ti2O7, which form in material with a deliberate Ti excess. No defects were observed to form in stoichiometric or Yb-rich material. The defects in the Ti rich materials are regions of lower density, roughly 1.5 nm in thickness, lying along {111} or {110} planes. A minority of defects also contain extrinsic partial dislocation loops. We use geometric phase analysis of atomically-resolved annular-dark field STEM images combined with dislocation tensor analysis in a new program BurgersVectors to show that the Burgers vector of the partial dislocations are of 1/4 < 110 > type. Atomically-resolved energy dispersive X-ray analysis shows that, although some cation disorder is observed in the affected region, the material does not fully transition to a defect fluorite structure. It is proposed that these phenomena, and their absence in stoichiometric and Yb-rich material, can be explained by the presence of negatively charged Yb vacancies that are only present in material with a Ti excess. The injection of oxygen Frenkel pairs under energetic electron irradiation provides oxygen interstitials that can neutralize positively charged Ti atoms on the Yb sites, while the mobile oxygen vacancies combine with Yb vacancies and condense to form the observed low-density regions. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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Univ Paris Saclay, CEA, DEN, Serv Rech Met Appl, F-91191 Gif Sur Yvette, FranceUniv Paris Saclay, CEA, DEN, Serv Rech Met Appl, F-91191 Gif Sur Yvette, France
Costantini, Jean-Marc
Miro, Sandrine
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Univ Paris Saclay, CEA, DEN, Serv Rech Met Phys, F-91191 Gif Sur Yvette, FranceUniv Paris Saclay, CEA, DEN, Serv Rech Met Appl, F-91191 Gif Sur Yvette, France
Miro, Sandrine
Touati, Nadia
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PSL Res Univ, Chim Paris Tech, Inst Rech Chim Paris, 11 Rue Pierre & Marie Curie, F-75005 Paris, France
Sorbonne Univ, UPMC, 4 Pl Jussieu, F-75005 Paris, FranceUniv Paris Saclay, CEA, DEN, Serv Rech Met Appl, F-91191 Gif Sur Yvette, France
Touati, Nadia
Binet, Laurent
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PSL Res Univ, Chim Paris Tech, Inst Rech Chim Paris, 11 Rue Pierre & Marie Curie, F-75005 Paris, France
Sorbonne Univ, UPMC, 4 Pl Jussieu, F-75005 Paris, FranceUniv Paris Saclay, CEA, DEN, Serv Rech Met Appl, F-91191 Gif Sur Yvette, France
Binet, Laurent
Wallez, Gilles
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PSL Res Univ, Chim Paris Tech, Inst Rech Chim Paris, 11 Rue Pierre & Marie Curie, F-75005 Paris, France
Sorbonne Univ, UPMC, 4 Pl Jussieu, F-75005 Paris, FranceUniv Paris Saclay, CEA, DEN, Serv Rech Met Appl, F-91191 Gif Sur Yvette, France
Wallez, Gilles
Lelong, Gerald
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UPMC Univ Paris 06, Sorbonne Univ, Museum Natl Hist Nat, IMPMC,UMR CNRS 7590,IRD UMR 206, 4 Pl Jussieu, F-75005 Paris, FranceUniv Paris Saclay, CEA, DEN, Serv Rech Met Appl, F-91191 Gif Sur Yvette, France
Lelong, Gerald
Guillaumet, Maxime
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UPMC Univ Paris 06, Sorbonne Univ, Museum Natl Hist Nat, IMPMC,UMR CNRS 7590,IRD UMR 206, 4 Pl Jussieu, F-75005 Paris, FranceUniv Paris Saclay, CEA, DEN, Serv Rech Met Appl, F-91191 Gif Sur Yvette, France
机构:
Univ Calif Davis, Peter A Rock Thermochem Lab, Davis, CA 95616 USA
Univ Calif Davis, NEAT ORU, Davis, CA 95616 USA
Los Alamos Natl Lab, Earth & Environm Sci Div, Los Alamos, NM 87545 USAUniv Calif Davis, Peter A Rock Thermochem Lab, Davis, CA 95616 USA
Chung, Cheng-Kai
Lang, Maik
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Univ Tennessee, Dept Nucl Engn, Knoxville, TN 37996 USAUniv Calif Davis, Peter A Rock Thermochem Lab, Davis, CA 95616 USA
Lang, Maik
Xu, Hongwu
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Los Alamos Natl Lab, Earth & Environm Sci Div, Los Alamos, NM 87545 USAUniv Calif Davis, Peter A Rock Thermochem Lab, Davis, CA 95616 USA
Xu, Hongwu
Navrotsky, Alexandra
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Univ Calif Davis, Peter A Rock Thermochem Lab, Davis, CA 95616 USA
Univ Calif Davis, NEAT ORU, Davis, CA 95616 USAUniv Calif Davis, Peter A Rock Thermochem Lab, Davis, CA 95616 USA
机构:
Univ Michigan, Dept Geol Sci, Ann Arbor, MI 48109 USAUniv Michigan, Dept Geol Sci, Ann Arbor, MI 48109 USA
Wang, Jianwei
Zhang, Fuxiang
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Univ Michigan, Dept Geol Sci, Ann Arbor, MI 48109 USAUniv Michigan, Dept Geol Sci, Ann Arbor, MI 48109 USA
Zhang, Fuxiang
Lian, Jie
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Rensselaer Polytech Inst, Dept Mech Aerosp & Nucl Engn, Troy, NY 12180 USAUniv Michigan, Dept Geol Sci, Ann Arbor, MI 48109 USA
Lian, Jie
Ewing, Rodney C.
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Univ Michigan, Dept Geol Sci, Ann Arbor, MI 48109 USA
Univ Michigan, Dept Mat Sci & Engn, Ann Arbor, MI 48109 USAUniv Michigan, Dept Geol Sci, Ann Arbor, MI 48109 USA
Ewing, Rodney C.
Becker, Udo
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Univ Michigan, Dept Geol Sci, Ann Arbor, MI 48109 USAUniv Michigan, Dept Geol Sci, Ann Arbor, MI 48109 USA
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Lanzhou Univ, Sch Nucl Sci & Technol, Lanzhou 730000, Peoples R China
Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R ChinaLanzhou Univ, Sch Nucl Sci & Technol, Lanzhou 730000, Peoples R China
Li Yu-Hong
Xu Chun-Ping
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Lanzhou Univ, Sch Nucl Sci & Technol, Lanzhou 730000, Peoples R ChinaLanzhou Univ, Sch Nucl Sci & Technol, Lanzhou 730000, Peoples R China
Xu Chun-Ping
Gao Chao
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Lanzhou Univ, Sch Nucl Sci & Technol, Lanzhou 730000, Peoples R ChinaLanzhou Univ, Sch Nucl Sci & Technol, Lanzhou 730000, Peoples R China
Gao Chao
Wang Zhi-Guang
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Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R ChinaLanzhou Univ, Sch Nucl Sci & Technol, Lanzhou 730000, Peoples R China
机构:
Australian Nucl Sci & Technol Org, Inst Mat Engn, Lucas Heights, NSW 2234, AustraliaAustralian Nucl Sci & Technol Org, Inst Mat Engn, Lucas Heights, NSW 2234, Australia
Aughterson, Robert D.
Newman, Robin
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Intellectual Property Off, Concept House Cardiff Rd, Newport NP108QQ, Gwent, WalesAustralian Nucl Sci & Technol Org, Inst Mat Engn, Lucas Heights, NSW 2234, Australia
Newman, Robin
Ionescu, Mihail
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Australian Nucl Sci & Technol Org, Inst Mat Engn, Lucas Heights, NSW 2234, AustraliaAustralian Nucl Sci & Technol Org, Inst Mat Engn, Lucas Heights, NSW 2234, Australia
Ionescu, Mihail
Lumpkin, Gregory R.
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Australian Nucl Sci & Technol Org, Inst Mat Engn, Lucas Heights, NSW 2234, AustraliaAustralian Nucl Sci & Technol Org, Inst Mat Engn, Lucas Heights, NSW 2234, Australia
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Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USAUniv Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA
Xiao, H. Y.
Weber, W. J.
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Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA
Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USAUniv Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA