Transmission electron microscopy study of an electron-beam-induced phase transformation of niobium nitride

SCRIPTA MATERIALIA

卷:60

Article

Won, Jonghan¹  Valdez, James A.¹  Naito, Muneyuki²  Ishimaru, Manabu²  Sickafus, Kurt E.¹ 

[1] Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA

[2] Osaka Univ, Inst Sci & Ind Res, Osaka 5670047, Japan

关键词: Niobium nitride;    Phase transformation;    Electron irradiation;    Transmission electron microscopy;    Order-disorder;   

DOI  :  10.1016/j.scriptamat.2009.01.023

来源: Elsevier

【 摘 要 】

Tetragonal gamma-NbN(1-x) was irradiated with 300 keV electrons at room temperature to fluences from 1.8 x 10(24)-5.4 x 10(26) e/m(2). The superlattice structure in gamma-NbN(1-x) was observed using transmission electron microscopy and found to disappear at a fluence of 5.4 x 10(26) e/m(2). During this process, displaced nitrogen atoms occupy vacant sites on the nitrogen sublattice. The final structure is a delta-phase (B1) structure. A randomized arrangement of N vacancies is responsible for the observed gamma -> delta transformation. Published by Elsevier Ltd. on behalf of Acta Materialia Inc.

【 授权许可】

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