Nitrogen vacancy complexes in nitrogen irradiated metals

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Gas desorption and positron annihilation techniques have been employed to study the evolution of nitrogen associated defects in nitrogen irradiated metals: Fe, Ni, Mo and W. Nitrogen in these metals has a rather high affinity to vacancy type defects. The results obtained for low irradiation dose show that substitutional nitrogen (NV; with V = vacancy) is formed. The nitrogen vacancy complex dissociates at temperatures ranging from 350 K for Ni to 900 K for Mo and 1,100 K for W. At high doses defects are formed which can be characterized as nitrogen saturated vacancy clusters. These defect, as observed by ... continued below

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7 p.

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Veen, A. van; Westerduin, K.T.; Schut, H.; Melker, E.J.E.; Thijsse, B.J.; Nielsen, B. et al. December 31, 1996.

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Description

Gas desorption and positron annihilation techniques have been employed to study the evolution of nitrogen associated defects in nitrogen irradiated metals: Fe, Ni, Mo and W. Nitrogen in these metals has a rather high affinity to vacancy type defects. The results obtained for low irradiation dose show that substitutional nitrogen (NV; with V = vacancy) is formed. The nitrogen vacancy complex dissociates at temperatures ranging from 350 K for Ni to 900 K for Mo and 1,100 K for W. At high doses defects are formed which can be characterized as nitrogen saturated vacancy clusters. These defect, as observed by helium probing, disappear during annealing for nickel at 800 K, and for Mo at 1,100 K. The direct observation of the desorbing nitrogen for nickel and molybdenum reveals a very fast desorption transient at the dissociation temperature of the clusters. This is the characteristic desorption transient of a small nitride cluster, e.g., by shrinkage with constant rate. For iron the nitrogen desorption is more complicated because of a general background that continuously rises with temperature. With the positron beam technique depth information was obtained for defects in iron and the defect character could be established with the help of the information provided on annihilation with conduction and core electrons of the defect trapped positrons.

Physical Description

7 p.

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INIS; OSTI as DE97002914

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  • 1996 Fall meeting of the Materials Research Society (MRS), Boston, MA (United States), 2-6 Dec 1996

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  • Other: DE97002914
  • Report No.: BNL--63740
  • Report No.: CONF-961202--44
  • Grant Number: AC02-76CH00016
  • DOI: 10.2172/432981 | External Link
  • Office of Scientific & Technical Information Report Number: 432981
  • Archival Resource Key: ark:/67531/metadc674237

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • December 31, 1996

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  • July 25, 2015, 2:20 a.m.

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  • Nov. 9, 2015, 8:13 p.m.

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Veen, A. van; Westerduin, K.T.; Schut, H.; Melker, E.J.E.; Thijsse, B.J.; Nielsen, B. et al. Nitrogen vacancy complexes in nitrogen irradiated metals, report, December 31, 1996; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc674237/: accessed October 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.