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Title: Nitrogen vacancy complexes in nitrogen irradiated metals

Abstract

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 themore » information provided on annihilation with conduction and core electrons of the defect trapped positrons.« less

Authors:
; ; ; ;  [1]; ; ; ;  [2]
  1. Delft Univ. of Technology (Netherlands)
  2. Brookhaven National Lab., Upton, NY (United States)
Publication Date:
Research Org.:
Brookhaven National Lab., Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Energy Research, Washington, DC (United States)
OSTI Identifier:
432981
Report Number(s):
BNL-63740; CONF-961202-44
ON: DE97002914; TRN: 97:004419
DOE Contract Number:  
AC02-76CH00016
Resource Type:
Technical Report
Resource Relation:
Conference: 1996 Fall meeting of the Materials Research Society (MRS), Boston, MA (United States), 2-6 Dec 1996; Other Information: PBD: [1996]
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; IRON; NICKEL; MOLYBDENUM; TUNGSTEN; ION IMPLANTATION; PHYSICAL RADIATION EFFECTS; VACANCIES; DESORPTION; ANNEALING; EXPERIMENTAL DATA

Citation Formats

Veen, A van, Westerduin, K T, Schut, H, Melker, E J.E., Thijsse, B J, Nielsen, B, Asoka Kumar, P, Ghosh, V J, and Lynn, K G. Nitrogen vacancy complexes in nitrogen irradiated metals. United States: N. p., 1996. Web. doi:10.2172/432981.
Veen, A van, Westerduin, K T, Schut, H, Melker, E J.E., Thijsse, B J, Nielsen, B, Asoka Kumar, P, Ghosh, V J, & Lynn, K G. Nitrogen vacancy complexes in nitrogen irradiated metals. United States. doi:10.2172/432981.
Veen, A van, Westerduin, K T, Schut, H, Melker, E J.E., Thijsse, B J, Nielsen, B, Asoka Kumar, P, Ghosh, V J, and Lynn, K G. Tue . "Nitrogen vacancy complexes in nitrogen irradiated metals". United States. doi:10.2172/432981. https://www.osti.gov/servlets/purl/432981.
@article{osti_432981,
title = {Nitrogen vacancy complexes in nitrogen irradiated metals},
author = {Veen, A van and Westerduin, K T and Schut, H and Melker, E J.E. and Thijsse, B J and Nielsen, B and Asoka Kumar, P and Ghosh, V J and Lynn, K G},
abstractNote = {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.},
doi = {10.2172/432981},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1996},
month = {12}
}