skip to main content

DOE PAGESDOE PAGES

This content will become publicly available on November 15, 2017

Title: The effect of heat treatment on structural and electronic properties of niobium nitride prepared by a thermal diffusion method

NbN coatings are prepared onto Nb substrate by thermal diffusion at high temperatures. The formation of NbN coating by thermal diffusion was studied in the range of 1250-1500 °C at constant nitrogen background gas pressure (1.3x10-3 Pa) and processing time (180 min). The electronic and crystal structures of the NbN coatings were investigated. It was found that nitrogen diffuses into Nb forming the Nb-N solid solution (bcc) a-NbN phase that starts to appear above 1250 °C. Increasing the processing temperature gives richer a-phase concentration. Besides, X-ray absorption spectroscopy (XAS) was performed to study the electronic structure of the NbN layer. The results of the electronic structural study corroborate the crystal structural analysis. The Nb M3,2 edge X-ray absorption spectroscopy (XAS) spectrum shows strong temperature dependence. At the highest processing temperature (1500 °C), the number of d holes increased. Nitrogen diffusion into Nb is resulting to increase electrostatic interaction between d electron and core hole. Lastly, for the studied conditions, only the α-NbN was observed in the X-ray diffraction patterns.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5]
  1. Old Dominion Univ., Norfolk, VA (United States); Ain Shams Univ., Cairo (Egypt)
  2. Mersin Univ., Tarsus (Turkey)
  3. Old Dominion Univ., Norfolk, VA (United States)
  4. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  5. Cukurova Univ., Adana (Turkey)
Publication Date:
OSTI Identifier:
1332682
Report Number(s):
JLAB-ACC--16-2338; DOE/OR/23177--3943
Journal ID: ISSN 0257-8972; PII: S0257897216311768
Grant/Contract Number:
AC05-06OR23177
Type:
Accepted Manuscript
Journal Name:
Surface and Coatings Technology
Additional Journal Information:
Journal Volume: 309; Journal Issue: C; Journal ID: ISSN 0257-8972
Publisher:
Elsevier
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE NbNx; nitride; surface morphology; XRD; thermal diffusion; XAS