Uncertainty budget for determinations of mean isomer shift from Mössbauer spectra

Jeppe Fock, Lara Katrina Bogart, Oliver Posth, Mikkel Fougt Hansen, Quentin A. Pankhurst, Cathrine Frandsen

Research output: Contribution to journalConference articleResearchpeer-review

Abstract

The magnetite/maghemite content within iron oxide nanoparticles can be determined using the mean isomer shift (δ¯¯). However, accurate characterisation of the composition is limited by the uncertainty associated with δ¯¯. We have identified four independent sources of uncertainty and developed a quantitative expression for the uncertainty budget. Sources of uncertainty are categorised as follows: that from the fitting of the Mössbauer spectrum (σ fit), that of the calibration of the α-Fe reference spectrum (σ cal), thermal corrections to the spectrum due to second order Doppler shift (SODS) (σ Δδ ) and other experimental errors (σ err). Each contribution is discussed in detail using 57Fe Mössbauer spectra obtained from an iron oxide nanoparticle system at temperatures between 16 K and 295 K on different spectrometers in two different laboratories.
Original languageEnglish
JournalHyperfine Interactions
Volume237
Issue number1
Pages (from-to)23
Number of pages11
ISSN0304-3843
DOIs
Publication statusPublished - 2016
EventThe International Conference on the Applications of the Mössbauer Effect - Hamburg, Germany
Duration: 13 Sep 201518 Sep 2015

Conference

ConferenceThe International Conference on the Applications of the Mössbauer Effect
CountryGermany
CityHamburg
Period13/09/201518/09/2015

Bibliographical note

This article is part of the Topical Collection on Proceedings of the International Conference on the Applications of the Mössbauer Effect (ICAME 2015), Hamburg, Germany, 13–18 September 2015

Keywords

  • 57Fe Mössbauer
  • Isomer shift
  • Second order Doppler shift
  • Uncertainty budget

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