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quadrupole splitting distributions

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Journal Article

Octahedral cation distribution in glauconites from Southern Urals by combination of crystal-chemical model and quasi-continuous model-independent quadrupole splitting distributions (QSD) fitted to their Mössbauer spectra Available to Purchase

Lidia G. Dainyak, Viacheslav S. Rusakov, Ivan A. Sukhorukov, Victor A. Drits
Published: 01 September 2013
European Journal of Mineralogy (2013) 25 (3): 405–414.
DOI: https://doi.org/10.1127/0935-1221/2013/0025-2275
...Lidia G. Dainyak; Viacheslav S. Rusakov; Ivan A. Sukhorukov; Victor A. Drits Abstract Mössbauer spectra of two glauconites, BSH-11 and KUL-1, from the Southern Urals are interpreted by simulation using crystal-chemical modelling and by fitting of quadrupole splitting distribution (QSD). The crystal...
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View PDF for article title, Octahedral cation <span class="search-highlight">distribution</span> in glauconites from Southern Urals by combination of crystal-chemical model and quasi-continuous model-independent <span class="search-highlight">quadrupole</span> <span class="search-highlight">splitting</span> <span class="search-highlight">distributions</span> (QSD) fitted to their Mössbauer spectra
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Journal Article

Quadrupole splitting distributions in triclinic astrophyllite Available to Purchase

Zhe LI, Zhesheng MA, Ming XIONG, Nicheng SHI, Danian YE, Alexandr KHOMYAKOV
Published: 01 July 2003
European Journal of Mineralogy (2003) 15 (4): 707–710.
DOI: https://doi.org/10.1127/0935-1221/2003/0015-0707
...-70176 Stuttgart 2003 Mössbauer effect, quadrupole splitting distributions, astrophyllite. Astrophyllite, mica-like titanium silicate, is known to have several polymorphic modifications with different symmetries and compositions. Triclinic astrophyllite, K 2 Na(-Fe, Mn, Mg) 7 [Ti 2 (Si 4 O...
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View PDF for article title, <span class="search-highlight">Quadrupole</span> <span class="search-highlight">splitting</span> <span class="search-highlight">distributions</span> in triclinic astrophyllite
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Journal Article

Octahedral site Fe (super 2+) quadrupole splitting distributions from the Moessbauer spectra of arrojadite Available to Purchase

Isamu Shinno, Li Zhe
Published: 01 December 1998
American Mineralogist (1998) 83 (11-12_Part_1): 1316–1322.
DOI: https://doi.org/10.2138/am-1998-11-1220
...Isamu Shinno; Li Zhe Abstract The Mossbauer spectra of arrojadite, (K,Ba)(Na,Ca) 5 (Fe (super 2+) , Mn, Mg) 14 Al(PO 4 ) 12 (OH,F), at 298 and 95 K were investigated for the first time. The spectra at both temperatures were analyzed in terms of their Fe (super 2+) quadrupole splitting distributions...
View PDF for article title, Octahedral site Fe (super 2+) <span class="search-highlight">quadrupole</span> <span class="search-highlight">splitting</span> <span class="search-highlight">distributions</span> from the Moessbauer spectra of arrojadite
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Journal Article

A Moessbauer study of natural gahnite spinels showing strongly temperature-dependent quadrupole splitting distributions Available to Purchase

J. C. Waerenborgh, H. Annersten, T. Ericsson, M. O. Figueiredo, J. M. P. Cabral
Published: 01 January 1990
European Journal of Mineralogy (1990) 2 (3): 267–271.
View PDF for article title, A Moessbauer study of natural gahnite spinels showing strongly temperature-dependent <span class="search-highlight">quadrupole</span> <span class="search-highlight">splitting</span> <span class="search-highlight">distributions</span>
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Image
Experimental quadrupole splitting distributions from Rancourt et al. (1994) of natural annite (dashed line) and natural phlogopite (dotted line) plotted against the left-hand axis, compared with theoretical flattening curves for FeO610− (solid squares), Fe(OH)64− (solid circles) and 7-oct. clusters (solid triangles) taken from Figure 3, and average quadrupole splittings vs. average flattening angles for several biotite samples from Shabani (1999) (open squares), plotted against the right-hand axis.

Experimental quadrupole splitting distributions from Rancourt et al. (1994... Available to Purchase

Published: 01 January 2005
F igure 13. Experimental quadrupole splitting distributions from Rancourt et al. (1994) of natural annite (dashed line) and natural phlogopite (dotted line) plotted against the left-hand axis, compared with theoretical flattening curves for FeO 6 10− (solid squares), Fe(OH) 6 4− (solid
Image
Representative quadrupole splitting distributions for the Fe3+ generalized site.

Representative quadrupole splitting distributions for the Fe 3+ generalize... Available to Purchase

Published: 01 November 2004
Fig. 3. Representative quadrupole splitting distributions for the Fe 3+ generalized site.
Image
End-member quadrupole splitting distributions for the Fe2+ generalized site. A general trend in QSDs is observed from broad distributions (WQSD: 0.912 mm/s) with small 〈QS〉 (2.202 mm/s) and QSpeak (2.305 mm/s) values, shown as dashed lines, to narrow distributions (WQSD: 0.563 mm/s) with large 〈QS〉 (2.416 mm/s) and QSpeak (2.510 mm/s) values, shown as solid lines. Discussion regarding the effect of Zr on the distributions will take place in latter sections. Fig. 4B.End-member RT, thin-limit, thickness-corrected Mössbauer spectra associated with quadrupole splitting distributions as observed in Fig. 4A. Note the variation in the full-width half-maximum (FWHM) of the high-energy absorption peak between MSH15 (FWHM 0.54 mm/s) with broad F2+ distributions, and US5 (FWHM 0.42 mm/s) with narrow Fe2+ distributions.

End-member quadrupole splitting distributions for the Fe 2+ generalized si... Available to Purchase

Published: 01 November 2004
Fig. 4A. End-member quadrupole splitting distributions for the Fe 2+ generalized site. A general trend in QSDs is observed from broad distributions (W QSD : 0.912 mm/s) with small 〈QS〉 (2.202 mm/s) and QS peak (2.305 mm/s) values, shown as dashed lines, to narrow distributions (W QSD : 0.563 mm
Image
End-member quadrupole splitting distributions for the Fe2+ generalized site. A general trend in QSDs is observed from broad distributions (WQSD: 0.912 mm/s) with small 〈QS〉 (2.202 mm/s) and QSpeak (2.305 mm/s) values, shown as dashed lines, to narrow distributions (WQSD: 0.563 mm/s) with large 〈QS〉 (2.416 mm/s) and QSpeak (2.510 mm/s) values, shown as solid lines. Discussion regarding the effect of Zr on the distributions will take place in latter sections. Fig. 4B.End-member RT, thin-limit, thickness-corrected Mössbauer spectra associated with quadrupole splitting distributions as observed in Fig. 4A. Note the variation in the full-width half-maximum (FWHM) of the high-energy absorption peak between MSH15 (FWHM 0.54 mm/s) with broad F2+ distributions, and US5 (FWHM 0.42 mm/s) with narrow Fe2+ distributions.

End-member quadrupole splitting distributions for the Fe 2+ generalized si... Available to Purchase

Published: 01 November 2004
Fig. 4A. End-member quadrupole splitting distributions for the Fe 2+ generalized site. A general trend in QSDs is observed from broad distributions (W QSD : 0.912 mm/s) with small 〈QS〉 (2.202 mm/s) and QS peak (2.305 mm/s) values, shown as dashed lines, to narrow distributions (W QSD : 0.563 mm
Image
End-member quadrupole splitting distributions for the Fe2+ generalized site. A general trend in QSDs is observed from broad distributions (WQSD: 0.912 mm/s) with small 〈QS〉 (2.202 mm/s) and QSpeak (2.305 mm/s) values, shown as dashed lines, to narrow distributions (WQSD: 0.563 mm/s) with large 〈QS〉 (2.416 mm/s) and QSpeak (2.510 mm/s) values, shown as solid lines. Discussion regarding the effect of Zr on the distributions will take place in latter sections. Fig. 4B.End-member RT, thin-limit, thickness-corrected Mössbauer spectra associated with quadrupole splitting distributions as observed in Fig. 4A. Note the variation in the full-width half-maximum (FWHM) of the high-energy absorption peak between MSH15 (FWHM 0.54 mm/s) with broad F2+ distributions, and US5 (FWHM 0.42 mm/s) with narrow Fe2+ distributions.

End-member quadrupole splitting distributions for the Fe 2+ generalized si... Available to Purchase

Published: 01 November 2004
Fig. 4A. End-member quadrupole splitting distributions for the Fe 2+ generalized site. A general trend in QSDs is observed from broad distributions (W QSD : 0.912 mm/s) with small 〈QS〉 (2.202 mm/s) and QS peak (2.305 mm/s) values, shown as dashed lines, to narrow distributions (W QSD : 0.563 mm
Image
Quadrupole splitting distributions for the Fe site in sample HO20, according to models a, d, and e.

Quadrupole splitting distributions for the Fe site in sample HO20, accordin... Available to Purchase

Published: 01 April 2003
F igure 5. Quadrupole splitting distributions for the Fe site in sample HO20, according to models a, d, and e.
Image
Profile of Voigt-based quadrupole-splitting distribution (QSD) for Fe2+.

Profile of Voigt-based quadrupole-splitting distribution (QSD) for Fe 2+ . Available to Purchase

Published: 01 August 2009
F ig . 1b. Profile of Voigt-based quadrupole-splitting distribution (QSD) for Fe 2+ .
Image

Quadrupole splitting distribution parameters for Zr-deficient and Zr-rich a... Available to Purchase

Published: 01 November 2004
Table 5. Quadrupole splitting distribution parameters for Zr-deficient and Zr-rich astrophyllite-group minerals.
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Quadrupole splitting distribution (QSD) fits to 4 K Mössbauer spectra for samples 38 and 56.

Quadrupole splitting distribution (QSD) fits to 4 K Mössbauer spectra for ... Available to Purchase

Published: 01 June 2010
F ig . 6. Quadrupole splitting distribution (QSD) fits to 4 K Mössbauer spectra for samples 38 and 56.
Image
Representative Mössbauer spectra and quadrupole splitting distribution (QSD) fits (solid lines) for Fe in diopside. Isomer shifts are reported relative to metallic Fe. Each spectrum was fit with two Fe2+ components (with δ about 1.1 to 1.2) and up to two Fe3+ components (with δ about 0.3 to 0.4).

Representative Mössbauer spectra and quadrupole splitting distribution (QS... Available to Purchase

Published: 01 July 2002
F igure 6. Representative Mössbauer spectra and quadrupole splitting distribution (QSD) fits (solid lines) for Fe in diopside. Isomer shifts are reported relative to metallic Fe. Each spectrum was fit with two Fe 2+ components (with δ about 1.1 to 1.2) and up to two Fe 3+ components (with δ
Journal Article

The relationships between crystal-chemical and hyperfine parameters in members of the astrophyllite-group : A combined 57 Fe Mössbauer spectroscopy and single-crystal X-ray diffraction study Available to Purchase

Paula C. PIILONEN, Denis G. RANCOURT, R. James EVANS, André E. LALONDE, Andrew M. McDONALD, Amir A.T. SHABANI
Published: 01 November 2004
European Journal of Mineralogy (2004) 16 (6): 989–1002.
DOI: https://doi.org/10.1127/0935-1221/2004/0016-0989
...Fig. 3. Representative quadrupole splitting distributions for the Fe 3+ generalized site. ...
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View PDF for article title, The relationships between crystal-chemical and hyperfine parameters in members of the astrophyllite-group : A combined 57 Fe Mössbauer spectroscopy and single-crystal X-ray diffraction study
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An improved model for the interpretation of Mössbauer spectra of dioctahedral 2:1 trans -vacant Fe-rich micas: refinement of parameters Available to Purchase

Lidia G. Dainyak, Viacheslav S. Rusakov, Ivan A. Sukhorukov, Bella B. Zviagina, Victor A. Drits
Published: 01 October 2009
European Journal of Mineralogy (2009) 21 (5): 995–1008.
DOI: https://doi.org/10.1127/0935-1221/2009/0021-1954
... Mössbauer spectra were analyzed with quasi-continuous model-independent quadrupole splitting distributions (QSDs). The obtained QSDs were interpreted using a crystal-chemical model taking account of the effects of the local structural and chemical heterogeneity of layer silicates. The main parameters...
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View PDF for article title, An improved model for the interpretation of Mössbauer spectra of dioctahedral 2:1 trans -vacant Fe-rich micas: refinement of parameters
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Journal Article

Hyperfine electric field gradient tensors at Fe 2+ sites in octahedral layers: Toward understanding oriented single-crystal Mössbauer spectroscopy measurements of micas Available to Purchase

R. James Evans, Denis G. Rancourt, Michael Grodzicki
Published: 01 October 2005
American Mineralogist (2005) 90 (10): 1540–1555.
DOI: https://doi.org/10.2138/am.2005.1673
... EFG tensor results from all clusters, and using probabilities for the occurrence of each possible cation configuration in a chemically disordered octahedral sheet of a given bulk composition, we simulate averages and distributions of η, principal axis angles, and quadrupole splittings. While the value...
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View PDF for article title, Hyperfine electric field gradient tensors at Fe 2+ sites in octahedral layers: Toward understanding oriented single-crystal Mössbauer spectroscopy measurements of micas
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Journal Article

The turquoise-chalcosiderite Cu(Al,Fe 3+ ) 6 (PO 4 ) 4 (OH) 8 ·4H 2 O solid-solution series: A Mössbauer spectroscopy, XRD, EMPA, and FTIR study Available to Purchase

Yassir A. Abdu, Sharon K. Hull, Mostafa Fayek, Frank C. Hawthorne
Published: 01 October 2011
American Mineralogist (2011) 96 (10): 1433–1442.
DOI: https://doi.org/10.2138/am.2011.3658
... Fe 3+ sites, using a Voigt-based quadrupole-splitting distribution method, which are assigned to the M3 (smaller quadrupole splitting) on the one hand and M1 and M2 octahedral sites on the other hand. The Fe 3+ distribution over the M3 and M1,2 sites, calculated from the Mössbauer relative areas...
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View PDF for article title, The turquoise-chalcosiderite Cu(Al,Fe 3+ ) 6 (PO 4 ) 4 (OH) 8 ·4H 2 O solid-solution series: A Mössbauer spectroscopy, XRD, EMPA, and FTIR study
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Journal Article

Recrystallization in fully metamict gadolinite from Ytterby (Sweden), annealed in air and studied by 57 Fe Mössbauer spectroscopy Available to Purchase

Dariusz Malczewski
Published: 01 April 2010
American Mineralogist (2010) 95 (4): 463–471.
DOI: https://doi.org/10.2138/am.2010.3253
... broad peaks solely from Fe 2+ components in octahedral coordinations. The corresponding quadrupole splitting distribution (QSD) shows two distinct maxima at 1.59 and 2.16 mm/s, which reflect the post-metamictization distributions of Fe 2+ positions up to heating at 773 K. Changes in the Mössbauer...
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View PDF for article title, Recrystallization in fully metamict gadolinite from Ytterby (Sweden), annealed in air and studied by 57 Fe Mössbauer spectroscopy
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Mössbauer spectroscopy of phyllosilicates: effects of fitting models on recoil-free fractions and redox ratios Available to Purchase

M. D. DYAR, M. W. SCHAEFER, E. C. SKLUTE, J. L. BISHOP
Journal: Clay Minerals
Published: 01 March 2008
Clay Minerals (2008) 43 (1): 3–33.
DOI: https://doi.org/10.1180/claymin.2008.043.1.02
...) quadrupole-splitting distributions (QSD); and (4) a technique that does not assume a particular line shape (subsequently referred to as ‘model-independent’). Values of δ I , 𝛉 M and f were determined using the method of De Grave & Van Alboom (1991) . Results show that multiple doublets are routinely...
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View PDF for article title, Mössbauer spectroscopy of phyllosilicates: effects of fitting models on recoil-free fractions and redox ratios
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