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Reece, J. J., Redfern, S. A. T., Welch, M. D., Henderson, C. M. B. (2000) Mn-Mg disordering in cummingtonite: a high-temperature neutron powder diffraction study. Mineralogical Magazine, 64 (2) 255-266 doi:10.1180/002646100549166

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Reference TypeJournal (article/letter/editorial)
TitleMn-Mg disordering in cummingtonite: a high-temperature neutron powder diffraction study
JournalMineralogical Magazine
AuthorsReece, J. J.Author
Redfern, S. A. T.Author
Welch, M. D.Author
Henderson, C. M. B.Author
Year2000 (April)Volume64
Issue2
PublisherMineralogical Society
DOIdoi:10.1180/002646100549166Search in ResearchGate
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Mindat Ref. ID243148Long-form Identifiermindat:1:5:243148:6
GUID0
Full ReferenceReece, J. J., Redfern, S. A. T., Welch, M. D., Henderson, C. M. B. (2000) Mn-Mg disordering in cummingtonite: a high-temperature neutron powder diffraction study. Mineralogical Magazine, 64 (2) 255-266 doi:10.1180/002646100549166
Plain TextReece, J. J., Redfern, S. A. T., Welch, M. D., Henderson, C. M. B. (2000) Mn-Mg disordering in cummingtonite: a high-temperature neutron powder diffraction study. Mineralogical Magazine, 64 (2) 255-266 doi:10.1180/002646100549166
Abstract/NotesAbstractThe crystal structure of a manganoan cummingtonite, composition [M4](Na0.13Ca0.41Mg0.46Mn1.00) [M1,2,3](Mg4.87Mn0.13)(Si8O22)(OH)2, (Z = 2), a = 9.5539(2) Å, b = 18.0293(3) Å, c = 5.2999(1) Å, β = 102.614(2)° from Talcville, New York, has been refined at high temperature using in situ neutron powder diffraction. The P21/m to C2/m phase transition, observed as spontaneous strains +ε1 = −ε2, occurs at ˜107°C. Long-range disordering between Mg2+ and Mn2+ on the M(4) and M(2) sites occurs above 550°C. Mn2+ occupies the M(4) and M(2) sites preferring M(4) with a site-preference energy of 24.6±1.5 kJ mol−1. Disordering induces an increase in XMnM2 and decrease in XMnM4 at elevated temperatures. Upon cooling, the ordered states of cation occupancy are ‘frozen in’ and strains in lattice parameters are maintained, suggesting that re-equilibration during cooling has not taken place.

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Cummingtonite

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Welch, M. D., Reece, J. J., Redfern, S. A. T. (2008) Rapid intracrystalline exchange of octahedrally-coordinated divalent cations in amphiboles: an in situ high-temperature neutron diffraction study of synthetic potassic richterite AKB(NaCa)C(Mg2.5Ni2.5)Si8O22(OH)2. Mineralogical Magazine, 72 (4) 877-886 doi:10.1180/minmag.2008.072.4.877
Redfern, S. A. T., Knight, K. S., Henderson, C. M. B., Wood, B. J. (1998) Fe-Mn cation ordering in fayalite–tephroite (FexMn1−x)2SiO4 olivines: a neutron diffraction study. Mineralogical Magazine, 62 (5) 607-615 doi:10.1180/002646198548007
Warren, M. C., Dove, M. T., Redfern, S. A. T. (2000) Disordering of MgAl2O4 spinel from first principles. Mineralogical Magazine, 64 (2) 311-317 doi:10.1180/002646100549210
Henderson, C. M. B., Knight, K. S., Redfern, S. A. T., Wood, B. J. (1996) High-Temperature Study of Octahedral Cation Exchange in Olivine by Neutron Powder Diffraction. Science, 271 (5256). 1713-1715 doi:10.1126/science.271.5256.1713
Redfern, S. A. T., Henderson, C. M. B., Knight, K. S., Wood, B. J. (1996) High-temperatureM-site disordering in Mn-olivines byin situneutron diffraction. Acta Crystallographica Section A Foundations of Crystallography, 52. doi:10.1107/s0108767396086035
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Bell, A. M. T., Henderson, C. M. B. (2012) High-temperature synchrotron X-ray powder diffraction study of Cs2XSi5O12(X = Cd, Cu, Zn) leucites. Mineralogical Magazine, 76 (5) 1257-1280 doi:10.1180/minmag.2012.076.5.12
Reece, J. J., Redfern, S. A. T. (2004) Influence of metal cation order on magnetic order in manganogrunerite, (Fe,Mg,Mn)7Si8O22(OH)2, a quasi-one-dimensional chain antiferromagnet. Mineralogical Magazine, 68 (6) 853-858 doi:10.1180/0026461046860227
Palin, E. J., Dove, M. T., Welch, M. D., Redfern, S. A. T. (2005) Computational investigation of Al/Si and Al/Mg ordering in aluminous tremolite amphiboles. Mineralogical Magazine, 69 (1) 1-20 doi:10.1180/0026461056910232
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Redfern, S. A. T., Artioli, G., Rinaldi, R., Henderson, C. M. B., Knight, K. S., Wood, B. J. (2000) Octahedral cation ordering in olivine at high temperature. II: an in situ neutron powder diffraction study on synthetic MgFeSiO 4 (Fa50) Physics and Chemistry of Minerals, 27 (9) 630-637 doi:10.1007/s002690000109
 
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