MN-MG DISORDERING IN CUMMINGTONITE: A HIGH-TEMPERATURE NEUTRON POWDER DIFFRACTION STUDY

dc.contributor.author	Reece J.J.
dc.contributor.author	Redfern S.A.T.
dc.contributor.author	Welch M.D.
dc.contributor.author	Henderson C.M.B.
dc.date.accessioned	2021-01-31T12:47:14Z
dc.date.available	2021-01-31T12:47:14Z
dc.date.issued	2000
dc.identifier	https://elibrary.ru/item.asp?id=14248605
dc.identifier.citation	Mineralogical Magazine, 2000, 64, 2, 255-266
dc.identifier.issn	0026-461X
dc.identifier.uri	https://repository.geologyscience.ru/handle/123456789/24117
dc.description.abstract	The crystal structure of a manganoan cummingtonite, composition ([M4])(Na0.13Ca0.41Mg0.46Mn1.00) 102,614(2)(n) from Talcville, New York, has been refined at high temperature using in situ neutron powder diffraction. The P2(1)/m to C2/m phase transition, observed as spontaneous strains +epsilon(1) = -epsilon(2), occurs at similar to 107 degrees C. Long-range: disordering between Mg2+ and Mn2+! on the M(4) and M(2) sites occurs above 550 degrees C. Mn2+ occupies the M(4) and M(2) sites preferring M(4) with a site-preference energy of 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.
dc.title	MN-MG DISORDERING IN CUMMINGTONITE: A HIGH-TEMPERATURE NEUTRON POWDER DIFFRACTION STUDY
dc.type	Статья

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