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A variable-temperature neutron diffraction study of serandite; a Mn-silicate framework with a very strong, two-proton site, hydrogen bond

Edward R. Williams and Mark T. Weller
A variable-temperature neutron diffraction study of serandite; a Mn-silicate framework with a very strong, two-proton site, hydrogen bond
American Mineralogist (August 2014) 99 (8-9): 1755-1760

Abstract

A variable-temperature powder neutron diffraction study of serandite, Na(Mn,Ca) (sub 2) Si (sub 3) O (sub 8) (OH), has been undertaken over the temperature range 4-800 K to investigate the behavior of the very strong hydrogen bond in this mineral. At 4 K the O(D)...O(A) distance in serandite has been determined to be extremely short at 2.413(10) Aa. The distribution of hydrogen along the O3...O4 direction at low temperatures confirms that reported previously at room temperature with one site, bonded to O3, strongly, but not exclusively, favored; the origin of the occupation of this preferred site has been assigned to additional weak hydrogen bonding interactions. At higher temperatures the hydrogen distribution along the O3...O4 direction becomes increasingly random as the thermal energy and motion outweigh the weak hydrogen bonding. The data also show that calcium substitutes only on one manganese site, Mn2 in the mineral structure.


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 99
Serial Issue: 8-9
Title: A variable-temperature neutron diffraction study of serandite; a Mn-silicate framework with a very strong, two-proton site, hydrogen bond
Affiliation: University of Bath, Department of Chemistry, Bath, United Kingdom
Pages: 1755-1760
Published: 201408
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 18
Accession Number: 2014-104719
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201452
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