Low-temperature behaviour of ammonium ion in buddingtonite [N(D/H)<Subscript>4</Subscript>AlSi<Subscript>3</Subscript>O<Subscript>8</Subscript>] from neutron powder diffraction期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Low-temperature behaviour of ammonium ion in buddingtonite [N(D/H)4AlSi3O8] from neutron powder diffraction

Authors:	M.?Mookherjee author-information" > author-information__contact u-icon-before" > mailto:satr@esc.cam.ac.uk,mainak@umich.edu" title=" satr@esc.cam.ac.uk,mainak@umich.edu" itemprop=" email" data-track=" click" data-track-action=" Email author" data-track-label=" " >Email author,S. A. T.?Redfern,I.?Swainson,D. E.?Harlov

Affiliation:	(1) Mineral Science Group, Department of Earth Sciences, University of Cambridge, CB2 3EQ, UK;(2) Neutron Program for Material Research, National Research Council of Canada, Chalk River Labs, Chalk River, ON, K0J 1J0;(3) GeoForschungsZentrum Potsdam, Telegrafenberg, 14473, Potsdam, Germany;(4) Present address: Department of Geological Sciences, University of Michigan, MI-48109, USA

Abstract:	The structural response of buddingtonite [N(D/H)₄AlSi₃O₈] on cooling has been studied by neutron diffraction. Data have been collected from 280 K down to 11 K, and the crystal structure refined using the Rietveld method. Rigid-body constraints were applied to the ammonium ion to explore the structural properties of ammonium in the M-site cavities at low-temperature. Low-temperature saturation is observed for almost all the lattice parameters. From the present in situ low-temperature neutron diffraction studies, there is no strong evidence of orientational order–disorder of the ammonium ions in buddingtonite.

Keywords:	Ammonium Buddingtonite Neutron Rigidbody
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