Neutron diffraction study, magnetic properties and thermal stability of YMn{sub 2}D{sub 6} synthesized under high deuterium pressure

Journal Article · Sat Jan 15 04:00:00 EST 2005 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2004.05.066· OSTI ID:20721706

Paul-Boncour, V ^[1]; Filipek, S M ^[2]; Dorogova, M ^[2]; Bouree, F ^[3]; Andre, G ^[3]; Marchuk, I ^[2]; Percheron-Guegan, A ^[1]; Liu, R S ^[4]

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1. Laboratoire de Chimie Metallurgique des Terres Rares, CNRS, 2-8 rue Henri Dunant, 94320 Thiais Cedex (France)
2. Institute of Polish Chemistry. PAN, UL. Kasprzaka 44/52, 01224 Warsaw (Poland)
3. Laboratoire Leon Brillouin, CEA-CNRS, CEA/Saclay, 91191 Gif-sur-Yvette (France)
4. Department of Chemistry, National Taiwan University, Taipei 106, Taiwan (China)

A new phase YMn{sub 2}D{sub 6} was synthesized by submitting YMn{sub 2} to 1.7kbar deuterium pressure at 473K. According to X-ray and neutron powder diffraction experiments, YMn{sub 2}D{sub 6} crystallizes in the Fm3-bar m space group with a=6.709(1)A at 300K. The Y and half of the Mn atoms occupy statistically the 8c site whereas the other Mn atoms are located in 4a site and surrounded by 6D atoms (24e). This corresponds to a K{sub 2}PtCl{sub 6}-type structure with a partially disordered substructure which can be written as [YMn]MnH{sub 6}. No ordered magnetic moment is observed in the NPD patterns and the magnetization measurements display a paramagnetic behavior. The study of the thermal stability by Differential Scanning Calorimetry and XRD experiments indicates that this phase decomposes in YD{sub 2} and Mn at 625K, and is more stable than YMn{sub 2}H{sub 4.5}.

• OSTI ID: 20721706
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 1 Vol. 178; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
CALORIMETRY
CUBIC LATTICES
DEUTERIDES
DEUTERIUM
HYDRIDES
LAVES PHASES
MAGNETIC MOMENTS
MAGNETIC PROPERTIES
MAGNETIZATION
MANGANESE COMPOUNDS
NEUTRON DIFFRACTION
PARAMAGNETISM
PRESSURE RANGE MEGA PA 100-1000
SPACE GROUPS
STABILITY
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS