Structural and magnetic properties of RMn{sub 2-x}Fe{sub x}D{sub 6} compounds (R=Y, Er; x{<=}0.2) synthesized under high deuterium pressure

Journal Article · Tue Feb 15 04:00:00 EST 2011 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2010.12.017· OSTI ID:21494211

Paul-Boncour, V ^[1]; Filipek, S M; Sato, R; Wierzbicki, R ^[2]; Andre, G; Porcher, F ^[3]; Reissner, M; Wiesinger, G ^[4]

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1. Institut de Chimie et des Materiaux de Paris Est, CMTR, CNRS and U-PEC, 2-8 rue H. Dunant, 94320 Thiais (France)
2. Institute of Physical Chemistry, PAN, UL. Kasprzaka 44/52, 01224 Warsaw (Poland)
3. Laboratoire Leon Brillouin, CEA-CNRS, CEA/Saclay, 91191 Gif-sur-Yvette (France)
4. Institute fuer Solid State Physics, TU Vienna, Wiedner Haupstrasse 8-10, A1040 Vienna (Austria)

RMn{sub 2-x}Fe{sub x}D{sub 6} compounds were obtained by applying a deuterium pressure of several kbar to RMn{sub 2-x}Fe{sub x} compounds for x{<=}0.2 and R=Y, Er. These compounds are isostructural to RMn{sub 2}D{sub 6} compounds and crystallize in a K{sub 2}PtCl{sub 6} type structure with a random substitution of R and half the Mn atoms in the same 8c site whereas the other Mn atoms are located on the 4a site and surrounded by six D atoms (24e site). According to neutron powder diffraction analysis the Fe atoms are preferentially substituted on the 4a site. YMn{sub 2-x}Fe{sub x}D{sub 6} compounds are paramagnetic and their molar susceptibility follows a modified Curie-Weiss law. ErMn{sub 2-x}Fe{sub x}D{sub 6} compounds display a ferromagnetic behavior at 2 K, but their saturation magnetization (M{sub S{approx}}4.0 {mu}{sub B}/f.u.) is half that of their parent compounds (M{sub S{approx}}8.0 {mu}{sub B}/f.u.). The neutron diffraction patterns of ErMn{sub 1.8}Fe{sub 0.2}D{sub 6} display below 13 K both ferromagnetic and antiferromagnetic short range order, which can be related to a disordered distribution of Er moments. The paramagnetic temperatures of ErMn{sub 2-x}Fe{sub x}D{sub 6} compounds are negative and decrease versus the Fe content whereas they are positive and increase for their parent compounds. -- Graphical abstract: Neutron powder diffraction (NPD) patterns of ErMn{sub 1.8}Fe{sub 0.2}D{sub 6} at 1.4 and 30 K measured on G4.1 spectrometer. Inset: difference curves between the NPD patterns measured at T{sub 1} and 30 K showing ferromagnetic (FM) and antiferromagnetic (AFM) short range order. Display Omitted Research highlights: {yields} RMn{sub 2-x}Fe{sub x} compounds (x{<=}0.2) were synthesized under 10 kb deuterium pressure. {yields} The Fe atoms are substituted to Mn on 4a site. {yields} RMn{sub 2-x}Fe{sub x}D{sub 6} desorb D up to 1115 K forming the parent intermetallics by recombination. {yields} ErMn{sub 2-x}Fe{sub x}D{sub 6} compounds show coexistence of ferro- and antiferromagnetic SRO below 10 K.

• OSTI ID: 21494211
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 2 Vol. 184; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALLOYS
ANTIFERROMAGNETISM
ATOMIC FORCE MICROSCOPY
COHERENT SCATTERING
CURIE-WEISS LAW
DEUTERIDES
DEUTERIUM
DEUTERIUM COMPOUNDS
DIFFRACTION
ERBIUM ALLOYS
HYDROGEN COMPOUNDS
HYDROGEN ISOTOPES
INTERMETALLIC COMPOUNDS
IRON ALLOYS
ISOTOPES
LAVES PHASES
LIGHT NUCLEI
MAGNETIC PROPERTIES
MAGNETISM
MAGNETIZATION
MANGANESE ALLOYS
MICROSCOPY
NEUTRON DIFFRACTION
NUCLEI
ODD-ODD NUCLEI
PARAMAGNETISM
PHYSICAL PROPERTIES
RARE EARTH ALLOYS
SCATTERING
STABLE ISOTOPES
TEMPERATURE RANGE
TEMPERATURE RANGE 0000-0013 K
TEMPERATURE RANGE 1000-4000 K
TRANSITION ELEMENT ALLOYS
YTTERBIUM ALLOYS