TY - JOUR
T1 - Low temperature synthesis of LnOF rare-earth oxyfluorides through reaction of the oxides with PTFE
AU - Dutton, S. E.
AU - Hirai, D.
AU - Cava, R. J.
N1 - Funding Information:
The authors would like to acknowledge helpful discussions with Shuang Jia, Ni Ni, Esteban Climent-Pascual and Collin Broholm. This research was supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering under Award DE-FG02-08ER46544.
PY - 2012/3
Y1 - 2012/3
N2 - A low temperature solid-state synthesis route, employing polytetrafluoroethylene (PTFE) and the rare-earth oxides, for the formation of the LnOF rare-earth oxyfluorides (Ln = Y, La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er), is reported. With the exception of LaOF, which forms in a tetragonal variant, rhomobohedral LnOF is found to be the major product of the reaction. In the case of PrOF, a transition from the rhombohedral to the cubic fluorite phase is observed on heating in air to 500 °C. X-ray diffraction shows the expected lanthanide contraction in the lattice parameters and bond lengths. Magnetic susceptibility measurements show antiferromagnetic-like ordering in TbOF, T m = 10 K, with a metamagnetic transition at a field μ 0H t = 1.8 T at 2 K. An antiferromagnetic transition, T N = 4 K, is observed in GdOF. Paramagnetic behavior is observed above 2 K in PrOF, NdOF, DyOF, HoOF and ErOF. The magnetic susceptibility of EuOF is characteristic of Van Vleck paramagnetism.
AB - A low temperature solid-state synthesis route, employing polytetrafluoroethylene (PTFE) and the rare-earth oxides, for the formation of the LnOF rare-earth oxyfluorides (Ln = Y, La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er), is reported. With the exception of LaOF, which forms in a tetragonal variant, rhomobohedral LnOF is found to be the major product of the reaction. In the case of PrOF, a transition from the rhombohedral to the cubic fluorite phase is observed on heating in air to 500 °C. X-ray diffraction shows the expected lanthanide contraction in the lattice parameters and bond lengths. Magnetic susceptibility measurements show antiferromagnetic-like ordering in TbOF, T m = 10 K, with a metamagnetic transition at a field μ 0H t = 1.8 T at 2 K. An antiferromagnetic transition, T N = 4 K, is observed in GdOF. Paramagnetic behavior is observed above 2 K in PrOF, NdOF, DyOF, HoOF and ErOF. The magnetic susceptibility of EuOF is characteristic of Van Vleck paramagnetism.
KW - A. Inorganic compounds
KW - B. Chemical synthesis
KW - C. X-ray diffraction
KW - D. Crystal structure
KW - D. Magnetic properties
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U2 - 10.1016/j.materresbull.2011.12.014
DO - 10.1016/j.materresbull.2011.12.014
M3 - Article
AN - SCOPUS:84857499964
SN - 0025-5408
VL - 47
SP - 714
EP - 718
JO - Materials Research Bulletin
JF - Materials Research Bulletin
IS - 3
ER -