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MA: Fachverband Magnetismus

MA 15: Poster:ThinFilms(1-33),Transp.(34-49),ExchBias(50-56),
Spindynamics(57-70),Micro-nanostr.Mat.(71-82),
Particles/Clust.(83-88), Mag.Imag./Surface(89-96),
Spinelectronics(97-109), Theory/Micromag.(110-116),
Spinstruct/Phasetr.(117-128),Magn.Mat.(129-139),
Aniso.+Measuring(140-145), MolMag.(146-152),
MSMA(153-156)

MA 15.135: Poster

Dienstag, 27. März 2007, 15:00–19:00, Poster A

Crystal structure and physical properties of Eu₄Pd₂₉B₈ and YbNi₇B₃ borides — Igor Veremchuk, •Roman Gumeniuk, Andreas Leithe-Jasper, Walter Schnelle, Yuri Prots, and Yuri Grin — Max-Planck-Institut für Chemische Physik

Crystal structures of the ternary borides Eu₄Pd₂₉B₈ (I41/amd (no. 141), a = 8.5686(4) Å, c = 16.596(1) Å, Z = 2, ) and YbNi₇B₃ (structure type ErNi₇B₃ [1], s.g. I41/amd (no. 141), a = 7.6419(4) Å, c = 15.568(1) Å, Z = 8) were refined by means of X-ray single-crystal method. A X-ray absorption spectroscopic study at the Yb-L_III and Eu-L_III edges as well as measurements of magnetic susceptibility show Eu atoms to be in mixed (+2–+3) valence state while a stable +3 valence state is observed for the Yb-containing boride. Magnetic susceptibility data of the Eu₄Pd₂₉B₈ compound indicate a thermally induced valence change from nonmagnetic 4f⁷ to magnetic 4f⁶ state.

[1] Kuz’ma Yu. B., Babizhetskyj V., Veremchuk I. and Chaban N. J. Solid State Chemistry, 177 425-430 (2004).