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2005
Superconductors
D 8000
Crystal Structure and Real Structure Investigations on the Intermittent Superof "La5B2C6". — The phase La5B2C6 is reported in the literature both to
16- 016 conductivity
become superconducting at 6.9 K as well as to be non-superconducting down to 2 K.
These properties can be changed by an appropriate thermal pretreatment of the samples.
Detailed preparative, analytical and x-ray structural studies on a single sample which
exhibits such intermittent superconductivity show that superconductivity is not an
intrinsic property of the phase La5B2C6, but must be ascribed to precipitations of
boron-containing La2C3-δ in the C-rich region and α- resp. β-La in the metal-rich
region. Obviously, the complete coverage of borocarbide crystallites by La can result
in a total magnetic shielding of the samples. — (SIMON*, A.; BABIZHETSKYY, V.;
OECKLER, O.; MATTAUSCH, H.; BAUER, J.; KREMER, R. K.; Z. Anorg. Allg.
Chem. 631 (2005) 2-3, 316-326; MPI Festkoerperforsch., D-70569 Stuttgart,
Germany; Ger., Abstr. Eng.) — Schramke
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