Thermal expansion of RNi2B2C single crystals

Titelangaben

Jaenicke-Roessler, U. ; Paufler, P. ; Zahn, G. ; Geupel, Sandra ; Behr, G. ; Bitterlich, H.:
Thermal expansion of RNi2B2C single crystals.
In: Journal of Alloys and Compounds. Bd. 333 (2002) Heft 1–2 . - S. 28-33.
ISSN 0925-8388
DOI: https://doi.org/10.1016/S0925-8388(01)01703-0

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Abstract

Structure data and variation of lattice parameters of single crystals of {RNi2B2C} (R=Y, Tb, Dy, Ho, Er, Lu) have been investigated as a function of temperature. Eight quaternary and pseudo-quaternary compounds, respectively, were investigated between 90 and 360 K. Lattice parameters a and unit cell volumes {VUC} increased for all compounds with increasing temperature, while the axial ratios c/a of the unit cell parameters decreased. The most notable observation is a minimum in the temperature dependence of the lattice parameter c, which shifts towards lower temperatures with increasing atomic number {ZR} of the rare earth element. Coefficients of linear thermal expansion for YNi2B2C, for example, vary between αa=4.71×10−6 K−1 (100 K)–13.0×10−6 K−1 (300 K) and αc=−9.93×10−6 K−1 (100 K)–8.24×10−6 K−1 (300 K). Bulk expansion β varies between β=0.73×10−5 K−1 (100 K) and 2.78×10−5 K−1 (300 K).