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Erbium dirhodium diboron carbide, the end member of the rhodium-based quaternary borocarbides, was synthesized by the flux method. Structure analyses revealed that the compound crystallizes as a derivative structure of the ThCr2Si2 type, which can be viewed as a layered structure of tetrahedrally coordinated Rh2B2 thick layers and ErC NaCl-type layers. A comparison of the structural parameters of the RRh2B2C (R is a rare earth metal) compounds showed that the atomic distance between transition metal atoms contracts significantly with decreasing rare earth size, resulting in increasing instability of compounds with smaller R.

Supporting information

cif

Crystallographic Information File (CIF)
Contains datablocks global, ErRh2B2C

hkl

Structure factor file (CIF format)
Contains datablock ErRh2B2C

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