We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Ytterbium valence ordering in the low-temperature superstructure of Yb<sub>2</sub>Pd<sub>2</sub>Cd.
- Authors
Kösters, Jutta; Pöttgen, Rainer
- Abstract
The intermetallic ytterbium compound Yb2Pd2Cd shows a structural phase transition at ∼150 K. The structures of the room-temperature (Mo2B2Fe type, P4/mbm, a = 757.07(7), c = 371.99(4) pm, wR2 = 0.0620, 272 F2 values, 12 variables) and low-temperature (new type, P4/mbm, a = 747.26(4), c = 741.46(4) pm, wR2 = 0.0384, 511 F2 values, 19 variables) modifications were refined from single crystal X-ray diffractometer data. The superstructure formation corresponds to an isomorphic transition of index 2. The driving force for the structural phase transition is an ytterbium charge ordering (the superstructure exhibits two crystallographically independent ytterbium sites) with a much higher degree of divalent ytterbium in the low-temperature modification. The striking structural feature concerns the ytterbium–palladium coordination with different Yb–Pd distances: longer ones for predominantly divalent Yb1 (2 × 284.7 and 4 × 296.1 pm, ∅ = 292.3 pm) and shorter ones for trivalent Yb2 (2 × 277.5 and 4 × 288.4 pm, ∅ = 284.8 pm).
- Subjects
YTTERBIUM; PHASE transitions; INTERMETALLIC compounds; YTTERBIUM compounds; SINGLE crystals; X-ray diffractometers
- Publication
Zeitschrift für Kristallographie. Crystalline Materials, 2024, Vol 239, Issue 1/2, p1
- ISSN
2194-4946
- Publication type
Article
- DOI
10.1515/zkri-2023-0043