Bridgman Crystal Growth and Structure Refinement of YbPdGe and YbPtGe – Two Different Superstructures of the KHg2 Type†
Kenichi Katoh Dr.
Department of Applied Physics, National Defense Academy, Hashirimizu 1-10-20 Yokosuka, 239-8686, Japan
Search for more papers by this authorBirgit Heying
Münster, Institut für Anorganische und Analytische Chemie der Universität
Search for more papers by this authorRolf-Dieter Hoffmann
Münster, Institut für Anorganische und Analytische Chemie der Universität
Search for more papers by this authorUte Ch. Rodewald
Münster, Institut für Anorganische und Analytische Chemie der Universität
Search for more papers by this authorCorresponding Author
Rainer Pöttgen Prof. Dr.
Münster, Institut für Anorganische und Analytische Chemie der Universität
Institut für Anorganische und Analytische Chemie, Universität Münster, Corrensstrasse 30, D-48149 Münster, GermanySearch for more papers by this authorKenichi Katoh Dr.
Department of Applied Physics, National Defense Academy, Hashirimizu 1-10-20 Yokosuka, 239-8686, Japan
Search for more papers by this authorBirgit Heying
Münster, Institut für Anorganische und Analytische Chemie der Universität
Search for more papers by this authorRolf-Dieter Hoffmann
Münster, Institut für Anorganische und Analytische Chemie der Universität
Search for more papers by this authorUte Ch. Rodewald
Münster, Institut für Anorganische und Analytische Chemie der Universität
Search for more papers by this authorCorresponding Author
Rainer Pöttgen Prof. Dr.
Münster, Institut für Anorganische und Analytische Chemie der Universität
Institut für Anorganische und Analytische Chemie, Universität Münster, Corrensstrasse 30, D-48149 Münster, GermanySearch for more papers by this authorDedicated to Professor Heinrich Nöth on the Occasion of his 80th Birthday
Abstract
Well shaped single crystals of the equiatomic germanides YbPdGe and YbPtGe were synthesized from the elements using the Bridgman technique. The samples were investigated by X-ray powder and single crystal diffraction: YbAuSn type, Imm2, a = 433.4(2), b = 2050.6(6), c = 752.6(2) pm, wR2 = 0.0723, 1551 F2 values, 58 variables for YbPdGe and TiNiSi type, Pnma, a = 686.32(9), b = 430.47(9), c = 751.02(8) pm, wR2 = 0.0543, 379 F2 values, 20 variables for YbPtGe. Both germanides crystallize with different superstructure variants of the KHg2 type, resulting from different stacking of the puckered Pd3Ge3 and Pt3Ge3 hexagons. While only Pt–Ge interactions occur in the [PtGe] polyanionic network of YbPtGe, weak interlayer Pd–Pd (297 pm) and Ge–Ge (275 pm) interactions occur in YbPdGe. The crystal chemical peculiarities are discussed in the light of the different superstructure formed.
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