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Electron Poor Materials Research Group EPM RG Updates of Experiments in Augsburg --- Crystallographic study of SiB 3, ZnSb… --- Synthetic attempts for.

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Presentation on theme: "Electron Poor Materials Research Group EPM RG Updates of Experiments in Augsburg --- Crystallographic study of SiB 3, ZnSb… --- Synthetic attempts for."— Presentation transcript:

1 Electron Poor Materials Research Group EPM RG Updates of Experiments in Augsburg --- Crystallographic study of SiB 3, ZnSb… --- Synthetic attempts for B --- Property measurements of (ZnSnSb 2 ) 1-x (InSb) 2x

2 Charge Density Study by the Analysis of High Resolution Diffraction Data Bruker AXS diffractometer with Imus micro-focus X-Ray Source Ag-radiation, the same sin at much lower angle Enough data redundancy for good statistics

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7 Multipole Refinement of ZnSb in Jana 2006 Diffraction data were collected at 100K with 2 up to 120 o Extinction and anharmonicity were refined before starting the multipole refinement d electrons of Zn were considered as valence electrons Multipole refinment was stopped at 2 nd order (quadruple) R=1.38% and highest peak of 0.34 e/Å 3

8 Total Density

9 Total Laplacian +/- 8, 4, 2 * 10^n and n is +/- 3, 2, 1.

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11 Dumbbell Rattling?

12 Heat Capacity of ZnSb

13 Synthesis of b - SiB 3 with high pressure

14 Si 1-x Ge x B 3 Si2: 90% Ge2: 10% Si1: 84% Ge1: 16%

15 Thermoelectric Chalcopyrite (ZnSnSb 2 ) 1-x (InSb) 2x + 4Sn x = 0.9, x = 0.85, x=0.8 and InSb (quenched from 1:1 melt and Sn- flux growth)

16 InSb Seebeck

17 All Seebecks from Augsburgs work

18 All TCs from Augsburgs work

19 All Resistivities

20 Acknowledgement Dr. Wolfgang Scherer Dr. Ernst-Wilhelm Scheidt Dr. Georg Eickerling Dr. Francisco J. Garcia-Garcia Christoph Hauf Andreas Fischer


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