Towards MXPn‐Type Compounds in the Systems Ge‐I‐Pn (Pn = P, As) – New Insights in the Structures and Properties of Inverse Type I Clathrates. Issue 21 (29th August 2017)

• Record Type: Journal Article
• Authors: Baumer, Franziska; Reiter, Felix; Nilges, Tom
• Is Part Of: Zeitschrift für anorganische und allgemeine Chemie. Volume 643:Issue 21(2017)
• Page Start: 1444
• Page End: 1450
• Publication Date: 2017-08-29
• Subjects: Inverse clathrates -- Semiconductors -- Thermoelectric properties -- Germanium -- Iodine; Chemistry, Inorganic -- Periodicals; Chemistry -- Periodicals; 540
• DOI: 10.1002/zaac.201700231
• Languages: English
• ISSNs: 0044-2313

Abstract

Abstract : Two ternary systems, Ge‐I‐P and Ge‐I‐As were investigated for the existence of double helical GeI Pn phases ( Pn = P, As). However, experiments in the temperature range of 673–1073 K always led to the formation of inverse type I clathrates. Optimization of the synthesis parameters resulted in phase pure samples for both clathrates on a gram scale. We found slightly varying compositions than for clathrates reported before in the two systems. Structural characterization by means of single crystal analysis and Rietveld refinement showed a defect model for the guest structures in combination with a mixed site occupancy for the host lattice sites. Both compounds reveal promising thermal conductivities and Seebeck coefficients but only small overall electrical conductivities. Abstract :