Gallium Antimonide-Doped Germanium Clathrate—A p-Type Thermoelectric Cage Structure

✍ Scribed by Susan Latturner; Xianhui Bu; Nick Blake; Horia Metiu; Galen Stucky

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 172 KB
• Volume: 151
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.2000.8622

✦ Synopsis

A germanium clathrate compound doped with gallium antimonide has been synthesized and characterized. The structure of Ba 8 Ga 16 (GaSb) x Ge 30؊2x with x ‫؍‬ 2 was determined using singlecrystal X-ray analysis, and the Sb atoms were found to be selectively sited. A slight excess of antimony was con5rmed by microprobe elemental analysis, resulting in uncompensated doping of the framework. A positive and relatively high Seebeck coe7cient of 100 V/K indicates this compound is a potential p-type thermoelectric material. Single-crystal temperature-dependent conductivity indicates that the sample behaves as a poor metal. This is the 5rst example of p-doping reported for clathrates.