TY  - JOUR
A1  - Nguyen, Lien Thi Kim
A1  - Aydemir, Umut
A1  - Baitinger, Michael
A1  - Custers, Jeroen
A1  - Haghighirad, Amir-Abbas
A1  - Höfler, Rudolf
A1  - Luther, Klaus-Dieter
A1  - Ritter, Franz
A1  - Grin, Yuri
A1  - Aßmus, Wolf
A1  - Paschen, Silke
T1  - Physical properties of single-crystalline Ba 8 Ni 3.5 Ge 42.1 h 0.4
T2  - Journal of electronic materials
N2  - Clathrates are candidate materials for thermoelectric applications because of a number of unique properties. The clathrate I phases in the Ba-Ni-Ge ternary system allow controlled variation of the charge carrier concentration by adjusting the Ni content. Depending on the Ni content, the physical properties vary from metal-like to insulator-like and show a transition from p-type to n-type conduction. Here we present first results on the characterization of millimeter-sized single crystals grown by the Bridgman technique. Single crystals with a composition of Ba8Ni3.5Ge42.1h0.4 show metallic behavior (dp/dT > 0) albeit with high resistivity at room temperature [p (300 K) = 1 mOhm cm]. The charge carrier concentration at 300 K, as determined from Hall-effect measurements, is 2.3 e-/unit cell. The dimensionless thermoelectric figure of merit estimated at 680 K is ZT ~ 0.2. Keywords Clathrates - thermoelectric material - intermetallic compound - nickel
KW  - clathrates
KW  - thermoelectric material
KW  - intermetallic compound
KW  - nickel
Y1  - 2010
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/7948
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30-72063
SN  - 1543-186X
SN  - 0361-5235
N1  - Open Access: This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.
VL  - 39
IS  - 9
SP  - 1386
EP  - 1389
PB  - TMS
CY  - Warrendale, Pa
ER  -