title: A new type of thermoelectric material, EuZn2Sb2.
abstract: Polycrystalline EuZn(2)Sb(2) is prepared by direct reaction of the elements. Its composition, structure, magnetism, heat capacity, and thermoelectric properties have been investigated. EuZn(2)Sb(2) crystallizes in p3m space group with a=4.4932(7) A and c=7.6170(10) A. Antiferromagnetic ordering is detected at the Neel temperature of 13.06 K, and the saturation magnetization reaches 6.87mu(B)Eu at 2 K and 7 T. Eu ion has +2 valence. Its Hall effects are characterized by a high positive Hall coefficient of +0.226 cm(3)C, proper carrier concentration of 2.77x10(19)cm(3), and high carrier mobility of 257 cm(2)V s at 300 K. This compound shows high p-type Seebeck coefficient (+122 to +181 muVK), low lattice thermal conductivity (1.60-0.40 Wm K), and high electrical conductivity (1137-524 Scm). The obtained figure of merit and powder factor reach 0.92 and 20.72 muWcm K(2), respectively. The thermoelectric properties of EuZn(2)Sb(2) are encouraging.
authors.affiliation: State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, People's Republic of China.
authors.forename: Hui
authors.initials: H
authors.lastname: Zhang
authors.forename: Jing-Tai
authors.initials: JT
authors.lastname: Zhao
authors.forename: Yu
authors.initials: Y
authors.lastname: Grin
authors.forename: Xiao-Jun
authors.initials: XJ
authors.lastname: Wang
authors.forename: Mei-Bo
authors.initials: MB
authors.lastname: Tang
authors.forename: Zhen-Yong
authors.initials: ZY
authors.lastname: Man
authors.forename: Hao-Hong
authors.initials: HH
authors.lastname: Chen
authors.forename: Xin-Xin
authors.initials: XX
authors.lastname: Yang