期刊
JOURNAL OF ELECTRONIC MATERIALS
卷 45, 期 3, 页码 1942-1946出版社
SPRINGER
DOI: 10.1007/s11664-015-4303-6
关键词
Zintl phase; thermoelectric; power factor; Seebeck coefficient
资金
- Academia Sinica
- Ministry of Science and Technology (MOST), Taiwan [MOST 103-2112-M-001-021-MY3]
p-Type Ca1-xEuxZn2Sb2 (0 <= x <= 1) polycrystalline specimens were prepared by direct solid-state reaction of elements followed by appropriate annealing, grinding and spark plasma sintering for densification. The thermoelectric (TE) properties of Zintl phase Ca1-xEuxZn2Sb2 were investigated by measuring resistivity, Seebeck coefficient and thermal conductivity from 300 K to 720 K. All Eu doped specimens show more than 50% decrease in electrical resistivity, while their Seebeck coefficient value only slightly decrease as compared to CaZn2Sb2. Furthermore, a reduction of thermal conductivity was achieved by the additional phonon scatterings of Eu dopants. The cationic substitution of rare earth element Eu in the Ca-site significantly increased the thermoelectric dimensionless figure of merit for all Europium substituted samples. Within this series, EuZn2Sb2 shows a good thermoelectric property with a maximum zT value of 0.98 at 720 K.
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