TY - JOUR
T1 - Thermoelectric Properties of Zintl Phase Compounds of Ca1−xEuxZn2Sb2 (0 ≤ x ≤ 1)
AU - Wubieneh, Tessera Alemneh
AU - Wei, Pai Chun
AU - Yeh, Chien Chih
AU - Chen, Szu yuan
AU - Chen, Yang Yuan
N1 - Funding Information:
The authors would like to thank Chia-Hsiang Chang for technical help. This work is financially supported by Academia Sinica and Ministry of Science and Technology (MOST), Taiwan, Grant No. MOST 103-2112-M-001-021-MY3.
Publisher Copyright:
© 2015, The Minerals, Metals & Materials Society.
PY - 2016/3/1
Y1 - 2016/3/1
N2 - 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.
AB - 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.
UR - https://www.scopus.com/pages/publications/84959459622
UR - https://www.scopus.com/pages/publications/84959459622#tab=citedBy
U2 - 10.1007/s11664-015-4303-6
DO - 10.1007/s11664-015-4303-6
M3 - Article
AN - SCOPUS:84959459622
SN - 0361-5235
VL - 45
SP - 1942
EP - 1946
JO - Journal of Electronic Materials
JF - Journal of Electronic Materials
IS - 3
ER -