Intermetallic compounds Zr1-xLaxNiSn (x = 0.05, 0.1, 0.15, 0.2, 0.3, 0.4) and Zr0.98R0.02NiSn0.98X0.02(R = La, Ce; X=Sb, Bi) were synthesized using arc melting and spark plasma sintering (SPS) techniques. The changes of their crystal structures were analyzed by using X-ray diffractometer. Thermoelectric properties were evaluated in the temperature range of 300 to 925 K. For x≤0.15, single-phase samples can be obtained. With x > 0.15, a non-half-heusler phase formed. The content of the second phase increases with x. For the samples with x≤0.15, rare-earth doping can effectively reduce the thermal conductivity while keeping good electrical transport. The maximum value of ZT was obtained in Zr0.98La0.02NiSn0.98Sb0.02, which reaches 0.5 at 575K.
LI Xiao-Guang
,
HUO De-Xuan
,
HE Cai-Jun
,
ZHAO Shi-Chao
,
Lü Yan-Fei
. Effect of Rare-earth Doping on the Thermoelectric Properties of the Tin-based Half-Heusler Alloys[J]. Journal of Inorganic Materials, 2010
, 25(6)
: 573
-576
.
DOI: 10.3724/SP.J.1077.2010.00573
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