La 0.95 Sr 0.05 CoO 3 : An efficient room-temperature thermoelectric oxide

Abstract

We present measurements of electrical resistivity, thermal conductivity and thermopower of polycrystalline Sr-doped LaCoO3 with composition La0.95Sr0.05CoO3. Our data show that the investigated compound exhibits a very respectable room temperature thermoelectric figure of merit value of 0.18. Our results not only show that oxides are promising candidates for thermoelectric cooling applications, but also point towards the need for careful theoretical calculations that will serve as a guide in producing the next generation of thermoelectric materials.Comment: 13 pages, 3 figures, Accepted in Appl. Phys. Lett. scheduled to appear on Feb 17, 2004 issu

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“…These values are somewhat higher than the power factor reported in Ref. [28] for La 0.95 Sr 0.05 CoO 3 but are much smaller than the value reported by Androulakis et al [27], who found an unusually large Seebeck coefficient (700 µV K -1 at 300 K).…”

“…Both the bismuth cobaltite and the cobalt perovskites are known to display thermoelectrical properties [24][25][26][27][28]. In Fig.…”

High-performance nanostructured thermoelectric materials

“…Th e strong electronic correlation eff ect in this material has been attributed to the unusually large Seebeck coeffi cient [77]. Many researchers subsequently started to explore high-performance oxides for TE applications, and some promising TE oxides have emerged, including Zn 1-x Al x O (n-type, ZT ≈ 0.30 at 1273 K) [78], La 1-x Sr x CoO 3 (p-type, ZT ≈ 0.18 at room temperature) [79], and La 1-x Y x CuO 4 (p-type, ZT ≈ 0.17 at 330 K) [80].…”

Room-temperature ferromagnetism inSr1−xYxCoO3−δKobayashi1, Ishiwata2, Terasaki3 et al. 2005Phys. Rev. B9214780View full textAdd to dashboardCite

“…Perovskite Co oxides also show very rich physics such as spin-state transition [4,5], ferromagnetism [6], and thermoelectricity [7]. The ferromagnetism in the perovskite Co oxide La 1−x Sr x CoO 3 has been explained in terms of the double-exchange interaction between Co 3+ and Co 4+ in the intermediate spin state.…”