La0.95Sr0.05CoO3: An efficient room-temperature thermoelectric oxide

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 toward the need for careful theoretical calculations that will serve as a guide in producing the next generation of thermoelectric materials.

[1]  Jung,et al.  Conduction in LaCoO3 by small-polaron hopping below room temperature. , 1996, Physical review. B, Condensed matter.

[2]  George S. Nolas,et al.  Semiconducting Ge clathrates: Promising candidates for thermoelectric applications , 1998 .

[3]  H. J. Goldsmid,et al.  Thermoelectric Refrigeration , 1964 .

[4]  M. Cantoni,et al.  Superconductivity above 130 K in the Hg–Ba–Ca–Cu–O system , 1993, Nature.

[5]  R. Cava,et al.  Antimonides with the half-Heusler structure: New thermoelectric materials , 1999 .

[6]  D. Segal.  Chemical synthesis of ceramic materials , 1997 .

[7]  P. Migiakis,et al.  Thermoelectric properties of LaNi1-xCoxO3 solid solution , 2003 .

[8]  T. Tritt,et al.  Transition-metal pentatellurides as potential low-temperature thermoelectric refrigeration materials , 1999 .

[9]  F. Disalvo,et al.  Thermoelectric cooling and power generation , 1999, Science.

[10]  Masatoshi Sato,et al.  Transport and Magnetic Properties of R1-xAxCoO3 (R = La, Pr and Nd; A = Ba, Sr and Ca) , 2003, cond-mat/0302435.

[11]  G. Shirane,et al.  Magnetic and transport properties of LaCo1-xNixO3-Comparison with La1-xSrxCoO3 , 1999 .

[12]  M. Marezio,et al.  Superconductivity at 94 K in HgBa2Cu04+δ , 1993, Nature.

[13]  T. Okuda,et al.  Large thermoelectric response of metallic perovskites: Sr 1 − x La x TiO 3 ( 0 x 0 . 1 ) , 2001 .

[14]  R. K. Williams,et al.  Filled Skutterudite Antimonides: A New Class of Thermoelectric Materials , 1996, Science.

[15]  S. Maekawa,et al.  Thermopower in cobalt oxides , 2000 .

[16]  Ichiro Terasaki,et al.  Large thermoelectric power in NaCo 2 O 4 single crystals , 1997 .

[17]  I. Terasaki,et al.  Thermoelectric Properties of NaCo2-xCuxO4 Improved by the Substitution of Cu for Co , 2001 .

[18]  K. Suzuki.  Magnetic, electrical and thermal properties of La0.80Sr0.20(MnyCo1$minus;y)O3 , 2003 .

[19]  K. Koumoto,et al.  Influence of ionic size of rare-earth site on the thermoelectric properties of RCoO3-type perovskite cobalt oxides , 2001 .