Synthesis and thermoelectric characterization of polycrystalline Ni1-xCaxCo2O4 (x= 0-0.05) spinel materials
Ca doped NiCo2O4 spinel materials were synthesised by conventional solid state reactions at 900 C. Thermoelectric properties of polycrystalline products were characterised at a high temperature range of about 800 C in air. Direct current conductivity of the prepared polycrystalline 5 mol% Ca doped N...
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| Veröffentlicht in: | Journal of materials science. Materials in electronics 2004-12, Vol.15 (12), p.769-773 |
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| container_title | Journal of materials science. Materials in electronics |
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| creator | FUJISHIRO, Yoshinobu HAMAMOTO, Kouich SHIONO, Osamu KATAYAMA, Shingo AWANO, Masanobu |
| description | Ca doped NiCo2O4 spinel materials were synthesised by conventional solid state reactions at 900 C. Thermoelectric properties of polycrystalline products were characterised at a high temperature range of about 800 C in air. Direct current conductivity of the prepared polycrystalline 5 mol% Ca doped NiCo2O4 was about 60 S/m at 300 C. The value of dc conductivity increased with increasing temperature. Thermoelectric voltage of polycrystalline Ni1-xCaxCo2O4 (x = 0-0.05) was positive at 300-800 C, showing p-type thermoelectric properties. The Seebeck coefficient of 5 mol% Ca doped NiCo2O4 was about 300 microV/K at 600 C. The value of the Seebeck coefficient of Ni1-xCaxCo2O4 polycrystalline products decreased with increasing temperature. The thermal conductivity of 5 mol% Ca doped NiCo2O4 was about 2.2 W/m.K at 600 C. The estimated thermoelectric figure-of-merit of 5 mol% Ca doped NiCo2O4 spinel polycrystalline product was about 3.5 x 10 exp(-5)/K at 600 C. 17 refs. |
| doi_str_mv | 10.1023/b:jmse.0000045297.61233.58 |
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Thermoelectric properties of polycrystalline products were characterised at a high temperature range of about 800 C in air. Direct current conductivity of the prepared polycrystalline 5 mol% Ca doped NiCo2O4 was about 60 S/m at 300 C. The value of dc conductivity increased with increasing temperature. Thermoelectric voltage of polycrystalline Ni1-xCaxCo2O4 (x = 0-0.05) was positive at 300-800 C, showing p-type thermoelectric properties. The Seebeck coefficient of 5 mol% Ca doped NiCo2O4 was about 300 microV/K at 600 C. The value of the Seebeck coefficient of Ni1-xCaxCo2O4 polycrystalline products decreased with increasing temperature. The thermal conductivity of 5 mol% Ca doped NiCo2O4 was about 2.2 W/m.K at 600 C. The estimated thermoelectric figure-of-merit of 5 mol% Ca doped NiCo2O4 spinel polycrystalline product was about 3.5 x 10 exp(-5)/K at 600 C. 17 refs.</description><identifier>ISSN: 0957-4522</identifier><identifier>EISSN: 1573-482X</identifier><identifier>DOI: 10.1023/b:jmse.0000045297.61233.58</identifier><language>eng</language><publisher>Norwell, MA: Springer</publisher><subject>Condensed matter: electronic structure, electrical, magnetic, and optical properties ; Conductivity phenomena in semiconductors and insulators ; Cross-disciplinary physics: materials science; rheology ; Electronic transport in condensed matter ; Exact sciences and technology ; Growth from solid phases (including multiphase diffusion and recrystallization) ; Materials science ; Methods of crystal growth; physics of crystal growth ; Physics ; Thermoelectric and thermomagnetic effects</subject><ispartof>Journal of materials science. 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Materials in electronics</title><description>Ca doped NiCo2O4 spinel materials were synthesised by conventional solid state reactions at 900 C. Thermoelectric properties of polycrystalline products were characterised at a high temperature range of about 800 C in air. Direct current conductivity of the prepared polycrystalline 5 mol% Ca doped NiCo2O4 was about 60 S/m at 300 C. The value of dc conductivity increased with increasing temperature. Thermoelectric voltage of polycrystalline Ni1-xCaxCo2O4 (x = 0-0.05) was positive at 300-800 C, showing p-type thermoelectric properties. The Seebeck coefficient of 5 mol% Ca doped NiCo2O4 was about 300 microV/K at 600 C. The value of the Seebeck coefficient of Ni1-xCaxCo2O4 polycrystalline products decreased with increasing temperature. The thermal conductivity of 5 mol% Ca doped NiCo2O4 was about 2.2 W/m.K at 600 C. 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Materials in electronics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>FUJISHIRO, Yoshinobu</au><au>HAMAMOTO, Kouich</au><au>SHIONO, Osamu</au><au>KATAYAMA, Shingo</au><au>AWANO, Masanobu</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Synthesis and thermoelectric characterization of polycrystalline Ni1-xCaxCo2O4 (x= 0-0.05) spinel materials</atitle><jtitle>Journal of materials science. Materials in electronics</jtitle><date>2004-12-01</date><risdate>2004</risdate><volume>15</volume><issue>12</issue><spage>769</spage><epage>773</epage><pages>769-773</pages><issn>0957-4522</issn><eissn>1573-482X</eissn><abstract>Ca doped NiCo2O4 spinel materials were synthesised by conventional solid state reactions at 900 C. Thermoelectric properties of polycrystalline products were characterised at a high temperature range of about 800 C in air. Direct current conductivity of the prepared polycrystalline 5 mol% Ca doped NiCo2O4 was about 60 S/m at 300 C. The value of dc conductivity increased with increasing temperature. Thermoelectric voltage of polycrystalline Ni1-xCaxCo2O4 (x = 0-0.05) was positive at 300-800 C, showing p-type thermoelectric properties. The Seebeck coefficient of 5 mol% Ca doped NiCo2O4 was about 300 microV/K at 600 C. The value of the Seebeck coefficient of Ni1-xCaxCo2O4 polycrystalline products decreased with increasing temperature. The thermal conductivity of 5 mol% Ca doped NiCo2O4 was about 2.2 W/m.K at 600 C. The estimated thermoelectric figure-of-merit of 5 mol% Ca doped NiCo2O4 spinel polycrystalline product was about 3.5 x 10 exp(-5)/K at 600 C. 17 refs.</abstract><cop>Norwell, MA</cop><pub>Springer</pub><doi>10.1023/b:jmse.0000045297.61233.58</doi><tpages>5</tpages></addata></record> |
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| subjects | Condensed matter: electronic structure, electrical, magnetic, and optical properties Conductivity phenomena in semiconductors and insulators Cross-disciplinary physics: materials science rheology Electronic transport in condensed matter Exact sciences and technology Growth from solid phases (including multiphase diffusion and recrystallization) Materials science Methods of crystal growth physics of crystal growth Physics Thermoelectric and thermomagnetic effects |
| title | Synthesis and thermoelectric characterization of polycrystalline Ni1-xCaxCo2O4 (x= 0-0.05) spinel materials |
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