ChemInform Abstract: Thermoelectric Properties of Cu1‐xPtxFeO2 (0.0 ≤ x ≤ 0.05) Delafossite‐Type Transition Oxide.

Ruttanapun, Chesta; Wichainchai, Aree; Prachamon, Wutthisak; Yangthaisong, A.; Charoenphakdee, Anek; Seetawan, Tosawat

doi:10.1002/chin.201119008

ChemInform

2011

DOI: 10.1002/chin.201119008

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ChemInform Abstract: Thermoelectric Properties of Cu_1‐xPt_xFeO₂ (0.0 ≤ x ≤ 0.05) Delafossite‐Type Transition Oxide.

Chesta Ruttanapun

Aree Wichainchai

Wutthisak Prachamon

et al.

Abstract: 0 ≤ x ≤ 0.05) Delafossite-Type Transition Oxide. -The title compounds are prepared by solid state reaction of stoichiometric mixtures of CuO, Fe2O3, and PtCl2 (1050°C, 15-25 h) and characterized by powder XRD, SEM, and thermoelectric measurements between 300 and 960 K. Small Pt substitution in CuFeO2 improves the thermoelectric properties and enhances the good semiconducting behavior. The highest figure of merit is 0.05 for x = 0.05 at 960 K. The materials may be invented in thermoelectric devices for covering… Show more

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Influence of Na Doping on the Thermoelectric Properties of CuAlO2 Delafossite

Wongcharoen

Gaewdang

2014

AMR

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The polycrystalline Na-doped CuAlO2 ceramics were obtained by solid state reaction method. The mixture of high purity grade of CuO, Al2O3 and NaNO36H2O powders was ground and then pressed by using uniaxial pressure. The obtained pellet was sintered in air at 1,423 K for 24 h. XRD patterns showed the crystal structure of the as-sintered Cu1-xNaxAlO2 (0x0.05) belonging to rhombohedral, space groupalong with the CuO and CuAl2O4 phases. The minimum resistivity value around 4.48x102 Ωcm and maximum hole concentration around 2.04x1016 cm-3 were observed for x=0.03 at room temperature. The properties of Seebeck coefficient and electrical resistivity were measured in the high temperature ranging 300 to 700 K. The results of electrical resistivity, Seebeck coefficient and power factor values decrease with increasing Na content. The calculated activation energy of conductivity (in the range of 160-250 meV) is larger than that of thermopower (in the range of 26-83 meV) which suggests that the conduction mechanism may be determined as a small polaron hopping type.

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Influence of Na Doping on the Thermoelectric Properties of CuAlO2 Delafossite

Wongcharoen

Gaewdang

2014

AMR

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Method of High Active Preparation and Electrical Properties of CuFeO2 Delafossite-Type

Rudradawong

Wichainchai

Sakulkalavek

et al. 2014

AMR

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In this paper, the CuFeO2compound were prepared by classical solid state reaction (CSSR) and direct powder dissolved solution (DPDS) method from starting material metal oxides and metal powders. Preparation of two methods shows that, direct powder dissolved solution faster recover phases than classical solid state reaction method. The fastest method gets from starting materials Cu and Fe metal powders, the electrical conductivity, Seebeck coefficient, carrier concentration and mobility are 10.68 S/cm, 244.59 μV/K, 12.86×1016cm-3and 494.96 cm2/V.s, respectively. In addition, each CuFeO2compounds were investigated on crystal structure and electrical properties. From XRD and SEM results, all samples have a crystal structure delafossite-typeand a large grain boundary more than 15 μm by electrical conductivity corresponds to grain boundary and lattice parameter: a increases. Within this paper, from above results exhibit that preparation CuFeO2from Cu and Fe by direct powder dissolved solution method most appropriate for thermoelectric oxide materials due to high active for preparation else high lattice strain and high power factor are 0.00052 and 0.64×10-4W/mK2, respectively.

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ChemInform Abstract: Thermoelectric Properties of Cu_1‐xPt_xFeO₂ (0.0 ≤ x ≤ 0.05) Delafossite‐Type Transition Oxide.

Cited by 2 publications

References 1 publication

Influence of Na Doping on the Thermoelectric Properties of CuAlO<sub>2</sub> Delafossite

Influence of Na Doping on the Thermoelectric Properties of CuAlO<sub>2</sub> Delafossite

Method of High Active Preparation and Electrical Properties of CuFeO<sub>2</sub> Delafossite-Type

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