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Author: search.filters.author.Wichainchai, AreeSubject: search.filters.subject.Delafossite

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    Method of high active preparation and electrical properties of CuFeO2 delafossite-type
    (2014-01-01)
    Rudradawong, Chalermpol
    ;
    Wichainchai, Aree
    ;
    Sakulkalavek, Aparporn
    ;
    Hongaromkid, Yuttana
    ;
    Ruttanapun, Chesta
    In this paper, the CuFeO<inf>2</inf> compound 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. 86×10<sup>16</sup> cm<sup>-3</sup> and 494. 96 cm2/V. s, respectively. In addition, each CuFeO<inf>2</inf> compounds were investigated on crystal structure and electrical properties. From XRD and SEM results, all samples have a crystal structure delafossitetype (R3m) and 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 CuFeO<inf>2</inf> from 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<sup>-4</sup> W/mK<sup>2</sup>, respectively. © (2014) Trans Tech Publications, Switzerland.
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    Thermoelectric properties of Cu1-xPtxFeO2 (0.0 ≤ x ≤ 0.05) delafossite-type transition oxide
    (2011-03-31)
    Ruttanapun, Chesta
    ;
    Wichainchai, Aree
    ;
    Prachamon, Wutthisak
    ;
    Yangthaisong, Anucha
    ;
    Charoenphakdee, Anek
    The samples of Cu<inf>1-x</inf>Pt<inf>x</inf>FeO<inf>2</inf> (0 ≤ x ≤ 0.05) delafossite were synthesized by solid state reaction method for studying thermoelectric properties. The properties of Seebeck coefficient, electrical conductivity and thermal conductivity were measured in the high temperature ranging from 300 to 960 K. The results of Seebeck coefficient, electrical conductivity and power factor were increased with increasing Pt substitution and temperature. The thermal conductivity was decreased from 5.8 to 3.5 W/mK with increasing the temperature from 300 to 960 K. An important results, the highest value of power factor and ZT is 2.0 × 10<sup>-4</sup> W/mK<sup>2</sup> and 0.05, respectively, for x = 0.05 at 960 K. © 2011 Elsevier B.V. All rights reserved.