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제122회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Precursor-assisted synthesis and electrical property of complex perovskites La3Ni2MO9(M = Nb, Ta)

2018년 8월 30일 16시 50분 46초
MAT.P-473 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 18일 (목요일) 11:00~12:30
Material Chemistry
저자 및
Hanseul Kim, Young-il Kim*
Department of Chemistry, Yeungnam University, Korea
Double perovskites, La3Ni2MO9(M = Nb, Ta) were prepared by solid-state reaction between NiO and the respective oxide La3MO7. Compared with the conventional route using binary reactants, the present method provides improvements in the phase-purity as well as the synthesis time. Both La3Ni2MO9 were crystallized in a monoclinic symmetry (P21/n), with a rock-salt type complete ordering of Ni and Ni0.33Ta0.67 on the perovskite B-site. The transport property of La3Ni2MO9 was examined by 2-probe impedance spectroscopy using = 80 % dense specimens. The two La3Ni2MO9 compounds, without a significant difference depending on the type M, showed Arrhenius-like temperature dependence over 144-420 K, where the conductivity ranged between 10-7 to 10-2S/cm with activation energies of = 0.22 eV. It was notable that the present conductivity values are lower than previous literature data by about two orders of magnitude. It is conjectured that the synthesis of La3Ni2MO9 can suffer from a compositional deviation to La3Ni2+xM1-xO9, in which case, electrical conductivity should be affected by the occurrence of Ni3+.