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   I-70


    Investigation of the structural and electrical properties of Co-doped BaCe0.9Gd0.1O3 - дельта [] / D. Medvedev, V. Maragou, T. Zhuravleva, A. Demin, E. Gorbova, P. Tsiakaras // Solid State Ionics. - 2011. - Vol. 182, № 1. - С. 41-46. - Bibliogr. : p. 45-46 (43 ref.) . - ISSN 0167-2738

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ОКСИД КОБАЛЬТА -- ЦЕРАТ БАРИЯ -- ПРОТОННЫЕ ПРОВОДНИКИ -- ДОПИРОВАНИЕ
Аннотация: In the present work the effect of cobalt oxide addition on the density and on the electrical properties of gadolinium-doped barium cerate is investigated. A series of BaCe0.9 б xGd0.1CoxO3 б б (x = 0.00, 0.01, 0.03, 0.05, 0.07, 0.10) samples were prepared according to the conventional solid state reaction synthesis technique. The experimental results indicated that the addition of cobalt oxide leads to the improvement of the sintering properties and the enhancement of the grain dimensions. It was found that the investigated complex oxides crystallize at cubic singony. Moreover, according to the X-ray diffraction (XRD) and the scanning electron microscopy (SEM) analyses, the prepared samples are single-phase in the range of 0.00 x б 0.10, while at compositions of x б 0.03 there is almost no open porosity. According to the four-probe dc electrical conductivity measurements, the conductivity of the BaCe0.9 б xGd0.1CoxO3 б б samples is inferior to the undoped ones (BaCe0.9Gd0.1O3 б б—BCG) in wet air atmosphere. However, the presence of Co in the range of 0.03 б x б 0.10 at higher temperatures (800–900 °C) has smaller impact on the electrical conductivity values. Finally, in wet hydrogen atmosphere the electrical conductivity values of the 1 mol% Co-doped sample were found to be close enough to the ones of the undoped sample, leading to the conclusion that cobalt can be effectively employed as a sintering additive of gadolinium-doped barium cerates.

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   L 81


    Lithium-cation conductivity and crystal structure of lithium diphosphate / V. I. Voronin, E. A. Sherstobitova, V. A. Blatov, G.Sh. Shekhtman // Journal of Solid State Chemistry. - 2014. - Vol. 11. - P170-175

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
НЕЙТРОНОГРАФИЯ -- ТВЕРДЫЕ ЭЛЕКТРОЛИТЫ -- ЛИТИЙ ДИФОСФАТ
Аннотация: The electrical conductivity of lithium diphosphate Li4P2O7 has been measured and jump-like increasing of ionic conductivity at 913 K has been found. The crystal structure of Li4P2O7 has been refined using high temperature neutron diffraction at 300–1050 K. At 913 K low temperature triclinic form of Li4P2O7 transforms into high temperature monoclinic one, space group P21/n, a=8.8261(4) Å, b=5.2028(4) Å, c=13.3119(2) Å, β=104.372(6)°. The migration maps of Li+ cations based on experimental data implemented into program package TOPOS have been explored. It was found that lithium cations in both low- and high temperature forms of Li4P2O7 migrate in three dimensions. Cross sections of the migrations channels extend as the temperature rises, but at the phase transition point have a sharp growth showing a strong “crystal structure – ion conductivity” correlation.

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