A 58 Animitsa, I. E. Structure and Electrical Properties of Oxygen-Deficient Strontium Copper Niobate / I. E. Animitsa, E. N. Dogodaeva, E. V. Zabolotskaya // Russian Journal of Inorganic Chemistry. - 2010. - Vol. 55, № 2. - P254-260 : il. - Bibliogr. : p. 260 (15 ref.) Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): ПРОТОННЫЙ ПЕРЕНОС -- НИОБАТЫ -- СТРОНЦИЙ Аннотация: The transport properties of Sr5.66Cu0.14Nb2.20O11.30 double perovskite, which enters the homogeneity region of (Sr1 – yCuy)6 – 2xNb2 + 2xO11 + 3x solid solution, are concerned. The total conductivity is differentiated into terms over wide ranges of temperatures and oxygen partial pressure pO2 in dry and humid atmospheres. When pO2 is low or high, a test sample has dominant electron transport of n- or p-type, respectively. In air (pO2 = 0.21 atm), the p-type electron conductivity term increases with temperature elevation. In a humid atmosphere ( pH2O= 0.02 atm), a sample is capable of a reversible incorporation of water occlusion from the gas phase; as a result, some proton conductivity term appears and ion transference numbers increase over a wide range of pO2 values Полный текст |
H 99 Hydration and Proton Transport in Solid Solutions Based on Ba2CaWO6 / I. E. Animitsa, N. A. Kochetova, T. A. Denisova, N. A. Zhuravlev, I. V. Baklanova // Russian Journal of Physical Chemistry A. - 2009. - Vol. 83, № 2. - P197-202 : il. - Bibliogr. : p. 201 (12 ref.) Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): ГИДРАТАЦИЯ -- ПРОТОННЫЙ ПЕРЕНОС -- ТВЕРДЫЕ РАСТВОРЫ -- ВОЛЬФРАМАТЫ ЩЕЛОЧНОЗЕМЕЛЬНЫХ МЕТАЛЛОВ Аннотация: Hydrated alkaline-earth metal tungstates Ba4Ca2 +xW2 –xO12 – 2x with perovskite structure were studied by the thermogravimetry, 1H NMR, IR, and Raman spectroscopy methods. Electrical conductivity and transfer numbers were measured with varying T, Po2, and PH2O. The solid solutions are capable of reversibly intercalating water and can exhibit high-temperature proton transport. The localization of protons on oxygen results in the appearance of energetically nonequivalent OH groups; a small fraction of protons are present in the form of H2O and H3O+ Полный текст |