Structural and electrical properties of nanostructured fluorite-like R2+xTiO5+1.5x (R = Y, Er; 0 <= x <= 1)статья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:We have studied the detailed structure and electrical properties of single-crystal and polycrystalline fluorite-like R2 + x TiO5 + 1.5x (R = Y, Er; 0 a parts per thousand currency sign x a parts per thousand currency sign 1) materials and found the first evidence for the formation of nanodomains a parts per thousand 40-1000 nm in size, which are coherent with the matrix and have various degrees of structural order. The formation of the nanodomains is driven by internal stress. Using impedance spectroscopy, we have determined the electrical conductivity of the materials in air at temperatures from 300 to 1000A degrees C. The 1000A degrees C electrical conductivity of Y2TiO5 (Er2TiO5) and Y2.44TiO5.67 (Er2.44TiO5.67) is 1.86 x 10(-3) (1.35 x 10(-3)) and 9.98 x 10(-4) (8.13 x 10(-4)) S/cm, respectively. The effective activation energy for electrical conduction in Y2TiO5 (Er2TiO5) and Y2.44TiO5.67 (Er2.44TiO5.67) is 1.16 (1.21) and 1.25 (1.21) eV, respectively.