By Julius Stieglitz

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Extra info for A Theory of Color Production II, Inorganic Compounds

Sample text

35] in this system is Y2CU2 Os. 36]. 49A) contains eight distorted YOs octahedra and eight distorted Cu04 square planar groups. 25. Each YOs octahedron shares an edge with two of its neighbors and a corner with the other six, while the edge- and corner-sharing Cu04 groups form infinite chains running along a. 19] in a nitrogen flow at 1I00°C, and the Cu(III) oxide YCu03 , which was obtained under a high oxygen pressure (4·I07Pa). The structure of those three compounds has so far not been determined.

51 3. 2, only those whose structure is either an oxygen-deficient perovskite, or an intergrowth of the rock-salttype structure and the perovskite structure, present various electron transport properties leading to semiconducting, metallic or superconducting behavior. These properties are due to copper, which exhibits a mixed valence in these oxides that seems to be enhanced by the localization of copper in the perovskite parts of the structures. In this chapter we focus our attention on the electron transport properties of cuprates whose structures are related to the perovskite structure, whether they are superconductors or not.

3. 28]. 20 and annealed in oxygen are superconducting, with Tc ranging from 20 to 38 K. 2), which were then studied by electron diffraction. 3. 10. The X-ray patterns very similar to that of La2Cu04 were indexed in an orthorhombic cell with aI ~ v'2:L ~ aLa2 CuO 4 , b I ~ -p v'2ap ~ b La2 cu04 and c ~ cLa2 cu04 . 1 0 ~ x < 1. The symmetry is tetragonal; the cell parameters are related to those of LaSrCu04 and to I in the following manner: all ~ adv'2 ~ ~ ~ aLaSrCu04 ' cII - cI - cLaSrcuo4 . 34.

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