By Professor Dr. Bernard Raveau, Professor Dr. Claude Michel, Professor Dr. Maryvonne Hervieu, Professor Dr. Daniel Groult (auth.)
The fresh discovery of high-temperature superconductivity in copper established oxides is an occasion of significant value not just with appreciate to the actual phenomenon itself but in addition since it certainly indicates that good nation chemistry, and particularly the crystal chemistry of oxides, has a vital position within the synthesis and knowing of latest fabrics for destiny appli cations. the varied papers released within the box of excessive Tc supercon ductors within the final 5 years show that the nice complexity of those fabrics necessitates an in depth collaboration among physicists and stable nation chemists. This booklet is predicated to a wide volume on our event of the crystal chemistry of copper oxides, which we've got been learning within the laboratory for greater than twelve years, however it additionally summarizes the most effects which were received for those compounds within the final 5 years on the subject of their dazzling superconducting houses. now we have thinking about the struc ture, chemical bonding and nonstoichiometry of those fabrics, taking into account that redox reactions are the most important to the optimization in their supercon ducting homes, because of the significance of the combined valence of copper and its Jahn-Teller impression. we've additionally drawn on reviews of prolonged defects via high-resolution electron microscopy and on their production by way of ir radiation effects.
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Extra resources for Crystal Chemistry of High-Tc Superconducting Copper Oxides
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.