By C. W. Gardiner, P. Zoller
This thorough overview of the chemistry of excessive Tc superconductors presents wide assurance of the structural and artificial solid-state chemistry of oxide superconductors in addition to massive reference fabric on characterization equipment. Written through 27 experts within the box, the ebook fulfills a necessity for a condensed, single-source reference. it is going to be quintessential for researchers and for these strange with structural and artificial solid-state chemistry of superconductors.
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Extra info for Chemistry of Superconductor Materials: Preparation, Chemistry, Characterization and Theory (Materials Science and Process Technology Series)
Several myths were introduced in the search for new superconductors. It was believed that the intermetallic candidates could only contain metallic elements which were themselves superconducting, and this would exclude those elements such as Cu, Ag, and Pt. Research, however, showed this to be false and now there are several alloy systems which contain the non-superconducting metals. Another misconception was that the new alloy systems could not contain any of the ferromagnetic elements. 8 K) were prepared and found to be superconducting.
For the chemical formulation A,_,BO,, as x increases the symmetry changes from cubic to two different tetragonal phases, to hexagonal, and then finally to much lower symmetry at small values of x. The metallic-conducting properties are also lost in the orthorhombic, monoclinic, and triclinic phases. Superconductivity is normally observed only in tetragonal and hexagonal “tungsten bronze” phases. Tunnels also appear to be necessary for the existence of superconductivity in these compounds (Figure 13).
The slope of the line corresponds to a 3 degree increase in transition temperature per decade of research. In this chapter we will present only an overview of the results obtained on alloy systems through 30 years of research by several groups and many scientists. The results of this research also indicated a relationship between transition temperature and the average number of electrons for the intermetallics. 5 electrons per atom for many binary and ternary alloy systems (Figure 4). A structural relationship was also observed in these superconductors.