By C. W. Gardiner, P. Zoller

This thorough evaluation of the chemistry of excessive Tc superconductors presents vast insurance of the structural and artificial solid-state chemistry of oxide superconductors in addition to enormous reference fabric on characterization tools. Written by means of 27 experts within the box, the ebook fulfills a necessity for a condensed, single-source reference. will probably be fundamental for researchers and for these surprising 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)

Sample text

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). 57 K. It was first Historical Introduction and Crystal Chemistry of Oxide Superconductors 39 Figure 13: Projections of (a) tetragonal(II), and (b) hexagonal “tungsten bronze” structure. A polyhedral representation showing the large pentagonal and hexagonal tunnels, respectively. From Reference 55.

Tetracyanoquinodimethane salt. It was then realized that an electron donor (generating a cation) could be coupled with an electron acceptor (forming an anion) to yield a metallic conducting salt or compound. In most cases the donor, and sometimes the acceptor molecule, was a large planar organic molecule. These charge-transfer products were tested for superconductivity but little success was achieved in obtaining high transition temperatures. A listing of good electron donors and acceptors is presented in Table 6.

This bold statement by two possibly set back oxide superconducting leading research authorities research for several decades. 20 K. 28 K. Such low transition temperatures! What future would there be for oxide superconductors? 28 K), but never transformed into the superconducting state. These oxides can be listed into two broad categories; the metallic-conducting oxides, and the insulating class (which shall include the semiconductors). The first grouping of good metallic conductors that never became superconducting includes: MOO,, PbO,, VO, V,O,, Tl,O,, AgsO, T&O,, ReO,, ReO,, and WO,.

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