By Terrell A. Vanderah
This thorough assessment of the chemistry of excessive Tc superconductors presents large insurance of the structural and artificial solid-state chemistry of oxide superconductors in addition to gigantic 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 unexpected with structural and artificial solid-state chemistry of superconductors.
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Additional info for Chemistry of Superconductor Materials Preparation, Chemistry, Characterization and Theory
Ordered Perovskite-t_vpe Compounds, A,(BB’)O, Systems: Cubic Fm3m: A feature of the perovskite structure is that, with the proper substitutions, many types of ordered structures can readily be formed. This can be accomplished by the substitution of two suitable metal ions (with different oxidation states) in the octahedral sites of the structure. 8 A unit cell (Figure 15). Partial substitution of different transition metal ions in the octahedral sites is also possible; the general formulation for these compounds would be The parentheses in this formulation enclose atoms A,(B,_,B’,JO,.
This large and important family of intermetallic superconductors, some having the highest T, values known. The A- 15 binary alloys were developed during the sixties and seventies, and can be considered as derived from this “oxide structure” (Figure 5). The structural relationship between the A-15 structure, or CrsSi, and that of WsO will now be given. In the W,O structure, the metal atoms (as a dumbbell of metal atoms on each cubic face) occupy the 6c sites of Space Group Pm3n (# 223), and the oxygen atoms are at the origin (the corners) and also at the center of the cubic unit cell.
This compound can be reduced under thermal treatment in a high vacuum system or under a reducing gas, such as hydrogen. The resulting product is a red crystalline solid, maintaining the same structure but possessing a slightly smaller unit cell. 30 K was observed in SrTi03_X (see Figure 11). Further studies (54) suggested that the T, was dependent on the carrier A plot of the transition temperature versus ne, the concentration. charge carrier concentration, is presented in Figure 12. 8 / ! -zo- I z -4o- I 3 3 -6O- !