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Chemistry of Superconductor Materials: Preparation, - download pdf or read online

By C. W. Gardiner, P. Zoller

ISBN-10: 0815512791

ISBN-13: 9780815512790

This thorough evaluate of the chemistry of excessive Tc superconductors offers wide insurance of the structural and artificial solid-state chemistry of oxide superconductors in addition to great reference fabric on characterization tools. Written by means of 27 gurus within the box, the publication fulfills a necessity for a condensed, single-source reference. it is going to be necessary for researchers and for these strange with structural and artificial solid-state chemistry of superconductors.

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Additional resources for Chemistry of Superconductor Materials: Preparation, Chemistry, Characterization and Theory (Materials Science and Process Technology Series)

Sample text

3 K for nearly stoichiometric TiO. In 1978, Roberts presented (11) an addendum to his 1975 data set with the addition (or revision) of 8 new (mostly superconducting) oxides. Metal-rich binary systems (also referred to as metallic sub-oxides), however, exhibited slightly higher transition temperatures than the stoichiometric oxide compounds, but for these interstitials the T, was never any higher than that of the superconducting metal. 02 K. 18 K. As mentioned above in the intermetallic Section, beta-tungsten, which is chemically WsO, is the prototype of the A- 15 structure.

40 Chemistry of Superconductor Materials believed (56) that ferromagnetism (Fe from the crucible) had produced the strong signal, but on further examination, it was concluded that the abrupt change originated from the superconducting oxide (see Figure 14). A broad search for superconductivity in the “tungsten bronze” family was initiated. In many such systems, asuperconducting transition near 1 K was found. The most fruitful members of the “tungsten bronze” family were those possessing a symmetry lower than that of the cubic, and highly non-stoichiometric materials.

Pb and Nb acting as one component of the solid solution. Metallurgists joined the searching party in this endeavor. During the period 1940-1970 many such alloys (intermetallics) were found to be superconductors, but by 1970 the critical temperature had reached a peak value of only 20 K. Figure 3 shows the progress in increasing the transition temperature with new materials as plotted against the year of discovery. The slope of the line corresponds to a 3 degree increase in transition temperature per decade of research.

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Chemistry of Superconductor Materials: Preparation, Chemistry, Characterization and Theory (Materials Science and Process Technology Series) by C. W. Gardiner, P. Zoller


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