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The recent discovery of high-temperature superconductivity in
copper based oxides is an event of major importance not only with
respect to the physical phenomenon itself but also because it
definitely shows that solid state chemistry, and especially the
crystal chemistry of oxides, has a crucial place in the synthesis
and understanding of new materials for future appli cations. The
numerous papers published in the field of high Tc supercon ductors
in the last five years demonstrate that the great complexity of
these materials necessitates a close collaboration between
physicists and solid state chemists. This book is based to a large
extent on our experience of the crystal chemistry of copper oxides,
which we have been studying in the laboratory for more than twelve
years, but it also summarizes the main results which have been
obtained for these compounds in the last five years relating to
their spectacular superconducting properties. We have focused on
the struc ture, chemical bonding and nonstoichiometry of these
materials, bearing in mind that redox reactions are the key to the
optimization of their supercon ducting properties, owing to the
importance of the mixed valence of copper and its Jahn-Teller
effect. We have also drawn on studies of extended defects by
high-resolution electron microscopy and on their creation by ir
radiation effects."
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