By Professor Dr. Bernard Raveau, Professor Dr. Claude Michel, Professor Dr. Maryvonne Hervieu, Professor Dr. Daniel Groult (auth.)
The contemporary discovery of high-temperature superconductivity in copper established oxides is an occasion of significant significance not just with appreciate to the actual phenomenon itself but in addition since it certainly exhibits that stable nation chemistry, and particularly the crystal chemistry of oxides, has an important position within the synthesis and realizing of recent fabrics for destiny appli cations. the various papers released within the box of excessive Tc supercon ductors within the final 5 years show that the good complexity of those fabrics necessitates an in depth collaboration among physicists and strong kingdom chemists. This booklet relies to a wide quantity on our adventure of the crystal chemistry of copper oxides, which now we have been learning within the laboratory for greater than twelve years, however it additionally summarizes the most effects which were received for those compounds within the final 5 years with regards to their awesome superconducting houses. we now have involved in the struc ture, chemical bonding and nonstoichiometry of those fabrics, considering that redox reactions are the most important to the optimization in their supercon ducting homes, as a result of the significance of the combined valence of copper and its Jahn-Teller impression. we have now additionally drawn on reports of prolonged defects by means of high-resolution electron microscopy and on their production by means of ir radiation effects.
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Extra info for Crystal Chemistry of High-Tc Superconducting Copper Oxides
A) Schematic representation of twin orientations I and II in direct space (projection along e). (b) Diffraction pattern constructed from the ED results. (e) Diffraction pattern for bulk samples as seen in X-ray diffraction experiments. 1 ,,' / ,, X'; I:~" ' ~ 0100 000 I bl 100 7 8 :r atalr. :~:~----~~-o-=-=t=-::7'~:-- ala tr. 42. YBa2Cu307 _6' orthorhombic 90 K superconductor. 43 . YDa 2 CU3 7 - 6 , orthorhombic 90 K superconductor. Precession photograph , hkO plane. 44. YBa z CU 3 7 - 6 , orthorhombic 90 K superconductor.
It seems interesting to take Cu(lI) compounds as a reference (dotted line). 35 a continuous decrease of a and c parameters could be predicted for all Cu(lI) compounds, as x increases, in agreement with the increase of oxygen vacancies. The evolution is not linear, probably due to ordering of the vacancies observed for different compositions. What is worth noting is the large deviation from this law observed only for the compounds containing Cu(III) (continuous line): the c parameter is greater than that obtained from the "reference line" corresponding to the presence of Cu(II) only, while the a parameter is smaller.
3 (Tl) and YBaa CUa Os (T2)] suggested that a complete possible range of nonstoichiometry YBaaCua07_6 with 0 :S 6 :S I could exist. 3). 6). 52]. 599A). Such a metastable oxide can only be prepared by ceramic techniques using a wet medium for grinding and heating in an oxygen flow at temperatures ranging between 850 and 930 C. As for the other two tetragonal forms, no superconductivity was detected. 36) along c. In fact the HREM study of this phase shows that its structure is more complex. One observes microdomains oriented at 90 0 resulting from the lack of mismatch between a and c (c is rigorously equal to 3a).
Crystal Chemistry of High-Tc Superconducting Copper Oxides by Professor Dr. Bernard Raveau, Professor Dr. Claude Michel, Professor Dr. Maryvonne Hervieu, Professor Dr. Daniel Groult (auth.)
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