By Jean Rouxel (auth.), Jean Rouxel (eds.)

There is not any doubt that during the improvement of the Physics and Chemistry of Solids over the past fifteen years, the extremely important position taken via low-dimensional compounds should be remembered as an important occasion. Dealing very greatly at first with two-dimensional buildings and intercalation chemistry, this subject gradually advanced because the synthesis of one-dimensional conductors elevated, in addition to the commentary in their extraordinary homes. past the classical separation of the normal disciplines, crucial growth has stemmed at any time when from the concerted efforts of, and overlapping among, chemists, experimental physicists, and theoreticians. This ebook is a man-made process which goals to retrace those united efforts. The remark and characterization of cost density waves of their static or dynamic elements were the details to draw the curiosity of researchers. large different types of compounds were the fabric foundation of those observa­ tions: transition-metal polychalcogenides and both condensed-cluster stages or bronze-type compounds. those households are noted during the a number of chapters of this booklet, therefore illustrating the continual development of innovations during this area and, even as, offering the 1st artificial and exhaustive view of this crew of materials.

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Additional info for Crystal Chemistry and Properties of Materials with Quasi-One-Dimensional Structures: A Chemical and Physical Synthetic Approach

Example text

1, the band structure of 2 was derived in terms of the unit cell comprising one site and one 44 MYUNG-HWAN WHANGBO orbital. The corresponding band structure is reproduced in Figure 13(a). Without loss of generality, the band structure of 2 may also be calculated by adopting a unit cell of n consecutive sites. Then the repeat distance becomes na, so that the first BZ is given by -a*/2n :0::;; k :0::;; a*/2n. Within this zone, there are n band orbitals since a unit cell consists of n orbitals in such a case.

Delocalized state). The relative stability problem of the metallic and magnetic insulating states is analogous to that of the low-spin and high-spin states of a molecular dimer 55 [2(c), 2(1), 12(a)]. With one electron and one orbital per site, the dimer leads to two molecular orbitals which are separated in energy by 12t I = W/2. The high-spin state 56b becomes more stable than the low-spin state 56a when W is small compared with U. ed· electrons may have a long-range order as in the ferromagnetic state 52 or in the antiferromagnetic state 57.

Phys. C, 91, 4117 (1978). 2. A. Meerschaut, P. Palvadeau, and J. Rouxel, J. Solid State chern. 20, 21 (1977). 3. M. Meerschaut, L. Guemas, R. Berger, and J. Rouxe1, Acta Cryst. 835,1747 (1979). 4. H. G. von Schnering and W. Beckman, Z. Anorg. aUg. Chern. 347, 231 (1966); J. Rijnsdorp, G. J. de Langes, and G. A. Weigers, J. Solid State Chern. 30 (3), 365 (1979). AN APPROACH TO ONE-DIMENSIONAL COMPOUNDS 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29.

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