By Albert Prodan, Andrzej Budkowski (auth.), Frank W. Boswell, J. Craig Bennett (eds.)
Modulated crystals were intensively investigated over the last a number of years and it really is now glaring that an realizing in their crystallography and microstructure is key to the elucidation of the actual houses and part transitions in those fabrics. This ebook brings jointly for the 1st time the crystallographic descriptions and experimental equipment for the structural and microstructural research of modulated crystals as defined via recognized researchers within the quite a few parts. The emphasis is on cost density wave modulations, and the precise research of the prototypical NbTe4/TaTe4 method offers functional functions of the tools. Scanning Tunnelling Microscopy is a brand new process supplying major new insights into atomic scale information of the modulations' constructions and a bankruptcy in this approach is included.
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Extra resources for Advances in the Crystallographic and Microstructural Analysis of Charge Density Wave Modulated Crystals
These satellites appear in the diffraction pattern at roughly the same value of c* and at the midpoint between two ql-satellites (Figure 2b). For NbTe4, the peak intensity of the (q2,Q3)-sateliites is also at the commensurate value in a X-ray experiment. 3) is exceeded and then jumps discontinuously to an incommensurate value. 3. Phase Transitions For many modulated structures there is a sequence of phase transitions from a high-symmetry undistorted (high temperature) phase to an incommensurate phase and further to a commensurate (low temperature) phase.
13. R. P. Pouget, in Crystal Chemistry and Properties of Materials with Quasi-One-Dimensional Structures, Ed. J. Rouxel, D. Reidel Pub!. 87. 14. F. Hulliger, in Structural Chemistry of Layered-Type Phases, Ed. F. Levy, D. Reidel Pub!. , Dordrecht, (1976). 15. W. Overhauser, Adv. Phys. 27,343 (1978). 16. A. M. L. Eaglesham, S. McKernan, R. L. Withers, Ultramicroscopy 18, 97 (1985). 17. M. L. Withers, J Phys. C 19,3497 (1986). 18. L. M. Bird, J Phys. C. 19,3507 (1986). 19. V. Coleman, B. K. Hansma, A.
The (3+l)-dimensional X-ray refinement carried out by van Smaalen et al. 691) and a (ao x coJ BS unit cell and the corresponding dualistic description was given as ;44::::~~ . All general conclusions ofB5hm and Von Schnering  regarding different Nb and Te modes as well as the phase difference between neighbouring columns [46,126] were confirmed, except for the nature of the modulation, which was described as IC instead of discommensurate. In addition, Kusz and B5hm  performed a statistical analysis for the RT NbTe4, in which the structural model , obtained by the (3+1)-dimensional refinement was compared with a series of models, which were a result of various COM approximations.
Advances in the Crystallographic and Microstructural Analysis of Charge Density Wave Modulated Crystals by Albert Prodan, Andrzej Budkowski (auth.), Frank W. Boswell, J. Craig Bennett (eds.)