| Study of periodic lattice distortions in conducting nano to micro clusters near an element X-Ray edge: | |
| Abstract ID | 6 |
| Presenter | Jeffrey F Kmiec |
| Presentation Type | Poster |
| Full Author List | B Shyam, JV Acrivos1 |
| Affiliations | San Jose State University |
| Category | |
| Abstract |
We describe enhanced effects in the XRD scattering of nano cluster conducting materials: Standard LaB6 at 8049eV and 10886eV@2La L3-edge, and cuprate layer conductors near the Cu K-edge. Comparison of intensities, of mutually enhanced reflections by electronic excitations: IEo versus Q(q), and I*Qo,Eo versus E0+DE, when stimulated electrons e*(DE,p*) scattering add momentum p* and energy DE to Bragg aligned, incident photons at {q0,E0}, Q*/Q0 grain boundary (GB) lead to Q*=Q0+p*, obtains with a single Si(111) (WHH<2eV) analyzer crystal at BL21. Results show: (a) an order of magnitude enhancement in the LaB6: O1h I*Qo=(220),10886eV center band, with another order of magnitude increase in the sideband structure, over that observed at 8049, 8980eV near E0@2La L3-edge, and. (b) (Bi1.7Pb0.3Sr2Can-1CunO2n+4+δ)2,n=2-19 alloys’ extended states’ excited e* near the Cu K-edge, when the incident field eQo is in CuO2 plane, identify CuM bonds: Sr:3s is responsible for enhanced I*Qo=(00 16)n=2,8980eV, but Sr:2p1/2 is responsible for I*Qo=(200)n=2,8980eV when eQo is normal to the CuO2 plane. These effects provide insight on nano cluster growth beyond XAS results, that identify the presence/absence of GB in n=2,3,9,15,19 alloys, but their origin still needs better understanding. BL21 scientists expertise B. Johnson, S Mannsfeld, V Borzenets, JR Troxel is gratefully acknowledged. |
| Footnotes | |
| Funding Acknowledgement | |