| | 1 | Author
| Uwe Hoppe3, Günter Walter8, Dörte Stachelb, AlexC. Hannonc | Requires cookie* | | | Title
| S  | | | | Abstract
| h o r t-R a n g e O r d e r D e ta ils o f M e ta p h o s p h a te G la s s e s S tu d ie d b y P u ls e d N e u tr o n S c a tte r in g Details of the short-range order of the binary metaphosphate glasses A1P30 9 and PbP2Oe and the ternary glass system ZnO-MgO-2P2Os have been studied by pulsed neutron scattering which provides a measuring range up to about ß m ax = 500 nm-1. The splitting of the P-O peak in the distance correlation functions attributable to the different bond lengths for the non-bridging and bridging oxygens was found to decrease with increasing field strength of the network-modifier cations. For the ternary system ZnO-MgO-2P2Os the peak in the distance correlation function, T(r), produced by the first oxygen neighbours around Zn2+ and Mg2+ was separated by the additional use of the X-ray structure factor. The distances rZn0 and rM gQ extracted from the separated peaks are slightly different from those obtained from the binary glasses ZnP20 6 and MgP20 6. The metal-oxygen coordination numbers were found to be NZn0=4.5 and NM g0 = 5.5. For the two binary systems the coordination numbers Al-0 and Pb-0 were obtained to be 7 and 5, respectively. | | | |
Reference
| Z. Naturforsch. 50a, 684—692 (1995); received March 6 1995 | | | |
Published
| 1995 | | | |
Keywords
| Pulsed neutron scattering, phosphate glasses, short-range order | | | |
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| default:Reihe_A/50/ZNA-1995-50a-0684.pdf | | | | Identifier
| ZNA-1995-50a-0684 | | | | Volume
| 50 | |
| 2 | Author
| E. Sváb, F. Hajdu, Gy Mészáros | Requires cookie* | | | Title
| S | | | | Abstract
| e m i-E m p iric a l F ittin g o f P a r t i a l P a i r C o r r e la tio n F u n c tio n s o f A m o rp h o u s A llo y s A semi-empirical fitting procedure has been developed and used in analysing the characteristic features of the partial structure factors of binary amorphous alloys. An analytical formula is given to fit the experimental atomic pair correlation function as a sum of Gaussians. The inverse Fourier transform of the fitted terms reproduces all features of the experimental structure function. In addition to the structural parameters, the modelling gives a quantitative explanation for the complex origin of characteristic features in the diffraction pattern such as pre-peak, pre-minimum, and split peaks in the partial structure factor. | | | |
Reference
| Z. Naturforsch. 50a, 1205—1210 (1995); received September 22 1995 | | | |
Published
| 1995 | | | |
Keywords
| Metallic glass, Short range order, Partial correlations, Neutron diffraction, Fitting | | | |
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| default:Reihe_A/50/ZNA-1995-50a-1205.pdf | | | | Identifier
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