β Scribed by S.V Cherepanova; S.V Tsybulya
No coin nor oath required. For personal study only.
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Title ofprogram: XFIT Nature ofphysical problem A structure hypothesis relative to a powder, a polycrystalline or Catalogue number: ACKY a glassy material can be tested by comparison between the experimental X-ray powder pattern and a calculated one. Program obtainable from: CPC Program Library, Que
Low-temperature X-ray diffraction experiments revealed the existence of two low-temperature phases of Ag,NbS,, phase II (between about 280 and 140 K) and phase III (between about 140 and 10 K). The powder pattern of the phase II measured at 245 K could be indexed on the basis of monoclinic unit cell
## Abstract Leastβsquare refinement of xβray powder diffraction patterns analyzed by the Rietveld method can yield structural information which had been unattainable or at least elaborate to obtain by conventional pattern analysis. The Rietveld method calculates a powder pattern on the basis of a s