Anomalous x-ray scattering measurement of near-neighbor individual pair displacements and chemical order in <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">Fe</mi></mrow><mrow><mn>22.5</mn></mrow></msub></mrow></math></span><span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">Ni</mi></mrow><mrow><mn>77.5</mn></mrow></msub></mrow></math></span>

G. E. Ice; C. J. Sparks; A. Habenschuss; L. B. Shaffer

doi:10.1103/PhysRevLett.68.863

Anomalous x-ray scattering measurement of near-neighbor individual pair displacements and chemical order in ${Fe}_{22.5}$ ${Ni}_{77.5}$

G. E. Ice, C. J. Sparks, A. Habenschuss, and L. B. Shaffer

Phys. Rev. Lett. 68, 863 – Published 10 February 1992

Abstract

We demonstrate an anomalous x-ray-diffraction procedure for the determination of pair correlations in crystalline solid solutions. This procedure experimentally removes the large thermal diffuse scattering background with no assumptions and permits separation of chemically specific static displacements. We recover the near-neighbor chemical order and static displacements in a ${Fe}_{22.5}$ ${Ni}_{77.5}$ single crystal quenched from 1000 °C. The Fe-Fe nearest-neighbor distance is dilated by ∼0.043 Å from the average lattice. The possible magnetic origins of this dilation are discussed.