Abstract

Diffuse scattering of electrons from local order of defects in vanadium monoxide of composition VO1.23 has been studied above the ordering temperature. Intensity expressions for short-range-order scattering involving defects of more than one kind are derived, both for the kinematical case and with Bragg scattering effects included. The interpretation is based upon comparison between experimental and calculated distributions in intensity space and vector space, mainly in projections where Bragg scattering effects are small or moderate. The scattering can be interpreted in terms of defect clusters consisting of one metal interstitial surrounded by four metal vacancies, as in the ordered structure V52O64. The local arrangement of clusters is different from that found in the ordered phase, however.

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