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Critical neutron scattering around a superlattice reflection above Tc yields information on the pair correlation function for occupation of lattice sites. The Ornstein-Zernike correlation function e^-κ₁rr is proved to fit the data excellently, and at 8.9^∘{}K above Tc the inverse correlation range κ₁ is found to be 0.0615 ^-1 with an estimated uncertainty of ±{}2%. Correction for instrumental resolution is an essential part of the interpretation of the data and is described in detail.
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Als‐Nielsen et al. (1967) studied this question.
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