1) that unless /?o»lj ^ is a biased estimate of s. As UQ decreases toward unity there is a tendency for r to overestimate s. Fluctuations whose effect is to make r greater than s are more likely than those with the contrary effect. This tendency was noted by Cranshaw et al.,^^ who suggested the expression r[l -•l/(2/?o)]^^^ as an approximation for (s). For k^ values down to 1.5 the approximation is fairly good. Below that it breaks down because of an opposite tendency: For k^^ 0.5, r tends to imderestimate s. Such values of k^ imply amplitude values so small as to be reckoned unlikely even if s were zerOo The amplitude is deviant no matter what one assumes regarding s. Hence such a result has no power to discriminate against s values that are sufficiently small.
Using the Mössbauer technique, we have measured the electric quadrupole and magnetic dipole hyperfine interaction of 61Ni in NiCr2O4. The magnetic transition temperature and the saturation magnetic hyperfine field were determined to be 69±2 K and 442±3 kOe, respectively. The temperature dependence of the reduced field can be reproduced by a Brillouin function with S=1. With the onset of the magnetic ordering, the electric quadrupole interaction parameter changes by a factor of about −2, which indicates that the spin of the Ni2+ ion is parallel to the [a,b] plane of the crystal.
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