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Phys. Rev. 177, 793. Aharoni, A. (1973). Phys. Rev. B 7, 1103. , and Eisenstein, I. (1975). Phys. Rev. B 11, 514. Amulyavichus, A. , and Suzdalev, I. P. (1973). Zh. Eksp. Teor. Fiz. : Sov. Phys. JETP 37, 859 (1973)]. Ando, K. , and Lindquist, R. H. (1967). J. Phys. Chem. Solids 28, 2291. , and Poix, P. (1976). Phys. Status Solidi (a) 35, 153. , and Ringström, B. (1974). In "Mössbauer Effect Methodology" ( C Seidel and I. J. ), Vol. 9. Plenum Press, New York. , and Wegener, H. (1968). Phys. Status Solidi 29, 781.

9 kG. Similar results have been obtained for small 1 33 Magnetic Microcrystals particles of Fe 3 0 4 (Roggwiller and Kündig, 1973), y-Fe203 (Coey and Khalafalla, 1972); and MgFe204 (Gonser, 1968/69). 0-nm a-Fe 2 0 3 par­ ticles when a magnetic field was applied. Although a-Fe 2 0 3 is antiferromagnetic (with a small canting of the spins above the Morin transition), small particles may still have a magnetic moment due to uncompensated surface spins. This may be the explanation of the observed field depen­ dence.

Below TM, the spins are parallel to the (001) direction, and above TM the spins are perpendicular to this direction (with a small canting angle). This transition gives rise to changes in the sign and magnitude of the quadrupole coupling and in the size of the hyperfine field and is therefore easily observed by using Mössbauer spectroscopy. , 1966). Schroeer and Nininger (1967) found a Morin temperature of 166 ± 10 K in particles with an average diameter of 575 A. The same authors later published a detailed study of the particle size dependence of the Morin transition (Nininger and Schroeer, 1978).

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