Mössbauer Study of the Perovskite Compound RbFeF₃: Magnetic Structure in the Phase below 39 K and Temperature Dependence of Hyperfine Parameters below the Néel Temperature

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The Mössbauer spectroscopy is applied to the perovskite compound RbFeF₃. It is concluded that in the phase realized below T₁ (39 K) the spontaneous magnetization originates in a canting of the spins, i.e. the spins are almost along a pseudo-cubic [011] axis but cant by about 6° from the [011] axis, yielding spontaneous magnetization along a pseudo-cubic [0\bar11] axis. The temperature dependence of the Mössbauer parameters obtained for the three temperature regions below T_N(101 K), T₂(87 K)<T<T_N, T₁<T<T₂, T<T₁, is given.