Abstract
The magnetic structure of TbAlO3 single crystals has been studied using zero-field neutron polarimetry and neutron integrated intensity measurements. The results of neither kind of measurements could be understood using a simple model for extinction in the rather good untwinned crystals that were used. To explain the results the Becker–Coppens extinction model [Becker & Coppens (1974). Acta Cryst. A30, 129–147] has been extended to the case where several magnetic domains occur within one block of the nuclear structure. The consequences for both the integrated intensities and the scattered polarizations have been calculated and it has been shown that the model provides a consistent interpretation of both sets of measurements. The results for the magnetic structure are in good agreement with a previous powder diffraction study.
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