Abstract
Substituting B for Co in the strong permanent magnet materials ACo5 (A = Ln orU) substantially modifies the magnetic properties as a function of the B/Co ratio.Preliminary neutron diffraction studies on TbCo3B2 show site-dependentmagnetic moments for both the Tb and the Co atoms. The changing interatomicdistances and magnetic properties with changing B/Co ratio lead to a richmagnetic phase diagram as a function of pressure. It is our intention to studysome of these materials using high-pressure Mössbauer spectroscopy in the future.As a preliminary step it is essential to study the high-pressure crystallographicphase diagram of these materials. This work shows preliminary high-pressurecrystallographic results on UCo3B2 to 42 GPa, indicating a phase transitionaround 6 GPa.
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