Neutron Diffraction And Mossbauer Effect Study On A Mixed Rare Earth Garnet

Abstract

A powder sample of Y^YbFesO,; was prepared using the ceramic technique. X-ray diffraction pattern showed a single phase of the garnet type structure with a lattice constant 12.323 A". Specific heat for this composition was found to change anomously at a transition point 555±5K. Neutron diffraction and Mossbauer effect measurements were obtained over a wide range of temperature (600-4.2K) and supported the existence of a collinear ferrimagnetic spin model below the point down to 4.2K. Curie. Crystallographic, magnetic and hyperfine parameters were determined and discussed.