  Neutron diffraction, polarized neutron transmission, and small angle neutron
scattering have been used to investigate the crystal structure and nature of
the magnetic order in a polycrystalline sample of RuSr2Eu1.2Ce0.8Cu2O10. The
sample was made with the Eu-153 (98.8%) isotope to reduce the high neutron
absorption for the naturally occurring element. Full refinements of the crystal
structure, space group I4/mmm, are reported. At low temperatures only a single
magnetic peak is clearly observed in a relatively wide angular range. A sharp
spin reorientation transition (SRT) is observed around 35 K, close to the
superconducting transition temperature (Tc~40 K). Between the spin
reorientation temperature and the Neel temperature of 59 K, additional magnetic
reflections are observed. However, none of these can be simply indexed on the
chemical unit cell, either as commensurate peaks or simple incommensurate
magnetism, and the paucity of reflections at low T compels the conclusion that
these magnetic Bragg peaks arise from an impurity phase. X-ray and neutron
diffraction on the pressed pellet both show that the sample does not appear to
contain substantial impurity phases, but it turns out that the magnetic
impurity peaks exhibit strong preferred orientation with respect to the pellet
orientation, while the primary phase does not. We have been unable to observe
any magnetic order that can be identified with the ruthenate-cuprate system.
