China Advanced Research Reactor (CARR) is a 60 MW tank-in-pool inverse neutron trap type reactor at CIAE. In order to use the non-destructive analytical techniques for phase specific residual stresses research, the new materials science diffractometer RSD was designed at CARR, which is one of the first commissioned instruments to meet the demand of industrial applications. The system comprises two types of monochromator, mosaic flat copper (220) and perfect double focusing silicon (311). The take-off angle of monochromator could change continuously from 41 to 109 degree. Therefore the neutron wavelength varies from 0.895 and 2.666 angstrom. The detector is a one dimension position sensitive detector. Various affiliated equipments enable it to do texture and tensional experiments. The best resolution could reach 0.2% using double focusing Si (311) monochromator. When RSD is available for routine operation, some research work in the field of nuclear industrial and aviatic engineering materials will be carried out using the beam of CARR.

PrFe4P12shows an anomalously phase transition from a heavy fermion (HF) state to a non-magnetic ordered state. We prepared single crystal sample of Pr (Fe1-xCox)4P12by Sn-flux method to investigate the effects of electron doping. The distinct change of magnetic property was observed. The phase transition of PrFe4P12rapidly disappears when doped rate x=0.03. This result indicates that the d-electron plays an important role in formation of Low-temperutre phase and HF state of PrFe4P12.

Small Angle Neutron Scattering (SANS) technique allows characterizing the nanomicrostructure of the ferritic Oxide Dispersion Strengthened (ODS) steels which are candidates for the structure material of fusion reactor and fast reactor. A SANS study of domestic ferritic ODS alloys are presented. The main objective is to study the evolution of the oxide dispersion nanoparticle during the different stages of the fabrication and different content.

Bi0.9Pr0.1Fe1-xTixO3 ceramics were prepared by a rapid liquid sintering method. The structure of samples was confirmed by X-ray diffraction and scanning electron microscopy. Ti substitution leads to some changes in the crystal structure of Bi0.9Pr0.1FeO3, which also significantly affects the dielectric constant and loss.

In order to make best use of the neutron flux, a polarized neutron reflectometry with vertical sample geometry is simulated by Vitess package based on Monte Carlo method. The results prove that the neutron flux gain up to a factor reaches 4.3 and the vertical neutron angle divergence is proved, when the optimal tilting angle of the vertically focusing geranium monochromator is 1.3°. At last the optimal separations of horizontal blades of slit packages are optimized. The parameters can be an instruction for polarized neutron reflectometry construction or project analysis in the future.