A polycrystalline La2/3 (Ca0.60 Ba0.40 ) 1/3 MnO3 was prepared by standard solid reaction method. Magnetization(M) and magnetoresistance of the sample were meas
<正>The surface nanocrystalline microstructures of 7A04 aluminium alloy was obtained by means of circulation rolling plastic deformation(CRPD), the grain refine