Preparation and general physical properties of polycrystalline PrBa2Cu3O7-y obtained from sol-gel precursors

Abstract

~ 11.88 Å. Oxygenated PrBa2Cu3O7-y samples were found to have an orthorhombic structure with lattice parameter c ranging from 11.72 to 11.75 Å. Electrical resistivity rho(T) measurements performed on these compounds revealed a semiconductor-like behavior in the temperature range 77 <= T <= 300 K. The magnetic susceptibility chi(T) data showed a paramagnetic-like behavior from 5 to 300 K and a clear contribution of the crystalline electrical field (CEF) below 150 K. We have also found an antiferromagnetic ordering associated with the Pr sub-lattice at T N 17 K. Evidence of super-conductivity was not observed on our samples, in agreement with most of the results reported in the literature.]]>

EFFECT OF PARTICLE SIZE OF BaFe₁₂O₁₉ ON THE MICROWAVE ABSORPTION CHARACTERISTICS IN X-BAND

“…XRD analysis reveals that lattice parameters and crystallite size increases with the increasing annealing time. Similar trend is also reported by Meza et al [19]. This may be explained as more oxygen atoms are absorbed by the hexaferrite structure with the increasing annealing time.…”

The Influence of Sintering Temperature and Mn-Ti Doped BaFe₁₂O₁₉ on the Microwave Absorbing Properties

“…It is well known that if Fe or Ba ions is substituted with Co-Ti, Zn-Ti, Zn-Sn, Co-Sn, Ni-Zr and Co-Mo, the saturation magnetization, coercivity, anisotropy constant and ferromagnetic resonant frequency of barium ferrite could be improved [13][14][15][16]. This is one of the serious constraints in an absorbing material, therefore, the relationship between the ferromagnetic resonant frequency of barium ferrite and the substitution elements requires further research [12].…”