The effect of substitution of Gd ions for Ca ions in the Bi1.84Pb0.34Sr1.91(Ca1-xGdx)2.03Cu3.06O10+ (x =0.0∼0.06) was investigated by measuring x-ray diffraction patterns, lattice constants, dc resistivity and Hall effect. We found the solubility li...
The effect of substitution of Gd ions for Ca ions in the Bi1.84Pb0.34Sr1.91(Ca1-xGdx)2.03Cu3.06O10+ (x =0.0∼0.06) was investigated by measuring x-ray diffraction patterns, lattice constants, dc resistivity and Hall effect. We found the solubility limit of Gd in the 110 K phase to be x<0.015. Within the solubility limit, the c-axis seemed to decrease with increasing x. In the region of the 110 K single phase, the critical temperature Tc gradually decreased with an increasing the Gd concentration x, corresponding to a small change of the carrier concentration.