Author/Authors :
Xia، نويسنده , , Z.C and Yuan، نويسنده , , S.L and Tu، نويسنده , , F and Tang، نويسنده , , C.Q. and Liu، نويسنده , , S and Peng، نويسنده , , G and Zhang، نويسنده , , G.Q. and Liu، نويسنده , , L and Liu، نويسنده , , J and Li، نويسنده , , Z.Y. and Yang، نويسنده , , Y.P. and Xiong، نويسنده , , C.S، نويسنده ,
Abstract :
The electrical transport properties of the composite samples: A-site stoichiometry (1−x)La2/3Ca1/3MnO3+xYSZ and A-site deficiency (1−x)(La2/3Ca1/3)0.95MnO3+xYSZ with different YSZ percentage x were investigated, respectively. The similar metal–insulator transition at different temperature TP was observed in the two types of composite samples: With increasing of the YSZ percentage, the zero-field resistivity of the composite samples increases and TP shifts to the low temperature for the range of x<2%, but zero-field resistivity decreases and TP increases for the range of x>2%. For the same YSZ percentage x, TP of (1−x)La2/3Ca1/3MnO3+xYSZ is lower than that of (1−x)(La2/3Ca1/3)0.95MnO3+xYSZ. The different effects between the two type composites were also observed in the nonlinear current–voltage (I–V) behaviors. The results suggest that A-site deficiency and YSZ dopant can be used to adjust purposely the metal–insulator transition temperature and resistivity of composites.
Keywords :
A. Composites , A. Oxides , D. Magnetic properties , D. Electrical properties
