  The structural, electrical transport and magnetic properties of perovskite
oxides La1-xTexMnO3 have been investigated and thus the magnetic phase diagram
of La1-xTexMnO3 compounds as a function of temperature and the doping level x
has been obtained. All samples have rhombohedral structure and undergo
paramagnetic-ferromagnetic (PM-FM) transition accompanied with metal-insulator
transition (MIT). Whereas a charge ordering (CO) transition begins to appear at
for the sample with x=0.60. Moreover, the variation of the Curie temperature
and the MIT temperature is quite complex and the results are discussed in terms
of three factors including the average A-site cation radius <rA>, the size
mismatch and the Te content. In addition, there has an evident
magnetoresistance (MR) at low temperatures for all samples.
