SYNTHESIS AND HIGH-PRESSURE STUDY ON CA(1-X)LN(X)SIO(3)

In this paper, for the first time, Ca(1-x)Ln(x)SiO(3) (Ln = Y, La, x = 0.1, 0.2) was synthesized with three methods of high temperature (HT) under atmospheric pressure (AP), high temperature (HT) combined with high pressure (HP) and sol-gel method. The sample obtained at the stab le range of 4.3 - 5.0 GPa pressure and 1050 - 1100 degrees C temperatu re with HT and HP method has a cubit perovskite structure, which has t he minimum lattice parameter of 0.3535 nm so far, the sample with tric linic structure was obtained by sintering at atmosphere, and the sampl e synthesized with sol-gel method has monoclinic structure. SEM analys is shows that rare earth ions take the lattice site of Ca, but the dis tribution of rare earth ions in the samples synthesized with HT and HP is not homogeneous.