Direct observation of the B-site cationic order in the ferroelectric relaxor Pb(Mg1/3Ta2/3)O-3
By means of transmission electron microscopy (TEM) the structure of chemically ordered regions in Zr-doped Pb(Mg1/3Ta2/3)O-3 has been studied. Large coherent ordered domains were obtained by the addition of 5 mol% PbZrO3. The results obtained by conventional, analytical, and high-resolution TEM are consistent with the random-site description of the B-site order, the so-called random-layer model. Image simulations showed that a careful selection of the imaging conditions for high resolution transmission electron microscopy is necessary in order to determine the different B-site occupancies. By comparison of simulated with experimental images it was possible to directly distinguish between the different ordering models. (C) 2004 American Institute of Physics.
Cantoni, M EPFL, Swiss Fed Inst Technol, Fac Engn, Mat Inst,Ceram Lab, CH-1015 Lausanne, Switzerland EPFL, Swiss Fed Inst Technol, Fac Engn, Mat Inst,Ceram Lab, CH-1015 Lausanne, Switzerland 857VB Times Cited:0 Cited References Count:28
Record created on 2006-08-21, modified on 2016-08-08