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Order-disorder of Pb(Mg1/3Nb2/3)O3 on B-site was studied through both the heat treatment and La+3 -doping methods. It is interpreted that enhance of degree of diffuse phase transition is of a formation of Mg+2/Nb+5 = 1 non-stoichiomatric short-range ordered micro-domains accompanied with segregation of Nb+5in disordered area. It is found that ordered degree, instead of size of ordered microdomain, could be intensified after annealing, however, size enlarged through La+3-doping.
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