Comparative analysis of the twin and heterophase structures in (1?x)Pb(Mg1/3Nb2/3)O3?xPbTiO3 crystals |
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Authors: | V Yu Topolov |
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Institution: | (1) Rostov State University, ul. Zorge 5, Rostov-on-Don, 344090, Russia |
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Abstract: | The specific features of the coexistence of phases in heavily twinned crystals of the (1?x)Pb(Mg1/3Nb2/3)O3?xPbTiO3 system in the vicinity of the morphotropic phase boundary (0.30≤x≤0.40) are investigated. The phase transformations in crystals at x = const during cooling are considered at electric field strengths E=0 and 0.1 MV/m. The conditions of the formation of interphase boundaries (zero net strain planes) are determined for different first-order phase transitions. The results of calculating the tetragonal-monoclinic M C and monoclinic-monoclinic (M C –M A ) phase transitions are represented in the form of “twin state-interphase boundary” diagrams. The effect of a 90° domain (twin) structure of the tetragonal phase on the heterophase state associated with the presence of monoclinic phases is analyzed. |
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