Abstract
Occurrence of the MB-type monoclinic phase induced by the lattice distortion of the rhombohedral structure was evidenced by means of high-resolution x-ray powder diffraction, simplified integrate-breadth analysis and Rietveld refinement in the (1-x)- Pb(Mg1/3Nb2/3)O 3-xPbTiO3(PMN-xPT) ceramics with 15%≤x≤30%. The obvious distortion of lattice along [00h]Cwas observed in the composition range 23%≤x≤30%, and increased with the Ti content. Rietveld refinements indicate that the MB-type monoclinic phase exists in the composition range 23%≤x≤25%, and coexists, as a majority phase, with the MC-type monoclinic phase for 26%≤x≤30%. The rhombohedral (R) phase is stable in the composition range of 15%≤x < 23%. The effect of Ti on the lattice distortion and phase stability in the PMN-PT solid solution is discussed based on the model of competition between rhombohedral and tetragonal polar orders.
Original language | English |
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Pages (from-to) | 71-80 |
Number of pages | 10 |
Journal | Ferroelectrics |
Volume | 313 |
DOIs | |
Publication status | Published - 2005 |
Externally published | Yes |
Keywords
- Lattice distortion
- Pb(Mg Nb )O -PbTiO
- Phase transition
- X-ray diffraction