Evidence for MB and MC phases in the morphotropic phase boundary region of (1-x)[Pb(Mg1/3Nb2/3)O3]-xPbTiO3: A Rietveld study
Abstract
We present here the results of the room-temperature dielectric measurements and Rietveld analysis of the powder x-ray diffraction data on (1-x)[Pb(Mg1/3Nb2/3)O3]-xPbTiO3(PMN-xPT) in the composition range 0.20⩽x⩽0.45 to show that the morphotropic phase boundary region contains two monoclinic phases with space groups Cm (or MB type) and Pm (or MC type) stable in the composition ranges 0.27⩽x⩽0.30 and 0.31⩽x⩽0.34, respectively. The structure of PMN-xPT in the composition ranges 0⩽x⩽0.26 and 0.35⩽x⩽1 is found to be rhombohedral (R3m) and tetragonal (P4mm), respectively. These results are compared with the predictions of Vanderbilt & Cohen’s theory.
- Publication:
-
Physical Review B
- Pub Date:
- February 2003
- DOI:
- 10.1103/PhysRevB.67.064102
- arXiv:
- arXiv:cond-mat/0210108
- Bibcode:
- 2003PhRvB..67f4102S
- Keywords:
-
- 77.84.Dy;
- Niobates titanates tantalates PZT ceramics etc.;
- Condensed Matter - Materials Science
- E-Print:
- 20 pages, 11 pdf figures