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Figure 5
Phase fraction results from the mixed phase Rietveld refinements for the sample in the BNTxBT1–x system, with (a), (b) and (c) corresponding to the unconstrained, parametric and weighted parametric Rietveld refinements, respectively. In (a) the refinement was conducted with no constraints to the lattice parameters or scale factor and would indicate that the entire gradient is mixed phase. In (b) the lattice parameters were constrained by a parametric refinement, which begins to show some separation between the three-phase regions along the gradient. However, each region does not reach 100%, which makes the boundaries unclear. In (c) the restraints to the scale factor were introduced and this shows clear separation between the three phases.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 26| Part 5| September 2019| Pages 1638-1643
https://doi.org/10.1107/S1600577519007902
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