High-pressure x-ray diffraction study of bulk and nanocrystalline PbMoO4

Details High-pressure x-ray diffraction study of bulk and nanocrystalline PbMoO4 High-pressure x-ray diffraction study of bulk and nanocrystalline PbMoO4

2010-10-11

arxiv.org/abs/1010.2028v1

JOURNAL OF APPLIED PHYSICS 108, 073518 (2010)

Physics

Condensed Matter

Materials Science

18 pages, 4 figures

Scientific paper

10.1063/1.3493048

We studied the effects of high-pressure on the crystalline structure of bulk and nanocrystalline scheelite-type PbMoO4. We found that in both cases the compressibility of the materials is highly non-isotropic, being the c-axis the most compressible one. We also observed that the volume compressibility of nanocrystals becomes higher that the bulk one at 5 GPa. In addition, at 10.7(8) GPa we observed the onset of an structural phase transition in bulk PbMoO4. The high-pressure phase has a monoclinic structure similar to M-fergusonite. The transition is reversible and not volume change is detected between the low- and high-pressure phases. No additional structural changes or evidence of decomposition are found up to 21.1 GPa. In contrast nanocrystalline PbMoO4 remains in the scheelite structure at least up to 16.1 GPa. Finally, the equation of state for bulk and nanocrystalline PbMoO4 are also determined.

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