New high-pressure phase of HfTiO4 and ZrTiO4 ceramics

Daniel Errandonea; David Santamaria-Perez; Tatiana Bondarenko; Oleg Khyzhun

doi:10.1016/j.materresbull.2010.06.061

New high-pressure phase of HfTiO4 and ZrTiO4 ceramics

Materials Science 2010-09-23 v1 Other Condensed Matter

Authors: Daniel Errandonea , David Santamaria-Perez , Tatiana Bondarenko , Oleg Khyzhun

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Abstract

We studied the high-pressure effects on the crystalline structure of monoclinic HfTiO4 and ZrTiO4. We found that the compressibility of these ceramics is highly non-isotropic, being the b-axis the most compressible one. In addition, the a-axis is found to have a small and negative compressibility. At 2.7 GPa (10.7 GPa) we discovered the onset of an structural phase transition in HfTiO4 (ZrTiO4), coexisting the low- and high-pressure phases in a broad pressure range. The new high-pressure phase has a monoclinic structure which involves an increase in the Ti-O coordination and a collapse of the cell volume. The equation of state for the low-pressure phase is also determined.

Keywords

high-pressure phase HfTiO4 ZrTiO4 ceramics compressibility structural phase transition equation of state

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@article{arxiv.1008.4675,
  title  = {New high-pressure phase of HfTiO4 and ZrTiO4 ceramics},
  author = {Daniel Errandonea and David Santamaria-Perez and Tatiana Bondarenko and Oleg Khyzhun},
  journal= {arXiv preprint arXiv:1008.4675},
  year   = {2010}
}

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16 pages, 5 figures, 26 references, Article in Press

New high-pressure phase of HfTiO4 and ZrTiO4 ceramics

Abstract

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