Structural instability of EuTiO3 from X-ray powder diffraction

J. Köhler; R. Dinnebier; A. Bussmann-Holder

Structural instability of EuTiO3 from X-ray powder diffraction

Materials Science 2012-05-25 v1

Authors: J. Köhler , R. Dinnebier , A. Bussmann-Holder

Abstract

We have recently predicted and subsequently verified experimentally by specific heat measurements that EuTiO3 undergoes a structural phase transition at elevated temperature TS = 282 K. The origin of the phase transition has been attributed to the softening of a transverse acoustic mode stemming from an oxygen octahedral rotation analogous to SrTiO3. Here we demonstrate that the theoretical interpretation is correct by using high resolution laboratory X-ray powder diffraction which evidences a cubic to tetragonal phase transition in EuTiO3. The room temperature structure could be refined in with a = 3.9082(2) {\AA} and at 100 K the refinement in the tetragonal space group resulted in a = 5.5192(2) and c = 7.8164(8) {\AA}.

Keywords

ferroelectric phase transitions crystal growth and phase transitions

Cite

@article{arxiv.1205.5374,
  title  = {Structural instability of EuTiO3 from X-ray powder diffraction},
  author = {J. Köhler and R. Dinnebier and A. Bussmann-Holder},
  journal= {arXiv preprint arXiv:1205.5374},
  year   = {2012}
}

Comments

9 pages, 2 figures

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