Pressure-mediated structural transitions in bulk EuTiO3
D. Bessas (European Synchrotron Radiation Facility, TU Delft - RST/Fundamental Aspects of Materials and Energy)
K. Glazyrin (Deutsches Elektronen-Synchrotron DESY)
D. S. Ellis (RIKEN Center for Emergent Matter Science (CEMS))
I. Kantor (European Synchrotron Radiation Facility)
D. G. Merkel (European Synchrotron Radiation Facility)
V. Cerantola (European Synchrotron Radiation Facility)
V. Potapkin (Universität Münster)
S. Van Smaalen (University of Bayreuth)
A. Q.R. Baron (RIKEN Center for Emergent Matter Science (CEMS))
R. P. Hermann (Oak Ridge National Laboratory)
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Abstract
The high pressure structural phase diagram of EuTiO3 is revisited by means of single crystal x-ray diffraction at pressures below 30GPa. We report a transition at about 3GPa with a surprisingly small lattice distortion. At 23GPa we have detected a yet unknown transition into a new orthorhombic phase (space group Ibam). Combining our observations on structures obtained on single crystals and polycrystalline samples with complementary methods, such as electrical resistivity and nuclear forward scattering of synchrotron radiation measured on polycrystalline samples, we address issues relevant to chemistry and disorder.
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