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GOIAN, V. KAMBA, S. PACHEROVÁ, O. DRAHOKOUPIL, J. PALATINUS, L. DUŠEK, M. ROHLÍČEK, J. SAVINOV, M. LAUFEK, F. SCHRANZ, W. FUITH, A. KACHLÍK, M. MACA, K. SHKABKO, A. SAGARNA, L. WEIDENKAFF, A. BELIK, A.
Original Title
Antiferrodistortive phase transition in EuTiO3
Type
journal article in Web of Science
Language
English
Original Abstract
X-ray diffraction, dynamical mechanical analysis, and infrared reflectivity studies revealed an antiferrodistortive phase transition in EuTiO3 ceramics. Near 300 K, the perovskite structure changes from cubic Pm3m to tetragonal I4/mcm due to antiphase tilting of oxygen octahedra along the c axis. The phase transition is analogous to SrTiO3. However, some ceramics as well as single crystals of EuTiO3 show different infrared reflectivity spectra bringing evidence of a different crystal structure. In such samples, electron diffraction revealed an incommensurate tetragonal structure with modulation wave vector q =0.38 a. Extra phonons in samples with modulated structure are activated in the IR spectra due to folding of the Brillouin zone. We propose that defects such as Eu3+ and oxygen vacancies strongly influence the temperature of the phase transition to antiferrodistortive phase as well as the tendency to incommensurate modulation in EuTiO3.
Keywords
EuTiO3; phase transition; X-ray diffraction; infrared reflectivity
Authors
GOIAN, V.; KAMBA, S.; PACHEROVÁ, O.; DRAHOKOUPIL, J.; PALATINUS, L.; DUŠEK, M.; ROHLÍČEK, J.; SAVINOV, M.; LAUFEK, F.; SCHRANZ, W.; FUITH, A.; KACHLÍK, M.; MACA, K.; SHKABKO, A.; SAGARNA, L.; WEIDENKAFF, A.; BELIK, A.
RIV year
2012
Released
25. 8. 2012
Publisher
AMER PHYSICAL SOC
Location
ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844
ISBN
1098-0121
Periodical
PHYSICAL REVIEW B
Year of study
86
Number
054112
State
United States of America
Pages from
054112-1
Pages to
054112-9
Pages count
9