Publication detail

Antiferrodistortive phase transition in EuTiO3

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