Structural phase transitions in EuNbO3 perovskite

Yoshiro Kususe, Suguru Yoshida, Koji Fujita, Hirofumi Akamatsu, Masafumi Fukuzumi, Shunsuke Murai, Katsuhisa Tanaka

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The crystal structures of europium niobate, EuNbO3, have been examined over a wide temperature range between 20 and 500 K using synchrotron X-ray diffraction. We have observed two successive structural phase transitions at 360 and 460 K. Below 350 K, EuNbO3 adopts an orthorhombic perovskite structure (space group Imma), which is characterized by NbO6 octahedral tilting about the pseudocubic two-fold axis. The result differs from previous reports in which EuNbO3 was assigned to a cubic aristotype (space group Pm3m) of perovskite at room temperature. At around 360 K, EuNbO3 undergoes a first-order phase transition to a tetragonal symmetry (space group I4/mcm) with the NbO6 octahedral tilting about the pseudocubic four-fold axis. As the temperature is further increased, the I4/mcm tetragonal phase changes into the Pm3m cubic aristotype at 460 K. The tetragonal-to-cubic transformation is characterized as a continuous phase transition.

Original languageEnglish
Pages (from-to)192-199
Number of pages8
JournalJournal of Solid State Chemistry
Volume239
DOIs
Publication statusPublished - Jul 1 2016
Externally publishedYes

Fingerprint

Perovskite
Phase transitions
Europium
niobates
europium
Synchrotrons
Temperature
synchrotrons
Crystal structure
X ray diffraction
crystal structure
temperature
symmetry
room temperature
diffraction
perovskite
x rays

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

Cite this

Kususe, Y., Yoshida, S., Fujita, K., Akamatsu, H., Fukuzumi, M., Murai, S., & Tanaka, K. (2016). Structural phase transitions in EuNbO3 perovskite. Journal of Solid State Chemistry, 239, 192-199. https://doi.org/10.1016/j.jssc.2016.04.032

Structural phase transitions in EuNbO3 perovskite. / Kususe, Yoshiro; Yoshida, Suguru; Fujita, Koji; Akamatsu, Hirofumi; Fukuzumi, Masafumi; Murai, Shunsuke; Tanaka, Katsuhisa.

In: Journal of Solid State Chemistry, Vol. 239, 01.07.2016, p. 192-199.

Research output: Contribution to journalArticle

Kususe, Y, Yoshida, S, Fujita, K, Akamatsu, H, Fukuzumi, M, Murai, S & Tanaka, K 2016, 'Structural phase transitions in EuNbO3 perovskite', Journal of Solid State Chemistry, vol. 239, pp. 192-199. https://doi.org/10.1016/j.jssc.2016.04.032
Kususe, Yoshiro ; Yoshida, Suguru ; Fujita, Koji ; Akamatsu, Hirofumi ; Fukuzumi, Masafumi ; Murai, Shunsuke ; Tanaka, Katsuhisa. / Structural phase transitions in EuNbO3 perovskite. In: Journal of Solid State Chemistry. 2016 ; Vol. 239. pp. 192-199.
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