Crystal structure and thermal expansion behavior of oxygen stoichiometric lanthanum strontium manganite at high temperature

Yoshikazu Shirai, Shin Ichi Hashimoto, Kazuhisa Sato, Keiji Yashiro, Koji Amezawa, Junichiro Mizusaki, Tatsuya Kawada

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

In this study, the crystal structures and the thermal expansibilities of La1 - xSrxMnO3 + δ (LSM) with oxygen stoichiometric composition, δ = 0, were studied by an atmosphere and temperature controlled X-Ray diffractometer (XRD). Pre-heat-treatment conditions for the samples and oxygen partial pressures for XRD measurements at high temperature were carefully selected to keep oxygen stoichiometric composition. The crystal structures of La1 - xSrxMnO3 at room temperature were rhombohedral, tetragonal, and cubic symmetry for 0.2 ≤ x ≤ 0.45, 0.5 ≤ x ≤ 0.6, x = 0.7, respectively. The second order phase transition from rhombohedral to cubic symmetry was confirmed for x = 0.4 compound at 923-973 K. Meanwhile, the second order phase transition from tetragonal to cubic symmetry was confirmed for x = 0.5 compound at 623-673 K, x = 0.6 compound at 423-473 K, respectively. Furthermore, the pure thermal expansibilities of LSM without chemical expansion were discussed based on XRD analysis.

Original languageEnglish
Pages (from-to)83-88
Number of pages6
JournalSolid State Ionics
Volume256
DOIs
Publication statusPublished - 2014 Mar 1

Keywords

  • Cathode
  • LSM
  • Lattice parameter
  • Phase transition
  • SOFC
  • Thermal expansion

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Fingerprint

Dive into the research topics of 'Crystal structure and thermal expansion behavior of oxygen stoichiometric lanthanum strontium manganite at high temperature'. Together they form a unique fingerprint.

Cite this