Thermal Expansion of the Orthorhombic Phase in the Ln2TiO5 System

Kevin C. Seymour, Robert W. Hughes, Waltraud M. Kriven

Research output: Contribution to journalArticlepeer-review

Abstract

The thermal expansion behavior of the orthorhombic phase in the Ln2TiO5 (Ln = La, Nd, Gd, Dy, and Y) system was evaluated, using synchrotron X-ray diffraction from room temperature to approximately 1500°C in air. The components of the thermal expansion tensor were calculated from the refined d-spacings, using the program CTEAS. Subsequent analysis of the thermal expansion and crystallographic information revealed that the mechanism behind the thermal expansion was a result of strained trigonal-bipyramidal structures overcoming an energy barrier to become more relaxed. The temperature at which a significant shift in the trigonal-bipyramidal structure manifests was correlated with the size of the rare-earth cation that dictates the volume of the overall cell. Larger rare-earth cations with larger cell volumes allow more room for the trigonal-bipyramidal structures to easily relax.

Original languageEnglish (US)
Pages (from-to)4096-4101
Number of pages6
JournalJournal of the American Ceramic Society
Volume98
Issue number12
DOIs
StatePublished - Dec 1 2015

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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