Phase transition-crystal structure relations in ferroelectric Bi2.5Na1.5Nb3O12 compound by molecular dynamics simulation

Atsushi Yokoi, Hiroshi Masumoto, Junji Sugishita

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Crystal structure-phase transition relations in the ferroelectric Bi2.5Na1.5Nb3O12 compound were investigated by using molecular dynamics simulation method. The lattice parameters, a and b, varied with the increasing temperature, and these lattice parameters of the calculated compound indicated the similar value at the temperatures higher than 610 °C. The excess mixing enthalpy of the calculated compound increased from 0 to 14.2 kJ/mol in the temperature range of 27-410 °C, whereas the values of the compound varied from -9.6 to 0 in the temperature range of 585-800 °C. Thus, it was recognized that the thermodynamic stability of the compound obtained at the temperatures higher than 585 °C, because the excess mixing enthalpy of the compound at the temperatures higher than 585 °C indicated negative values. From these results, it was considered that the phase transition from orthorhombic crystal structure to tetragonal crystal structure may be related to the variations in thermodynamic stability.

Original languageEnglish
Pages (from-to)16-20
Number of pages5
JournalMaterials Chemistry and Physics
Volume116
Issue number1
DOIs
Publication statusPublished - 2009 Jul 15

Keywords

  • Crystal structure
  • Ferroelectricity
  • Molecular dynamics
  • Phase transitions
  • Thermodynamic properties

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Phase transition-crystal structure relations in ferroelectric Bi<sub>2.5</sub>Na<sub>1.5</sub>Nb<sub>3</sub>O<sub>12</sub> compound by molecular dynamics simulation'. Together they form a unique fingerprint.

Cite this