Structures, Phase Transitions and Tricritical Behavior of the Hybrid Perovskite Methyl Ammonium Lead Iodide

Abstract We have examined the crystal structures and structural phase transitions of the deuterated, partially deuterated and hydrogenous organic-inorganic hybrid perovskite methyl ammonium lead iodide (MAPbI 3 ) using time-of-flight neutron and synchrotron X-ray powder diffraction. Near 330 K the high temperature cubic phases transformed to a body-centered tetragonal phase. The variation of the order parameter Q for this transition scaled with temperature T as Q ∼ (T c −T) β , where T c is the critical temperature and the exponent β was close to ¼, as predicted for a tricritical phase transition. However, we also observed coexistence of the cubic and tetragonal phases over a range of temperature in all cases,…

• UD
  U.S. Department of Energy

  Awards: AC05-00OR22725, AC02-06CH11357, Contract No. DE-AC05-00OR22725, Contract No. DE-AC02-06CH11357, . DE-AC05-00OR22725, DE-AC02, 06CH11357, No. DE-AC05-00OR22725, No. DE-AC02-06CH11357, DE-AC02-06CH11357, DE-AC05, 00OR22725, DE-AC02-
• B
  Battelle

  Awards: DE-AC02-06CH11357, DE-AC05, DE-AC05-00OR22725
• BY
  Brigham Young University
• U
  UT-Battelle

  Awards: DE-AC05-, No. DE-AC05-00OR22725, AC05-00OR22725
• UO
  University of Toronto
• OO
  Office of Science

  Awards: DE-AC05-00OR22725, No. DE-AC05-00OR22725, DE-AC02-06CH11357, Contract No. DE-AC02-06CH11357, DE-AC02, No. DE-AC02-06CH11357, 06CH11357, AC02-06CH11357, AC05-00OR22725
• BE
  Basic Energy Sciences

  Awards: DE-AC02, DE-AC05-00OR22725, AC05-00OR22725, Contract No. DE-AC02-06CH11357, AC02-06CH11357, 06CH11357
• LD
  Laboratory Directed Research and Development

  Awards: No. DE-AC02-06CH11357, DE-AC05-00OR22725, DE-AC02-06CH11357
• AN
  Argonne National Laboratory

  Awards: DE-AC02, No. DE-AC02-06CH11357, 06CH11357, AC02-06CH11357, Contract No. DE-AC02-06CH11357
• OR
  Oak Ridge National Laboratory

  Awards: AC05-00OR22725, Contract No. DE-AC05-00OR22725, DE-AC02-06CH11357