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Parameter-free prediction of phase transition in PbTiO3 through combination of quantum mechanics and statistical mechanics

Journal Article · · Scripta Materialia
 [1];  [1];  [2];  [1]
  1. Pennsylvania State Univ., University Park, PA (United States)
  2. Pennsylvania State Univ., University Park, PA (United States); Northwestern Polytechnical Univ., Xi'an, Shaanxi (China)
Thermodynamics of ferroelectric materials and their ferroelectric to paraelectric (FE-PE) transitions is commonly described by the phenomenological Landau theory and more recently by effective Hamiltonian and various potentials, all with model parameters fitted to experimental or theoretical data. Here, in this work, we show that the zentropy theory, which considers the total entropy of a system as a weighted sum of entropies of configurations that the system may experience and the statistical entropy among the configurations, can predict the FE-PE transition without fitting parameters. For PbTiO3, the configurations are identified as the FE configurations with 90- or 180° domain walls in addition to the ground state FE configuration without domain wall. With the domain wall energies predicted from first-principles based on density functional theory in the literature as the only inputs, the FE-PE transition for PbTiO3 is predicted showing remarkable agreement with experiments, unveiling the microscopic fundamentals of the transition.
Research Organization:
Pennsylvania State Univ., University Park, PA (United States); Pennsylvania State University, University Park, PA (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0023185
OSTI ID:
2422207
Alternate ID(s):
OSTI ID: 1971418
OSTI ID: 3022578
Journal Information:
Scripta Materialia, Journal Name: Scripta Materialia Vol. 232; ISSN 1359-6462
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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