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Title: Time and frequency dependent mechanical properties of LaCoO3-based perovskites: Neutron diffraction and domain mobility

Journal Article · · Journal of Applied Physics
DOI: https://doi.org/10.1063/1.5037051 · OSTI ID:1488729
 [1];  [2];  [2];  [3];  [4];  [4];  [5]; ORCiD logo [6]; ORCiD logo [6]; ORCiD logo [6]
  1. Univ. of Central Florida, Orlando, FL (United States); Institute for Problems of Materials Science, Kiev (Ukraine)
  2. Univ. of Central Florida, Orlando, FL (United States)
  3. Institute for Problems of Materials Science, Kiev (Ukraine)
  4. Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for High Performance Ceramics, Duebendorf (Switzerland)
  5. Queen Mary University of London (United Kingdom)
  6. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
+ Show Author Affiliations

The study of domain wall movement and texture formation in ferroelastic LaCoO3 perovskite under constant applied compressive stress has been performed using in situ neutron diffraction. Additionally, it was established that under constant applied compressive stress the domain walls show mobility that may lead both to the shrinkage (creep strain) and to the expansion (negative creep strain) of LaCoO3 perovskite. The domain wall movement and texture formation can be explained by the availability, mobility, and interaction of twins, stacking faults, antiphase boundaries, dislocations, and point defects, such as oxygen vacancies and their complexes as well as impurity atoms. Lastly, the equation of motion was used to describe the possible mechanisms of domain wall movement under applied stress, and it was determined that the available solutions of this equation allow both for the shrinkage (creep strain) and for the expansion (negative creep strain) of LaCoO3 perovskite to occur.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1488729
Journal Information:
Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 20 Vol. 124; ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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