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

Mykola Lugovy; Amjad Aman; Nina Orlovskaya; Viktor Slyunyayev; Thomas Graule; Jakob Kuebler; Michael J. Reece; Yan Chen; Dong Ma; Ke An

doi:10.1063/1.5037051

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

Mykola Lugovy, Amjad Aman, Nina Orlovskaya, Viktor Slyunyayev, Thomas Graule, Jakob Kuebler, Michael J. Reece, Yan Chen, Dong Ma, Ke An

Materials Engineering

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

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. 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. 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.

Original language	English
Article number	205104
Journal	Journal of Applied Physics
Volume	124
Issue number	20
DOIs	https://doi.org/10.1063/1.5037051
State	Published - Nov 28 2018

Funding

This work was supported by the NSF Project No. CMMI-0968911 “Time Dependent Creep Deformation of Nonpolar Mixed Conducting Ferroelastic Perovskites.” Neutron scattering was carried out at the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory, which is one of the user facilities sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy. The authors thank Mr. H. D. Skorpenske from SNS for the technical support of the neutron experiment.

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abstract = "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. 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. 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.",

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AU - Lugovy, Mykola

AU - Aman, Amjad

AU - Orlovskaya, Nina

AU - Slyunyayev, Viktor

AU - Graule, Thomas

AU - Kuebler, Jakob

AU - Reece, Michael J.

AU - Chen, Yan

AU - Ma, Dong

AU - An, Ke

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

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