Title

In-situ neutron diffraction of LaCoO3 perovskite under uniaxial compression. I. Crystal structure analysis and texture development

Authors

Authors

A. Aman; Y. Chen; M. Lugovy; N. Orlovskaya; M. J. Reece; D. Ma; A. D. Stoica;K. An

Comments

Authors: contact us about adding a copy of your work at STARS@ucf.edu

Abbreviated Journal Title

J. Appl. Phys.

Keywords

CERAMICS; FERROELASTICITY; TRANSITIONS; BEHAVIOR; STRAINS; DOMAINS; VULCAN; Physics, Applied

Abstract

The dynamics of texture formation, changes in crystal structure, and stress accommodation mechanisms have been studied in perovskite-type R (3) over barc rhombohedral LaCoO3 during uniaxial compression using in-situ neutron diffraction. The in-situ neutron diffraction revealed the complex crystallographic changes causing the texture formation and significant straining along certain crystallographic directions during compression, which are responsible for the appearance of hysteresis and non-linear ferroelastic deformation in the LaCoO3 perovskite. The irreversible strain after the first loading was connected with the appearance of non-recoverable changes in the intensity ratio of certain crystallographic peaks, causing non-reversible texture formation. However, in the second loading/unloading cycle, the hysteresis loop was closed and no further irrecoverable strain appeared after deformation. The significant texture formation is responsible for an increase in the Young's modulus of LaCoO3 at high compressive stresses, ranging from 76 GPa at the very beginning of the loading to 194 GPa at 900 MPa at the beginning of the unloading curve. (C) 2014 AIP Publishing LLC.

Journal Title

Journal of Applied Physics

Volume

116

Issue/Number

1

Publication Date

1-1-2014

Document Type

Article

Language

English

First Page

10

WOS Identifier

WOS:000339621400013

ISSN

0021-8979

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