1 Non-congruence of high-temperature mechanical and structural behaviors of LaCoO3 based perovskites – ACCEPTED 03.11.16 Amjad Aman 1 , Ryan Jordan 1 ,Yan Chen 1,2 , Richard Stadelmann 1 , Mykola Lugovy 1,3 , Nina Orlovskaya 1* , E. Andrew Payzant 2 , Clarina dela Cruz 4 , Michael J. Reece 5 , Thomas Graule 6 , Jakob Kuebler 6 1 Department of Mechanical and Aerospace Engineering, University of Central Florida, Orlando, Florida 32816, USA 2 Chemical and Engineering Materials Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA 3 Institute for Problems of Materials Science, Kiev, Ukraine 4 Quantum Condensed Matter Division, Neutron Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA 5 The School of Engineering and Materials Science, Queen Mary, University of London, London, UK 6 Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for High Performance Ceramics, Ueberlandstrasse 129, 8600 Duebendorf, Switzerland * Corresponding author: email Nina.Orlovskaya@ucf.edu Phone: 1-407-913-4438. Address: 4000 Central Florida Blvd., Orlando, Fl 32816 Abstract This paper presents the mechanical behavior of LaCoO3 and La0.8Ca0.2CoO3 ceramics under four- point bending in which the two cobaltites are subjected to a low stress of ~8 MPa at temperatures