Nanocharacterization of the negative stiffness of ferroelectric materials

0436159 - FZÚ 2015 RIV US eng J - Journal Article
Skandani, A.A. - Čtvrtlík, Radim - Al-Haik, M.
Nanocharacterization of the negative stiffness of ferroelectric materials.
Applied Physics Letters. Roč. 105, č. 8 (2014), "082906-1"-"082906-5". ISSN 0003-6951. E-ISSN 1077-3118
R&D Projects: GA TA ČR TA03010743
Institutional support: RVO:68378271
Keywords : ferroelectric materials * negative stiffness * thermomechanical environments
Subject RIV: JJ - Other Materials
Impact factor: 3.302, year: 2014

Phase changing materials such as ferroelectric materials could exhibit negative stiffness under certain thermomechanical environments. This negative stiffness is embodied by a deflection along the opposite direction of the applied load. So far negative stiffness materials were investigated with the specific morphology of embedded inclusions in stiff matrices then the resulting composite is studied to measure the behavior of each constituent indirectly. In this study, a modified nonisothermal nanoindentation method is developed to measure the negative stiffness of triglycine sulfate single crystal directly. This in-situ method is intended to first demonstrate the feasibility of detecting the negative stiffness via nanoindentation and nanocreep of a ferroelectric material at its Curie point and then to quantify the negative stiffness without the need for embedding the crystal within a stiffer matrix.
Permanent Link: http://hdl.handle.net/11104/0239963