Hanlin Gu^1*, Jascha Rohmer^2*, Justin Jetter^2*, Andriy Lotnyk^3,4*, Lorenz Kienle^2*, Eckhard Quandt^2*, Richard D. James^1*

1 Department of Aerospace Engineering and Mechanics, University of Minnesota

2 Institute for Materials Science, Faculty of Engineering, Kiel University, Kiel, Germany

3 Leibnitz Institute for Surface Engineering (IOM), Leipzig, Germany

4 Laboratory of Infrared Materials and Devices, The Research Institute of Advanced Technologies, Ningbo University, Ningbo, Zhejiang 315211, China

* Corresponding authors emails: guxxx369@umn.edu, jaro@tf.uni-kiel.de, juje@tf.uni-kiel.de, andriy.lotnyk@iom-leipzig.de, lk@tf.uni-kiel.de, eq@tf.uni-kiel.de, james@umn.edu

DOI10.24435/materialscloud:6c-hk [version v1]

Publication date: Jul 05, 2021

How to cite this record

Hanlin Gu, Jascha Rohmer, Justin Jetter, Andriy Lotnyk, Lorenz Kienle, Eckhard Quandt, Richard D. James, Exploding and weeping ceramics, Materials Cloud Archive 2021.102 (2021), doi: 10.24435/materialscloud:6c-hk.

Description

The systematic tuning of the lattice parameters to achieve improved kinematic compatibility between phases is a broadly effective strategy for improving the reversibility, and lowering the hysteresis, of solid-solid phase transformations. Here, “kinematic compatibility” refers to the fitting together of the phases. We present an apparently paradoxical example in which tuning to near perfect compatibility in (Zr/Hf)O2-(YNb)O4 results in a high degree of irreversibility, as manifested in explosive or “weeping” behavior on cooling through the tetragonal-to-monoclinic phase transformation. In the case of weeping the polycrystal slowly and steadily falls apart at the grain boundaries. These effects occur without chemical change. Finally, tuning to satisfy a condition we term the equidistance condition results in reversible behavior with the lowest hysteresis in this system. We give evidence that all these observations are explained by a more careful analysis of compatibility of the polycrystal, accounting for sample shape. These results show that an extreme diversity of behaviors, from reversible to explosive, is possible in a chemically homogeneous system by manipulating conditions of compatibility in unexpected ways. They provide critical concepts underlying the current search for a shape memory oxide ceramic.

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Keywords

Ceramics Cystallographic compatibility Shape memory