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Title: Synthesis of monodisperse CeO2-ZrO2 particles exhibiting cyclic superelasticity over hundreds of cycles

Journal Article · · Journal of the American Ceramic Society
DOI:https://doi.org/10.1111/jace.14972· OSTI ID:1379645
ORCiD logo [1];  [1];  [1];  [2];  [3];  [1];  [1]
  1. Nanyang Technological Univ. (Singapore)
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Nano- and microscale CeO2–ZrO2 (CZ) shape memory ceramics are promising materials for smart micro-electro-mechanical systems (MEMS), sensing, actuation and energy damping applications, but the processing science for scalable production of such small volume ceramics has not yet been established. Herein, we report a modified sol-gel method to synthesize highly monodisperse spherical CZ particles with diameters in the range of ~0.8-3.0 μm. Synchrotron X-ray micro-diffraction (μSXRD) confirmed that most of the particles are single crystal after annealing at 1450°C. Having a monocrystalline structure and a small specimen length scale, the particles exhibit significantly enhanced shape memory and superelasticity properties with up to ~4.7% compression being completely recoverable. Highly reproducible superelasticity through over five hundred strain cycles, with dissipated energy up to ~40 MJ/m3 per cycle, is achieved in the CZ particles containing 16 mol% ceria. This cycling capability is enhanced by ten times compared with our first demonstration using micropillars (only 50 cycles in Lai et al, Science, 2013, 341, 1505). Furthermore, the effects of cycling and testing temperature (in 25°C-400°C) on superelasticity have been investigated.

Research Organization:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1379645
Journal Information:
Journal of the American Ceramic Society, Vol. 100, Issue 9; ISSN 0002-7820
Publisher:
American Ceramic SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 12 works
Citation information provided by
Web of Science

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Cited By (2)

Robust Cellular Shape‐Memory Ceramics via Gradient‐Controlled Freeze Casting journal September 2019
Enhanced shape memory and superelasticity in small-volume ceramics: a perspective on the controlling factors journal October 2017

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