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The study asks whether multicomponent (high-entropy) ceramics can be 3D-printed at the nanoscale and whether their chemical disorder makes ceramic nanolattices both strong and damage tolerant. The authors developed transparent, solvent-free metal-acrylate photoresins (more than 15 metals, up to 70 wt% metal acrylates) for two-photon polymerization, then used a two-step sintering schedule (1300 °C then 1200 °C) and sacrificial spring supports to obtain fully dense, high-fidelity (Ba0.2Sr0.2Ca0.2La0.2Mg0.2)TiO3 perovskite architectures with features down to about 150 nm. Measured TEM analysis sh
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. . . doi.org/10.1126/sciadv.adw6632
Topics in this paper
Engineering
with engineering application prospects in mechanical metamaterials, nanoelectromechanical systems, and damage-tolerant lightweight materials
Page 1, article header and abstract
Chemistry
the acid-base neutralization reaction between metal oxides or hydroxides and acrylic acid is used to yield metal acrylates
Page 3-4, Composition design and resin synthesis of HEC
Physics
Dislocations are the internal line defects formed by the irregular arrangement of local atoms in crystal materials.
Page 5, High-entropy-enhanced strength and ductility
high entropy ceramics
we report a high-entropy ceramic (HEC) 3D architecture with feature size down to 150 nanometers
Page 1, abstract
mechanical metamaterials
Mechanical metamaterial is a type of structural materials that obtain special properties beyond that of natural conventional materials
Page 1, Introduction
two photon polymerization
Combining two-photon polymerization with a two-step sintering process, we fabricate fully dense and high-fidelity HEC 3D architectures.
Page 1, abstract
nanolattices
a 3 × 3 × 3 HEC octet truss and a 3 × 3 × 3 PC octet truss are fabricated with the same structure size about 5 μm
Page 6, High strength and energy absorption of HEC nanolattice
dislocations
high-entropy strategies are a promising pathway for generating a high density of dislocations to promote enhanced strength and ductility in HEC
Page 5, High-entropy-enhanced strength and ductility
two step sintering
we adopt two-step sintering approach for HEC preparation (Fig. 3A)
Page 4, Fully dense HEC 3D nanoarchitecture with high fidelity
perovskite oxides
a single-phase stable HEC (Ba0.2Sr0.2Ca0.2La0.2Mg0.2)TiO3 has been successfully designed by five compatible metal elements in A site of ABO3
Page 3, Composition design and resin synthesis of HEC
finite element analysis
we performed a series of FE simulations of compressing samples, where the initial structure defects are applied by different percentages of buckling eigenmode
Page 7, High strength and energy absorption of HEC nanolattice