Negative thermal expansion property of CuMoO4
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Negative Thermal Expansion
Hexahedron
Triclinic crystal system
Negative thermal expansion materials are important and desirable in science and engineering applications. However, natural materials with isotropic negative thermal expansion are rare and usually unsatisfied in performance. Here, we propose a novel method to achieve negative thermal expansion via a metamaterial approach. The metamaterial is constructed with unit cells that combine bi-material strips and anti-chiral structures. Both experimental and simulation results display isotropic negative thermal expansion properties. The coefficient of negative thermal expansion of the metamaterials is demonstrated to be dependent on the difference between the thermal expansion coefficients of two component materials in the bi-material strips, as well as on the circular node radius and the ligament length in the anti-chiral structures. The measured value of the linear negative thermal expansion coefficient reaches -68.1X10-6 1/K in an operating temperature range from 303.15 K to 773.15 K, which is among the largest achieved in experiments to date. Our findings provide a novel and practical approach to obtaining materials with tunable isotropic negative thermal expansion on any scale.
Negative Thermal Expansion
STRIPS
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Negative thermal expansion materials are important and desirable in science and engineering applications. However, natural materials with isotropic negative thermal expansion are rare and usually unsatisfied in performance. Here, we propose a novel method to achieve two- and three-dimensional negative thermal expansion metamaterials via antichiral structures. The two-dimensional metamaterial is constructed with unit cells that combine bimaterial strips and antichiral structures, while the three-dimensional metamaterial is fabricated by a multimaterial 3D printing process. Both experimental and simulation results display isotropic negative thermal expansion property of the samples. The effective coefficient of negative thermal expansion of the proposed models is demonstrated to be dependent on the difference between the thermal expansion coefficient of the component materials, as well as on the circular node radius and the ligament length in the antichiral structures. The measured value of the linear negative thermal expansion coefficient of the three-dimensional sample is among the largest achieved in experiments to date. Our findings provide an easy and practical approach to obtaining materials with tunable negative thermal expansion on any scale.
Negative Thermal Expansion
Thermomechanical analysis
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Negative Thermal Expansion
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The negative thermal expansion (NTE) behavior provides us an opportunity to design materials with controllable coefficient of thermal expansion (CTE). In this letter, we report a tunable isotropic thermal expansion in the cubic (Sc1−xZrx)F3+δ over a wide temperature and CTE range (αl = −4.0 to+ 16.8 × 10−6 K−1, 298–648 K). The thermal expansion can be well adjusted from strong negative to zero, and finally to large positive. Intriguingly, isotropic zero thermal expansion (αl = 2.6 × 10−7 K−1, 298–648 K) has been observed in the composition of (Sc0.8Zr0.2)F3+δ. The controllable thermal expansion in (Sc1−xZrx)F3+δ is correlated to the local structural distortion. Interestingly, the ordered magnetic behavior has been found in the zero thermal expansion compound of (Sc0.8Zr0.2)F3+δ at room temperature, which presumably correlates with the unpaired electron of the lower chemical valence of Zr cation. The present study provides a useful reference to control the thermal expansion and explore the multi-functionalization for NTE materials.
Negative Thermal Expansion
Atmospheric temperature range
Valence electron
Magnetism
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Negative Thermal Expansion
Atmospheric temperature range
Lattice (music)
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By tuning the structural phase transition in Zn2–xMgxP2O7, large negative thermal expansion (NTE) was achieved at room temperature. An earlier report described that Zn2P2O7 undergoes a structural phase transition at 405 K, accompanied by volume contraction of 1.8% on heating. Results showed that as Mg doping proceeds, the transition temperature decreases. Also, the volume change becomes gradual with respect to temperature. Particularly, Zn1.6Mg0.4P2O7 has a large negative coefficient of linear thermal expansion αL of −60 ppm/K at 280–350 K. Structural analysis using synchrotron radiation revealed that this dilatometric NTE is almost identical to that of crystallographic unit cells, indicating less dominant structural effects on NTE. We also verified thermal expansion compensation capabilities of powdered Zn1.6Mg0.4P2O7 by evaluating the thermal expansion of the epoxy resin matrix composites. The present phosphates are promising for use as practical thermal expansion compensators because they are free of toxic or expensive elements and can be fabricated in air using the simple solid-state reaction method.
Negative Thermal Expansion
Thermomechanical analysis
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Negative Thermal Expansion
Atmospheric temperature range
Rietveld Refinement
Temperature coefficient
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Cr2(WO4)3 and Cr2(MoO4)3 powders were prepared by liquid phase reaction-precursor sintering method. in situ-powder X-ray diffraction data from 298 to 1 073 K shows an essentially linear increase in cell volume as a function of experimental temperature. The intrinsic linear coefficient of thermal expansion from these data is (1.274±0.003)×10-6 K-1 and (1.612±0.003)×10-6 K-1, respectively. Thermal expansion behavior of Cr2(WO4)3 and Cr2(MoO4)3 was studied in static air in the temperature range of 298 to 1 073 K by a thermo-dilatometer. Two samples showed a positive thermal expansion in the beginning, followed by a phase transition and then a negative thermal expansion (NTE). The negative thermal expansion coefficients (NTEC) of Cr2(WO4)3 and Cr2(MoO4)3 were (-7.033±0.014)×10-6 K-1 and (-9.282±0.019)×10-6 K-1, respectively.
Negative Thermal Expansion
Dilatometer
Atmospheric temperature range
Tungstate
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The isotropic negative thermal expansion compound,ZrW2O8,has been intensively studied since 1996.A variety of newly discovered materials which show even larger negative thermal expansion than that of ZrW2O8 are presently under consideration,namely CN-bridged compounds,ferroelectric ceramics,anti-perovskite manganese nitrides and nanoparticles.The mechanisms associated with the negative thermal expansion effect of these compounds are discussed in terms of their vibrational structures or in terms of their magnetic or electronic transitions.The materials with a large negative thermal expansion coefficient have potentially useful for preparing composites which are insensitive towards temperature changes.
Negative Thermal Expansion
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Negative Thermal Expansion
Tungstate
Atmospheric temperature range
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