Results 231 to 240 of about 477,147 (274)

Negative Thermal Expansion

MRS Proceedings, 2002
ABSTRACTNegative thermal expansion behavior has been found in many oxides where oxygen or a cation has a coordination number of two. The MO2, AM2O7, A2M3O12, AMO5, and AO3 families, where A is an octahedral cation, M a tetrahedral cation, and the oxygen coordination is two, have been investigated for their thermal expansion properties. Negative thermal
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Negative thermal expansion in Y2W3O12

International Journal of Inorganic Materials, 1999
Abstract Neutron diffraction data were collected on polycrystalline Y2W3O12 at seven temperatures from 15 to 1373 K. All three cell edges of orthorhombic Y2W3O12 decrease with increasing temperature, giving an average linear thermal expansion coefficient of −7.0×10−6 K−1.
P.M. Forster, A.W. Sleight
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Negative thermal expansion of laminates

Journal of Materials Science, 2004
Measurements have been carried out on the in-plane and through the thickness thermal expansion coefficients of glass polypropylene fibre composites of 50% volume fraction between room temperature and 120°C. Only in the temperature range 20° to 75°C are reproducible results obtained.
M. Landert, A. Kelly, R. J. Stearn, P. J. Hine   +3 more
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Negative thermal expansion behaviour of graphdiyne

Nano Today, 2023
Negative thermal expansion (NTE) is an effect of a material contracting upon heating, and NTE materials are useful for the preparation of zero thermal expansion (ZTE) composite materials for applications in energy conversion and electronic devices. In this work, the NTE behaviour of graphdiyne (GDY) was observed and studied by temperature-dependent ...
Kong, Ya, Yin, Yuling, Feng, Xueting, Zhang, Zixuan, Ding, Feng, Tong, Lianming, Zhang, Jin   +6 more
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Negative Thermal Expansion

2020
This chapter reviews the various 2D NTE systems, including those constructed from bimaterial strips, laminates (of various stiffness disparity), trusses (of triangular cells, Y-shaped elements, and Hoberman circle), meshes, rigid unit modes, and ring-rod assemblies (both 2D and 3D). Finally, a few examples of 3D NTE structures are briefly mentioned.
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Negative thermal expansion: a review

Journal of Materials Science, 2009
Most materials demonstrate an expansion upon heating, however a few are known to contract, i.e. exhibit a negative coefficient of thermal expansivity (NTE). This naturally occurring phenomenon has been shown to occur in a range of solids including complex metal oxides, polymers and zeolites, and opens the door to composites with a coefficient of ...
W. Miller, C. W. Smith, D. S. Mackenzie, K. E. Evans   +3 more
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ISOTROPIC NEGATIVE THERMAL EXPANSION

Annual Review of Materials Science, 1998
▪ Abstract  Materials that contract on heating are unusual and have important applications. Materials showing such negative thermal expansion behavior are usually anisotropic and usually exhibit this behavior over only a small temperature range.
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Negative thermal expansion in magnetic materials

Progress in Materials Science, 2021
Abstract By virtue of the unique advantages of compensating and controlling thermal expansion, negative thermal expansion (NTE) materials have attracted great attention and have gained rapid development in the last two decades. The history of NTE can be traced back to the discovery of magnetic Invar alloy in 1897.
Yuzhu Song, Naike Shi, Shiqing Deng, Xianran Xing, Jun Chen   +4 more
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Reversible negative thermal expansion of polymer films

Physical Review E, 2002
A basic understanding of the properties of thin polymer films is of fundamental importance for developing applications in nanotechnology. Results of energy and angle dispersive x-ray reflectivity measurements on polymer thin films as a function of temperature exhibit reversible negative thermal expansion below the glass transition temperature T(g ...
M, Mukherjee, M, Bhattacharya, M K, Sanyal, Th, Geue, J, Grenzer, U, Pietsch   +5 more
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Giant negative thermal expansion in magnetic nanocrystals

Nature Nanotechnology, 2008
Most solids expand when they are heated, but a property known as negative thermal expansion has been observed in a number of materials, including the oxide ZrW2O8 (ref. 1) and the framework material ZnxCd1-x(CN)2 (refs 2,3). This unusual behaviour can be understood in terms of low-energy phonons, while the colossal values of both positive and negative ...
X G, Zheng, H, Kubozono, H, Yamada, K, Kato, Y, Ishiwata, C N, Xu   +5 more
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