Results 211 to 220 of about 77,031 (254)

Negative thermal expansion in molecular materials

Chemical Communications, 2018
Some mechanisms resulting in negative thermal expansion in molecular materials are summarized.
Zhanning Liu, Qilong Gao, Jun Chen, Jinxia Deng, Kun Lin, Xianran Xing   +5 more
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Chemical Diversity for Tailoring Negative Thermal Expansion

Chemical Reviews, 2022
Negative thermal expansion (NTE), referring to the lattice contraction upon heating, has been an attractive topic of solid-state chemistry and functional materials. The response of a lattice to the temperature field is deeply rooted in its structural features and is inseparable from the physical properties.
Qiang Li, Kun Lin, Zhanning Liu, Lei Hu, Yili Cao, Jun Chen, Xianran Xing   +6 more
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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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Negative Thermal Expansion Coefficient

2019 IEEE 2nd Ukraine Conference on Electrical and Computer Engineering (UKRCON), 2019
Physical nature of negative thermal expansion coefficient ($\alpha$) in polar-sensitive dielectrics and semiconductors is explained. Physical features of inter-atomic bonds in crystals are manifested in their thermal expansion; in the polar dielectrics it is a peculiar polar-sensitive structure, arisen due to compensation of atoms electronegativity ...
Y.M. Poplavko, Y.V. Didenko, Y.I. Yakimenko   +2 more
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Origin of the negative thermal expansion in and

Journal of Physics: Condensed Matter, 1996
The negative thermal expansion recently observed over a wide range of temperatures in may be attributed to the existence of low-frequency phonon modes which can propagate with no distortions of the tetrahedra and octahedra, the so-called `rigid unit modes'.
Alexandra K A Pryde, Kenton D Hammonds, Martin T Dove, Volker Heine, Julian D Gale, Michele C Warren   +5 more
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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 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

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 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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Thermal Enhancement of Luminescence for Negative Thermal Expansion in Molecular Materials

Journal of the American Chemical Society, 2022
Overcoming thermal quenching is an essential issue in the practical application of luminescent materials. Herein, we found that negative thermal expansion (NTE) can achieve the thermal enhancement of luminescence in molecular materials based on three metal-organic frameworks CuX-bpy (X = Cl, Br, I; bpy = 4,4'-bipyridine).
Liang Chen, Xin Chen, Rui Ma, Kun Lin, Qiang Li, Jian-Ping Lang, Chunyu Liu, Kenichi Kato, Ling Huang, Xianran Xing   +9 more
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