Results 221 to 230 of about 77,031 (254)

On the Origin of the Negative Thermal Expansion Behavior of YCu

Inorganic Chemistry, 2019
Among the intermetallics and alloys, YCu is an unusual material because it displays negative thermal expansion without spin ordering. The mechanism behind this behavior that is caused by the structural phase transition of YCu has yet to be fully understood. To gain insight into this mechanism, we experimentally examined the crystal structure of the low-
Hiroshi Mizoguchi, Joonho Bang, Takeshi Inoshita, Toshio Kamiya, Hideo Hosono   +4 more
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Origin of negative thermal expansion phenomenon in solids

Scripta Materialia, 2011
We show that the negative thermal expansion (NTE) phenomenon originates from the existence of high pressure, small volume phases with higher entropy, with their configurations present in the stable phase matrix through thermal fluctuations, thus exists.
Zi-Kui Liu, Yi Wang, Shun-Li Shang
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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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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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Local behaviour of negative thermal expansion materials

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 2006
EXAFS can represent a powerful probe of the local behaviour of negative thermal expansion (NTE) materials, thanks to the possibility of measuring the expansion of selected inter-atomic bonds and the perpendicular relative atomic displacements. The effectiveness of EXAFS for NTE studies is illustrated by a comparison of results recently obtained on ...
Fornasini, Paolo, Dalba, Giuseppe, Grisenti, Rolly, Purans, Juris, Vaccari, Marco, F. Rocca, Sanson, Andrea   +6 more
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Coprecipitation synthesis and negative thermal expansion of NbVO5

Dalton Transactions, 2011
We develop a coprecipitation synthesis route to prepare NbVO(5) with simple oxide Nb(2)O(5) and NH(4)VO(3) as starting materials. No metal alkoxide or organometallic substance was used in the process. Nano-crystal NbVO(5) was obtained by calcination of the coprecipitates at 550 °C for 2 h. DSC/TG and XRD investigations indicate that the target compound
Wang, Jinrui, Deng, Jinxia, Yu, Ranbo, Chen, Jun, Xing, Xianran   +4 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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Negative thermal expansion and oxygen-redox electrochemistry

Nature
Structural disorder within materials gives rise to fascinating phenomena, attributed to the intricate interplay of their thermodynamic and electrochemical properties1,2. Oxygen-redox (OR) electrochemistry offers a breakthrough in capacity limits, while inducing structural disorder with reduced electrochemical reversibility3-5.
Bao Qiu, Yuhuan Zhou, Haoyan Liang, Minghao Zhang, Kexin Gu, Tao Zeng, Zhou Zhou, Wen Wen, Ping Miao, Lunhua He, Yinguo Xiao, Sven Burke, Zhaoping Liu, Ying Shirley Meng   +13 more
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Coefficient of thermal expansion of stacked auxetic and negative thermal expansion laminates

physica status solidi (b), 2010
AbstractAnalytical expressions for the in‐plane and out‐of‐plane coefficients of thermal expansion for laminates with isotropic laminas are presented herein based on (i) zero net force on the laminate edges, (ii) equal displacement of the lamina edges, and (iii) Hooke's law in three dimensions.
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Negative thermal expansion in magnetic materials

Progress in Materials Science, 2021
Shiqing Deng, Kun Lin, Jun Chen
exaly