Topic
Thermal expansion
About: Thermal expansion is a research topic. Over the lifetime, 21040 publications have been published within this topic receiving 349407 citations. The topic is also known as: heat expansion.
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TL;DR: In this article, the thermal expansion of the binary compounds Li2O.5Al2O3 and Li 2O.3 and the ternary compounds β-eucryptite and βT-spodumene and solid solutions involving these two compounds can be prepared by reaction of Li 2CO3, Al 2O3, and SiO2 at 1300°C.
Abstract: The binary compounds Li2O.5Al2O3 and Li2O.Al2O3 can be formed easily by reaction of pure materials at 1500°C. The ternary compounds βeucryptite and βT-spodumene and solid solutions involving these two compounds can be prepared by reaction of Li2CO3, Al2O3, and SiO2 at 1300°C. The thermal expansions of the lithium aluminates are very high, but the expansions of β-spodumene and β-spodumene solid solutions are very low. The compound β-eucryptite is unusual in that it shows a high thermal contraction to 1000°C. Some relations between the expansion data and the crystal structure of the phases given above are discussed.
170 citations
TL;DR: Single-network cadmium cyanide displays isotropic negative thermal expansion behavior of unprecedented magnitude over a large temperature range (see graph of unit cell parameter a versus temperature).
Abstract: Accentuate the negative: Single-network cadmium cyanide displays isotropic negative thermal expansion behavior of unprecedented magnitude over a large temperature range (see graph of unit cell parameter a versus temperature). Guest molecules in the pores of this framework block the transverse vibrational modes responsible for this behavior, causing the value of the linear coefficient of thermal expansion to increase with guest occupancy.
169 citations
01 Nov 1993-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this article, a new fundamental approach to the design of high strength, high thermal conductivity dispersion-strengthened copper alloys for applications in actively cooled structures is developed.
Abstract: A new fundamental approach to the design of high strength, high thermal conductivity dispersion-strengthened copper alloys for applications in actively cooled structures is developed. This concept is based on a consideration of the basic principles of thermodynamics, kinetics and mechanical properties. The design requirements for these materials include a uniform distribution of fine particles for creep and fatigue resistance, a high thermal conductivity, thermodynamic and chemical stability at temperatures up to 1300 K, a small difference in the coefficients of thermal expansion between the particle and matrix, and low particle coarsening rates at the processing and service temperatures. The theory for creep of dispersion-strengthened metals developed by Rosler and Arzt is used to predict the optimum particle size for a given service temperature and to illustrate the need for a high interfacial energy. Resistance to coarsening leads to a requirement for low diffusivity and solubility of particle constituent elements in the matrix. Based on the needs for a low difference in the coefficients of thermal expansion to minimize thermal-mechanical fatigue damage and low diffusivity and solubility of the constituent elements, several candidate ceramic phases are compared using a weighted property index scheme. The results of this quantitative comparison suggest that CeO2, MgO, CaO and possibly Y2O3 may be good candidates for the dispersed phase in a copper matrix.
169 citations
TL;DR: A simple analytic embedded-atom model that includes more than nearest neighbors is presented to study the thermodynamic properties of copper with molecular dynamics and the calculated fractional density change on melting, heat of fusion, linear coefficients of thermal expansion, and heat capacities above room temperature are in good agreement with experimental results.
Abstract: A simple analytic embedded-atom model that includes more than nearest neighbors is presented. Parameters for Cu, Ag, Au, Ni, Pd, and Pt have been obtained. The model has been applied to study the thermodynamic properties of copper with molecular dynamics. The calculated fractional density change on melting, heat of fusion, linear coefficients of thermal expansion, and heat capacities above room temperature are in good agreement with experimental results.
169 citations
TL;DR: In this paper, the authors proposed a combinatorial approach for the design of extreme thermo-mechanical properties of MOFs addressing the regime between crystalline solid matter and the liquid state.
Abstract: Functionalized metal–organic frameworks (fu-MOFs) of general formula [Zn2(fu-L)2dabco]n show unprecedentedly large uniaxial positive and negative thermal expansion (fu-L = alkoxy functionalized 1,4-benzenedicarboxylate, dabco = 1,4-diazabicyclo[2.2.2]octane). The magnitude of the volumetric thermal expansion is more comparable to property of liquid water rather than any crystalline solid-state material. The alkoxy side chains of fu-L are connected to the framework skeleton but nevertheless exhibit large conformational flexibility. Thermally induced motion of these side chains induces extremely large anisotropic framework expansion and eventually triggers reversible solid state phase transitions to drastically expanded structures. The thermo-responsive properties of these hybrid solid–liquid materials are precisely controlled by the choice and combination of fu-Ls and depend on functional moieties and chain lengths. In principle, this combinatorial approach allows for a targeted design of extreme thermo-mechanical properties of MOFs addressing the regime between crystalline solid matter and the liquid state.
168 citations