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Special Issue "Negative Thermal Expansion Materials"

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A special issue of Materials (ISSN 1996-1944).

Deadline for manuscript submissions: closed (31 March 2012)

Special Issue Editor

Guest Editor
Prof. Dr. Abhi Ray

Faculty of Engineering, University of Technology, Sydney, P.O. Box 123, Broadway, NSW 2007, Australia
Phone: +61 2 9514 1788
Interests: inorganic building materials; cement chemistry; mineral chemistry; X-ray diffraction analysis; recycling of natural and manufactured ceramic waste materials

Published Papers (2 papers)

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Research

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Open AccessArticle Atomistic Modeling of the Negative Thermal Expansion in δ- Plutonium Based on the Two-State Description
Materials 2012, 5(6), 1040-1054; doi:10.3390/ma5061040
Received: 11 April 2012 / Revised: 3 May 2012 / Accepted: 1 June 2012 / Published: 7 June 2012
Cited by 3 | PDF Full-text (534 KB) | HTML Full-text | XML Full-text
Abstract
The δ phase of plutonium with the fcc structure exhibits an unusual negative thermal expansion (NTE) over its narrow temperature range of stability, 593–736 K. An accurate description of the anomalous high-temperature volume effect of plutonium goes beyond the current capability of electronic-structure calculations. We propose an [...] Read more.
The δ phase of plutonium with the fcc structure exhibits an unusual negative thermal expansion (NTE) over its narrow temperature range of stability, 593–736 K. An accurate description of the anomalous high-temperature volume effect of plutonium goes beyond the current capability of electronic-structure calculations. We propose an atomistic scheme to model the thermodynamic properties of δ-Pu based on the two-state model of Weiss for the Invar alloys, inspired by the simple free-energy analysis previously conducted by Lawson et al. The two-state mechanism is incorporated into the atomistic description of a many-body interacting system. Two modified embedded atom method potentials are employed to represent the binding energies of two competing electronic states in δ-Pu. We demonstrate how the NTE takes place in δ-Pu by means of Monte Carlo simulations implemented with the two-state mechanism. Full article
(This article belongs to the Special Issue Negative Thermal Expansion Materials)

Review

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Open AccessReview Two Decades of Negative Thermal Expansion Research: Where Do We Stand?
Materials 2012, 5(6), 1125-1154; doi:10.3390/ma5061125
Received: 16 April 2012 / Revised: 1 June 2012 / Accepted: 15 June 2012 / Published: 20 June 2012
Cited by 85 | PDF Full-text (807 KB) | HTML Full-text | XML Full-text
Abstract
Negative thermal expansion (NTE) materials have become a rapidly growing area of research over the past two decades. The initial discovery of materials displaying NTE over a large temperature range, combined with elucidation of the mechanism behind this unusual property, was followed [...] Read more.
Negative thermal expansion (NTE) materials have become a rapidly growing area of research over the past two decades. The initial discovery of materials displaying NTE over a large temperature range, combined with elucidation of the mechanism behind this unusual property, was followed by predictions that these materials will find use in various applications through controlled thermal expansion composites. While some patents have been filed and devices built, a number of obstacles have prevented the widespread implementation of NTE materials to date. This paper reviews NTE materials that contract due to transverse atomic vibrations, their potential for use in controlled thermal expansion composites, and known problems that could interfere with such applications. Full article
(This article belongs to the Special Issue Negative Thermal Expansion Materials)
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