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Possible Model for Plutonium Self-Induced Anderson Localization, Phase Stability, And the Melting Temperature of Plutonium

By Cooper, Bernard R.

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Book Id: WPLBN0000129668
Format Type: PDF eBook
File Size: 0.4 MB
Reproduction Date: 2008
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Title: Possible Model for Plutonium Self-Induced Anderson Localization, Phase Stability, And the Melting Temperature of Plutonium  
Author: Cooper, Bernard R.
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Language: English
Subject: Government publications, Legislation., Government Printing Office (U.S.)
Collections: Government Library Collection
Historic
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Publisher: Government Printing Office

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Cooper, B. R. (n.d.). Possible Model for Plutonium Self-Induced Anderson Localization, Phase Stability, And the Melting Temperature of Plutonium. Retrieved from http://hawaiilibrary.net/


Excerpt
Excerpt: It has been evident for some time that the unusual structural behavior of plutonium in the transition from the ?- to the o-phase is related to the localization mechanism for the 5f electrons. As shown by Donohue (1982), the atomic volume of plutonium expands as the metal goes through the structural sequence alpha (monoclinic at 300 kelvins), beta (monoclinic at 395 kelvins), gamma (orthorhombic at 479 kelvins), and delta (face-centered-cubic, fcc, at 592 kelvins). The o-phase has a negative thermal expansion; the body-centered-tetragonal o?-phase (at 724 kelvins) also has negative thermal expansion; and the body-centered-cubic (bcc) ?-phase (at 749 kelvins) expands until melting occurs at the anomalously low temperature of 913 kelvins. In this article, we explain this unusual behavior by a multistep, spatially nonuniform 5f localization process, which is a variant of the disorder-induced localization described by Anderson (1958).

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