Landau free energy for structural phase transitions in Pu

A. Saxena; T. Lookman; R. C. Albers

Landau free energy for structural phase transitions in Pu

A. Saxena
, T. Lookman
, R. C. Albers

Los Alamos National Laboratory Theoretical Division

Research output: Contribution to conference › Paper › peer-review

Abstract

Depending on temperature, pressure and (Ga or Al) alloying plutonium undergoes a series of structural transitions. Based on crystallography and symmetry analysis of phonon modes, and relevant strain tensor components identified as order parameter, we develop a GinzburgLandau free energy for the FCC to simple monoclinic structural transition, δ → α, in Pu. We use the free energy to explore certain parts of the Pu phase diagram and relate the coefficients in the free energy expansion to experimental data such as specific heat and thermal expansion, Finally, we explore the role of intra-unit cell shuffle modes in this important transition.

Original language	English
Pages	69-74
Number of pages	6
State	Published - 2005
Externally published	Yes
Event	International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005 - Phoenix, AZ, United States Duration: 29 May 2005 → 3 Jun 2005

Conference

Conference	International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005
Country/Territory	United States
City	Phoenix, AZ
Period	29/05/05 → 3/06/05

Keywords

Phonon dispersion
Shear strains
Shuffle modes
δ → α transition

Cite this

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title = "Landau free energy for structural phase transitions in Pu",

abstract = "Depending on temperature, pressure and (Ga or Al) alloying plutonium undergoes a series of structural transitions. Based on crystallography and symmetry analysis of phonon modes, and relevant strain tensor components identified as order parameter, we develop a GinzburgLandau free energy for the FCC to simple monoclinic structural transition, δ → α, in Pu. We use the free energy to explore certain parts of the Pu phase diagram and relate the coefficients in the free energy expansion to experimental data such as specific heat and thermal expansion, Finally, we explore the role of intra-unit cell shuffle modes in this important transition.",

keywords = "Phonon dispersion, Shear strains, Shuffle modes, δ → α transition",

author = "A. Saxena and T. Lookman and Albers, \{R. C.\}",

year = "2005",

language = "英语",

pages = "69--74",

note = "International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005 ; Conference date: 29-05-2005 Through 03-06-2005",

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TY - CONF

T1 - Landau free energy for structural phase transitions in Pu

AU - Saxena, A.

AU - Lookman, T.

AU - Albers, R. C.

PY - 2005

Y1 - 2005

N2 - Depending on temperature, pressure and (Ga or Al) alloying plutonium undergoes a series of structural transitions. Based on crystallography and symmetry analysis of phonon modes, and relevant strain tensor components identified as order parameter, we develop a GinzburgLandau free energy for the FCC to simple monoclinic structural transition, δ → α, in Pu. We use the free energy to explore certain parts of the Pu phase diagram and relate the coefficients in the free energy expansion to experimental data such as specific heat and thermal expansion, Finally, we explore the role of intra-unit cell shuffle modes in this important transition.

AB - Depending on temperature, pressure and (Ga or Al) alloying plutonium undergoes a series of structural transitions. Based on crystallography and symmetry analysis of phonon modes, and relevant strain tensor components identified as order parameter, we develop a GinzburgLandau free energy for the FCC to simple monoclinic structural transition, δ → α, in Pu. We use the free energy to explore certain parts of the Pu phase diagram and relate the coefficients in the free energy expansion to experimental data such as specific heat and thermal expansion, Finally, we explore the role of intra-unit cell shuffle modes in this important transition.

KW - Phonon dispersion

KW - Shear strains

KW - Shuffle modes

KW - δ → α transition

UR - https://www.scopus.com/pages/publications/33645226455

M3 - 论文

AN - SCOPUS:33645226455

SP - 69

EP - 74

T2 - International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005

Y2 - 29 May 2005 through 3 June 2005

ER -

Landau free energy for structural phase transitions in Pu

Abstract

Conference

Keywords

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Cite this