Neutron Diffraction Study On Gamma To Alpha Phase Transition In Ce0.9th0.1 Alloy

Journal Article · Tue Jan 01 00:00:00 EST 2008 · Philosophical Magazine Letters

OSTI ID:960603

Lashley, Jason C1 ^[1]; Heffner, Robert H ^[1]; Llobet, A ^[1]; Darling, T W ^[2]; Jeong, I K ^[3]

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1. Los Alamos National Laboratory
2. U OF NEVADA
3. PUSAN NATL UNIV

Comprehensive neutron diffraction measurements were performed to study the isostructural {gamma} {leftrightarrow} {alpha} phase transition in Ce{sub 0.9}Th{sub 0.1} alloy. Using Rietveld refinements, we obtained lattice and thermal parameters as a function of temperature. From the temperature slope of the thermal parameters, we determined Debye temperatures {Theta}{sup {gamma}}{sub D} = 133(1) K and {Theta}{sup {alpha}}{sub D} = 140(1) K for the {gamma} phase and the {alpha} phase, respectively. This result implies that the vibrational entropy change is not significant at the {gamma} {leftrightarrow} {alpha} transition, contrary to that from elemental Cerium [Phys. Rev. Lett. 92, 105702, 2004].

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC52-06NA25396
• OSTI ID: 960603
• Report Number(s): LA-UR-08-05463; LA-UR-08-5463; PMLEEG; TRN: US201006%%1243
• Journal Information: Philosophical Magazine Letters, Journal Name: Philosophical Magazine Letters; ISSN 0950-0839
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALLOYS
CERIUM
CERIUM ALLOYS
DEBYE TEMPERATURE
ENTROPY
FUNCTIONS
LATTICE PARAMETERS
NEUTRON DIFFRACTION
PHASE TRANSFORMATIONS
THORIUM ALLOYS