TY - JOUR
T1 - Zero-temperature bulk modulus of alpha-plutonium
AU - Ledbetter, H.
AU - Migliori, A.
AU - Betts, J.
AU - Harrington, S.
AU - El-Khatib, S.
PY - 2005
Y1 - 2005
N2 - Using resonant-ultrasound spectroscopy, we measured alpha-plutonium's bulk modulus B between 298 and 18 K. Fitting the measurements to an Einstein-oscillator-based function gave the zero-temperature bulk modulus Bo =70.9 GPa. We compare our measurement with numerous previous measurements and with numerous theoretical estimates ranging from 41 to 227 GPa. From 0 to 300 K, B (T) is regular and smooth, evincing no phase transition (electronic, magnetic, structural). The bulk modulus decreases to 54.4 GPa, about 30%, a very large change compared with typical materials. We attribute this large decrease to electron localization during warming. High-temperature dBdT yields a Gruneisen parameter γ=5.1, too high we believe because of temperature-induced electron localization. From the low-temperature elastic constants, averaged in the usual Debye v-3 manner, we obtain a Debye temperature ΘD =205 K.
AB - Using resonant-ultrasound spectroscopy, we measured alpha-plutonium's bulk modulus B between 298 and 18 K. Fitting the measurements to an Einstein-oscillator-based function gave the zero-temperature bulk modulus Bo =70.9 GPa. We compare our measurement with numerous previous measurements and with numerous theoretical estimates ranging from 41 to 227 GPa. From 0 to 300 K, B (T) is regular and smooth, evincing no phase transition (electronic, magnetic, structural). The bulk modulus decreases to 54.4 GPa, about 30%, a very large change compared with typical materials. We attribute this large decrease to electron localization during warming. High-temperature dBdT yields a Gruneisen parameter γ=5.1, too high we believe because of temperature-induced electron localization. From the low-temperature elastic constants, averaged in the usual Debye v-3 manner, we obtain a Debye temperature ΘD =205 K.
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U2 - 10.1103/PhysRevB.71.172101
DO - 10.1103/PhysRevB.71.172101
M3 - Article
AN - SCOPUS:33344466024
SN - 1098-0121
VL - 71
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 17
M1 - 172101
ER -