Sublimation studies of NpF sub 4

Journal Article · Sat Aug 01 04:00:00 EDT 1992 · Journal of Chemical Physics; (United States)

DOI:https://doi.org/10.1063/1.463131· OSTI ID:7271852

Kleinschmidt, P D ^[1]; Lau, K H; Hildenbrand, D L ^[2]

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1. Nuclear Materials Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
2. SRI International, Menlo Park, California 94025 (United States)

The sublimation reaction NpF{sub 4}({ital s}) = NpF{sub 4}({ital g}) was measured over the range 820--980 K using Knudsen effusion mass spectrometry. The ionization potential of NpF{sub 4}({ital g}) is 10.4 +/{minus}0.3 eV. The enthalpy of sublimation from second law analysis is 288.1+/{minus}10.0 kJ mol{sup {minus}1}, while the second law entropy of sublimation is 199.1+/{minus}11.0 J K{sup {minus}1} mol{sup {minus}1}, both at 298 K. The calculated enthalpy of formation of NpF{sub 4}({ital g}) is {minus}1585.9+/{minus}17.0 kJ mol{sup {minus}1} and the entropy is 351.8+/{minus}12.0 J K{sup {minus}1} mol{sup {minus}1} at 298 K.

• OSTI ID: 7271852
• Journal Information: Journal of Chemical Physics; (United States), Journal Name: Journal of Chemical Physics; (United States) Vol. 97:3; ISSN JCPSA; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602 -- Other Materials-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ACTINIDE COMPOUNDS
CHEMICAL REACTIONS
ENTHALPY
ENTROPY
EVAPORATION
FLUID FLOW
FLUORIDES
FLUORINE COMPOUNDS
GAS FLOW
HALIDES
HALOGEN COMPOUNDS
IONIZATION POTENTIAL
KNUDSEN FLOW
MASS SPECTROSCOPY
NEPTUNIUM COMPOUNDS
NEPTUNIUM FLUORIDES
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
SPECTROSCOPY
SUBLIMATION
SUBLIMATION HEAT
TEMPERATURE RANGE
TEMPERATURE RANGE 0400-1000 K
THERMODYNAMIC PROPERTIES
THERMODYNAMICS
TRANSITION HEAT
TRANSURANIUM COMPOUNDS