Thermodynamic assessment of the neptunium–oxygen system: Mass spectrometric studies and thermodynamic modelling

A.L. Smith, J.-Y. Colle, O. Beneš, R.J.M. Konings, B. Sundman, C. Guéneau

The Journal of Chemical Thermodynamics 103 257-275 (2016) · Elsevier BV

DOI: 10.1016/j.jct.2016.07.040

Data: JSON record · id doi:10.1016/j.jct.2016.07.040 · metadata: crossref

Roles in ORCHID

• read by ORCHID (values extracted): 57 released values
• assessment behind a TDB file: NpO-16Smi.tdb (Np–O)
• discovery lead (found by Crossref assessment discovery, not read): rank 798, score 100; systems named in title: none

Systems

Np, Np–O, La–Np–O–Y

Evidence in ORCHID

57 values read from this paper (50 accepted), from 6 tables and 10 text passages.

Phase-registry phases citing it: phase:np-o:ad-tetrag, phase:np-o:bcc-a2, phase:np-o:gas, phase:np-o:ion, phase:np-o:liquid, phase:np-o:np2o5, phase:np-o:npo2-c1, phase:np-o:o2gas, phase:np-o:ortho-ac

Availability

Read by ORCHID: yes (values_extracted). Open-access licence (Crossref license field): http://creativecommons.org/licenses/by-nc-nd/4.0/ (vor). Crossref is-referenced-by count: 13 (retrieved 2026-10-23).

Relations

Cited by (Crossref reference lists) (4)

• The SGTE collection of binary datasets (2025) [crossref_reference_list]
• Thermodynamic modelling of thoria-urania and thoria-plutonia fuels: Description of the Th-U-Pu-O quaternary system (2018) [crossref_reference_list]
• Study of the influence of americium on thermodynamic and structural properties of (U,Pu)O2±x mixed oxides (2026) [crossref_reference_list]
• Study of the U-Am-O ternary phase diagram (2026) [crossref_reference_list]

References (Crossref, publisher-deposited) (17)

• The thermodynamics of vaporization of neptunium and plutonium (1975) [crossref_reference_list]
• Phase relationships in the neptunium-oxygen system (1987) [crossref_reference_list]
• The Thermo-Calc databank system (1985) [crossref_reference_list]
• SGTE data for pure elements (1991) [crossref_reference_list]
• Thermodynamic modelling of the plutonium–oxygen system (2008) [crossref_reference_list]
• Calphad thermodynamic description of some binary systems involving U (2011) [crossref_reference_list]
• A thermodynamic study of the Pu–Am–O system (2011) [crossref_reference_list]
• Thermodynamic modelling of advanced oxide and carbide nuclear fuels: Description of the U–Pu–O–C systems (2011) [crossref_reference_list]
• Thermodynamic modelling and phase stability assessment of MO2− oxides with a fluorite structure (2003) [crossref_reference_list]
• Thermodynamic assessment of the uranium–oxygen system (2002) [crossref_reference_list]
• Enthalpy of formation of neptunium dioxide (1968) [crossref_reference_list]
• The Entropy and Low Temperature Heat Capacity of Neptunium Dioxide (1953) [crossref_reference_list]
• The Thermodynamic Properties of the f-Elements and Their Compounds. I. The Lanthanide and Actinide Metals (2010) [crossref_reference_list]
• Revisiting the melting temperature of NpO2 and the challenges associated with high temperature actinide compound measurements (2012) [crossref_reference_list]
• The Thermodynamic Properties of the <i>f</i>-Elements and their Compounds. Part 2. The Lanthanide and Actinide Oxides (2014) [crossref_reference_list]
• Specific heats of plutonium and neptunium (1970) [crossref_reference_list]
• Thermochemistry of a Few Neptunium and Neodymium Oxides and Hydroxides (1994) [crossref_reference_list]

Cites (values carry this citation) (11)

• The Thermodynamic Properties of the <i>f</i>-Elements and their Compounds. Part 2. The Lanthanide and Actinide Oxides (2014) — 15 values [orchid_extraction]
• The thermodynamics of vaporization of neptunium and plutonium (1975) — 8 values [orchid_extraction]
• The Thermodynamic Properties of the f-Elements and Their Compounds. I. The Lanthanide and Actinide Metals (2010) — 5 values [orchid_extraction]
• Specific heats of plutonium and neptunium (1970) — 3 values [orchid_extraction]
• Thermochemistry of a Few Neptunium and Neodymium Oxides and Hydroxides (1994) — 3 values [orchid_extraction]
• Enthalpy of formation of neptunium dioxide (1968) — 2 values [orchid_extraction]
• The Entropy and Low Temperature Heat Capacity of Neptunium Dioxide (1953) — 2 values [orchid_extraction]
• Phase relationships in the neptunium-oxygen system (1987) — 1 values [orchid_extraction]
• A thermodynamic study of the Pu–Am–O system (2011) — 1 values [orchid_extraction]
• Thermodynamic modelling and phase stability assessment of MO2− oxides with a fluorite structure (2003) — 1 values [orchid_extraction]
• Revisiting the melting temperature of NpO2 and the challenges associated with high temperature actinide compound measurements (2012) — 1 values [orchid_extraction]

TDB files modelling its system (2)

• tdb:NpO-16Smi.tdb [orchid_literature_model_link]
• tdb:NpO-16Smi.tdb [sgte_tdb_header]

Data papers used (11)

• The Thermodynamic Properties of the <i>f</i>-Elements and their Compounds. Part 2. The Lanthanide and Actinide Oxides (2014) — 15 values [orchid_extraction]
• The thermodynamics of vaporization of neptunium and plutonium (1975) — 8 values [orchid_extraction]
• The Thermodynamic Properties of the f-Elements and Their Compounds. I. The Lanthanide and Actinide Metals (2010) — 5 values [orchid_extraction]
• Specific heats of plutonium and neptunium (1970) — 3 values [orchid_extraction]
• Thermochemistry of a Few Neptunium and Neodymium Oxides and Hydroxides (1994) — 3 values [orchid_extraction]
• Enthalpy of formation of neptunium dioxide (1968) — 2 values [orchid_extraction]
• The Entropy and Low Temperature Heat Capacity of Neptunium Dioxide (1953) — 2 values [orchid_extraction]
• Phase relationships in the neptunium-oxygen system (1987) — 1 values [orchid_extraction]
• A thermodynamic study of the Pu–Am–O system (2011) — 1 values [orchid_extraction]
• Thermodynamic modelling and phase stability assessment of MO2− oxides with a fluorite structure (2003) — 1 values [orchid_extraction]
• Revisiting the melting temperature of NpO2 and the challenges associated with high temperature actinide compound measurements (2012) — 1 values [orchid_extraction]