UN: enthalpy of formation

94 accepted literature formation-enthalpy value(s) (experimental 8, model 86); experimental median -146.858 kJ/mol-atom (n = 8); Materials Project -143.768 kJ/mol-atom (mp-aaaaactt); OQMD -136.591 kJ/mol-atom (oqmd-4568).

Systems: N–U

Literature values

Enthalpy of formation of UN reported in the literature (94)
Value	Phase as printed	T (K)	Class	System	Source	Location
-148.433 kJ/mol-atom	N0.500U0.500(fcc_B1)	298.15	experimental	N–U	[1] Chevalier 2000 cites Oetting 1972 doi	Table 8, p. 6, row 6 report
-148.428 kJ/mol-atom	N0.500U0.500(fcc_B1)	298.15	experimental	N–U	[1] Chevalier 2000 cites Hubbard 1962	Table 8, p. 6, row 5 report
-147.904 kJ/mol-atom	N0.500U0.500(fcc_B1)	298.15	experimental	N–U	[1] Chevalier 2000 cites Tagawa 1974	Table 8, p. 6, row 8 report
-147.068 kJ/mol-atom	N0.500U0.500(fcc_B1)	298.15	experimental	N–U	[1] Chevalier 2000 cites Gross 1962	Table 8, p. 6, row 3 report
-146.649 kJ/mol-atom	N0.500U0.500(fcc_B1)	298.15	experimental	N–U	[1] Chevalier 2000 cites Gross 1962	Table 8, p. 6, row 4 report
-145.603 kJ/mol-atom	N0.500U0.500(fcc_B1)	298.15	experimental	N–U	[1] Chevalier 2000 cites Gross 1962	Table 8, p. 6, row 2 report
-145.368 kJ/mol-atom	N0.500U0.500(fcc_B1)	298.15	experimental	N–U	[1] Chevalier 2000 cites Johnson 1981 doi	Table 8, p. 6, row 7 report
-143.302 kJ/mol-atom	N0.500U0.500(fcc_B1)	298.15	experimental	N–U	[1] Chevalier 2000 cites Neumann 1932 doi	Table 8, p. 6, row 1 report
-306.95 kJ/mol (basis unstated)	UN(fcc_B1)	1500	model	N–U	[1] Chevalier 2000 cites Matsui 1987	Table 7, p. 5, row 41 report
-306.863 kJ/mol (basis unstated)	UN(fcc_B1)	1600	model	N–U	[1] Chevalier 2000 cites Matsui 1987	Table 7, p. 5, row 44 report
-306.677 kJ/mol (basis unstated)	UN(fcc_B1)	1700	model	N–U	[1] Chevalier 2000 cites Matsui 1987	Table 7, p. 5, row 47 report
-306.562 kJ/mol (basis unstated)	UN(fcc_B1)	1500	model	N–U	[1] Chevalier 2000 cites Tagawa 1974	Table 7, p. 5, row 40 report
-306.311 kJ/mol (basis unstated)	UN(fcc_B1)	1600	model	N–U	[1] Chevalier 2000 cites Tagawa 1974	Table 7, p. 5, row 43 report
-306.211 kJ/mol (basis unstated)	UN(fcc_B1)	1700	model	N–U	[1] Chevalier 2000	Table 7, p. 5, row 48 report
-306.166 kJ/mol (basis unstated)	UN(fcc_B1)	1600	model	N–U	[1] Chevalier 2000	Table 7, p. 5, row 45 report
-306.092 kJ/mol (basis unstated)	UN(fcc_B1)	1800	model	N–U	[1] Chevalier 2000	Table 7, p. 5, row 51 report
-306 kJ/mol (basis unstated)	UN(fcc_B1)	1900	model	N–U	[1] Chevalier 2000 cites Matsui 1987	Table 7, p. 5, row 53 report
-305.997 kJ/mol (basis unstated)	UN(fcc_B1)	1500	model	N–U	[1] Chevalier 2000	Table 7, p. 5, row 42 report
-305.892 kJ/mol (basis unstated)	UN(fcc_B1)	1700	model	N–U	[1] Chevalier 2000 cites Tagawa 1974	Table 7, p. 5, row 46 report
-305.771 kJ/mol (basis unstated)	UN(fcc_B1)	1900	model	N–U	[1] Chevalier 2000	Table 7, p. 5, row 54 report
-305.507 kJ/mol (basis unstated)	UN(fcc_B1)	2000	model	N–U	[1] Chevalier 2000 cites Matsui 1987	Table 7, p. 5, row 56 report
-305.348 kJ/mol (basis unstated)	UN(fcc_B1)	1800	model	N–U	[1] Chevalier 2000 cites Tagawa 1974	Table 7, p. 5, row 49 report
-305.208 kJ/mol (basis unstated)	UN(fcc_B1)	2000	model	N–U	[1] Chevalier 2000	Table 7, p. 5, row 57 report
-304.91 kJ/mol (basis unstated)	UN(fcc_B1)	2100	model	N–U	[1] Chevalier 2000 cites Matsui 1987	Table 7, p. 5, row 59 report
-304.734 kJ/mol (basis unstated)	UN(fcc_B1)	1800	model	N–U	[1] Chevalier 2000 cites Matsui 1987	Table 7, p. 5, row 50 report
-304.595 kJ/mol (basis unstated)	UN(fcc_B1)	1900	model	N–U	[1] Chevalier 2000 cites Tagawa 1974	Table 7, p. 5, row 52 report
-304.366 kJ/mol (basis unstated)	UN(fcc_B1)	2100	model	N–U	[1] Chevalier 2000	Table 7, p. 5, row 60 report
-304.211 kJ/mol (basis unstated)	UN(fcc_B1)	2200	model	N–U	[1] Chevalier 2000 cites Matsui 1987	Table 7, p. 5, row 62 report
-303.675 kJ/mol (basis unstated)	UN(fcc_B1)	2000	model	N–U	[1] Chevalier 2000 cites Tagawa 1974	Table 7, p. 5, row 55 report
-303.405 kJ/mol (basis unstated)	UN(fcc_B1)	2300	model	N–U	[1] Chevalier 2000 cites Matsui 1987	Table 7, p. 5, row 65 report
-303.205 kJ/mol (basis unstated)	UN(fcc_B1)	2200	model	N–U	[1] Chevalier 2000	Table 7, p. 5, row 63 report
-302.587 kJ/mol (basis unstated)	UN(fcc_B1)	2100	model	N–U	[1] Chevalier 2000 cites Tagawa 1974	Table 7, p. 5, row 58 report
-302.491 kJ/mol (basis unstated)	UN(fcc_B1)	2400	model	N–U	[1] Chevalier 2000 cites Matsui 1987	Table 7, p. 5, row 68 report
-301.686 kJ/mol (basis unstated)	UN(fcc_B1)	2300	model	N–U	[1] Chevalier 2000	Table 7, p. 5, row 66 report
-301.474 kJ/mol (basis unstated)	UN(fcc_B1)	2500	model	N–U	[1] Chevalier 2000 cites Matsui 1987	Table 7, p. 5, row 71 report
-301.248 kJ/mol (basis unstated)	UN(fcc_B1)	2200	model	N–U	[1] Chevalier 2000 cites Tagawa 1974	Table 7, p. 5, row 61 report
-300.83 kJ/mol (basis unstated)	UN(fcc_B1)	1100	model	N–U	[1] Chevalier 2000 cites Tagawa 1974	Table 7, p. 5, row 28 report
-300.579 kJ/mol (basis unstated)	UN(fcc_B1)	1200	model	N–U	[1] Chevalier 2000 cites Tagawa 1974	Table 7, p. 5, row 31 report
-300.383 kJ/mol (basis unstated)	UN(fcc_B1)	1100	model	N–U	[1] Chevalier 2000 cites Matsui 1987	Table 7, p. 5, row 29 report
-300.244 kJ/mol (basis unstated)	UN(fcc_B1)	1300	model	N–U	[1] Chevalier 2000 cites Tagawa 1974	Table 7, p. 5, row 34 report
-299.771 kJ/mol (basis unstated)	UN(fcc_B1)	2400	model	N–U	[1] Chevalier 2000	Table 7, p. 5, row 69 report
-299.742 kJ/mol (basis unstated)	UN(fcc_B1)	2300	model	N–U	[1] Chevalier 2000 cites Tagawa 1974	Table 7, p. 5, row 64 report
-299.742 kJ/mol (basis unstated)	UN(fcc_B1)	1400	model	N–U	[1] Chevalier 2000 cites Tagawa 1974	Table 7, p. 5, row 37 report
-299.644 kJ/mol (basis unstated)	UN(fcc_B1)	1200	model	N–U	[1] Chevalier 2000 cites Matsui 1987	Table 7, p. 5, row 32 report
-298.882 kJ/mol (basis unstated)	UN(fcc_B1)	1100	model	N–U	[1] Chevalier 2000	Table 7, p. 5, row 30 report
-298.809 kJ/mol (basis unstated)	UN(fcc_B1)	1300	model	N–U	[1] Chevalier 2000 cites Matsui 1987	Table 7, p. 5, row 35 report
-298.135 kJ/mol (basis unstated)	UN(fcc_B1)	1200	model	N–U	[1] Chevalier 2000	Table 7, p. 5, row 33 report
-298.026 kJ/mol (basis unstated)	UN(fcc_B1)	2400	model	N–U	[1] Chevalier 2000 cites Tagawa 1974	Table 7, p. 5, row 67 report
-297.881 kJ/mol (basis unstated)	UN(fcc_B1)	1400	model	N–U	[1] Chevalier 2000 cites Matsui 1987	Table 7, p. 5, row 38 report
-297.418 kJ/mol (basis unstated)	UN(fcc_B1)	2500	model	N–U	[1] Chevalier 2000	Table 7, p. 5, row 72 report
-297.414 kJ/mol (basis unstated)	UN(fcc_B1)	1300	model	N–U	[1] Chevalier 2000	Table 7, p. 5, row 36 report
-296.682 kJ/mol (basis unstated)	UN(fcc_B1)	1400	model	N–U	[1] Chevalier 2000	Table 7, p. 5, row 39 report
-296.395 kJ/mol (basis unstated)	UN(fcc_B1)	1000	model	N–U	[1] Chevalier 2000 cites Tagawa 1974	Table 7, p. 5, row 25 report
-296.06 kJ/mol (basis unstated)	UN(fcc_B1)	2500	model	N–U	[1] Chevalier 2000 cites Tagawa 1974	Table 7, p. 5, row 70 report
-296.05 kJ/mol (basis unstated)	UN(fcc_B1)	1000	model	N–U	[1] Chevalier 2000 cites Matsui 1987	Table 7, p. 5, row 26 report
-295.809 kJ/mol (basis unstated)	UN(fcc_B1)	298.15	model	N–U	[1] Chevalier 2000 cites Matsui 1987	Table 7, p. 5, row 2 report
-295.809 kJ/mol (basis unstated)	UN(fcc_B1)	300	model	N–U	[1] Chevalier 2000 cites Tagawa 1974	Table 7, p. 5, row 4 report
-295.809 kJ/mol (basis unstated)	UN(fcc_B1)	298.15	model	N–U	[1] Chevalier 2000 cites Tagawa 1974	Table 7, p. 5, row 1 report
-295.798 kJ/mol (basis unstated)	UN(fcc_B1)	300	model	N–U	[1] Chevalier 2000 cites Matsui 1987	Table 7, p. 5, row 5 report
-295.136 kJ/mol (basis unstated)	UN(fcc_B1)	400	model	N–U	[1] Chevalier 2000 cites Matsui 1987	Table 7, p. 5, row 8 report
-295.056 kJ/mol (basis unstated)	UN(fcc_B1)	400	model	N–U	[1] Chevalier 2000 cites Tagawa 1974	Table 7, p. 5, row 7 report
-294.775 kJ/mol (basis unstated)	UN(fcc_B1)	3000	model	N–U	[1] Chevalier 2000 cites Matsui 1987	Table 7, p. 5, row 83 report
-294.705 kJ/mol (basis unstated)	UN(fcc_B1)	1000	model	N–U	[1] Chevalier 2000	Table 7, p. 5, row 27 report
-294.591 kJ/mol (basis unstated)	UN(fcc_B1)	2600	model	N–U	[1] Chevalier 2000	Table 7, p. 5, row 74 report
-294.414 kJ/mol (basis unstated)	UN(fcc_B1)	500	model	N–U	[1] Chevalier 2000 cites Matsui 1987	Table 7, p. 5, row 11 report
-294.354 kJ/mol (basis unstated)	UN(fcc_B1)	298.15	model	N–U	[1] Chevalier 2000 cites THERMODATA	Table 12, p. 10, row 2 report
-294.353 kJ/mol (basis unstated)	UN(fcc_B1)	298.15	model	N–U	[1] Chevalier 2000	Table 7, p. 5, row 3 report
-294.353 kJ/mol (basis unstated)	UN(fcc_B1)	300	model	N–U	[1] Chevalier 2000	Table 7, p. 5, row 6 report
-294.261 kJ/mol (basis unstated)	UN(fcc_B1)	500	model	N–U	[1] Chevalier 2000 cites Tagawa 1974	Table 7, p. 5, row 10 report
-293.842 kJ/mol (basis unstated)	UN(fcc_B1)	2600	model	N–U	[1] Chevalier 2000 cites Tagawa 1974	Table 7, p. 5, row 73 report
-293.773 kJ/mol (basis unstated)	UN(fcc_B1)	600	model	N–U	[1] Chevalier 2000 cites Matsui 1987	Table 7, p. 5, row 14 report
-293.697 kJ/mol (basis unstated)	UN(fcc_B1)	400	model	N–U	[1] Chevalier 2000	Table 7, p. 5, row 9 report
-293.675 kJ/mol (basis unstated)	UN(fcc_B1)	600	model	N–U	[1] Chevalier 2000 cites Tagawa 1974	Table 7, p. 5, row 13 report
-293.382 kJ/mol (basis unstated)	UN(fcc_B1)	700	model	N–U	[1] Chevalier 2000 cites Tagawa 1974	Table 7, p. 5, row 16 report
-293.382 kJ/mol (basis unstated)	UN(fcc_B1)	900	model	N–U	[1] Chevalier 2000 cites Tagawa 1974	Table 7, p. 5, row 22 report
-293.305 kJ/mol (basis unstated)	UN(fcc_B1)	700	model	N–U	[1] Chevalier 2000 cites Matsui 1987	Table 7, p. 5, row 17 report
-293.298 kJ/mol (basis unstated)	UN(fcc_B1)	800	model	N–U	[1] Chevalier 2000 cites Tagawa 1974	Table 7, p. 5, row 19 report
-293.18 kJ/mol (basis unstated)	UN(fcc_B1)	900	model	N–U	[1] Chevalier 2000 cites Matsui 1987	Table 7, p. 5, row 23 report
-293.089 kJ/mol (basis unstated)	UN(fcc_B1)	800	model	N–U	[1] Chevalier 2000 cites Matsui 1987	Table 7, p. 5, row 20 report
-293.061 kJ/mol (basis unstated)	UN(fcc_B1)	500	model	N–U	[1] Chevalier 2000	Table 7, p. 5, row 12 report
-292.566 kJ/mol (basis unstated)	UN(fcc_B1)	600	model	N–U	[1] Chevalier 2000	Table 7, p. 5, row 15 report
-292.247 kJ/mol (basis unstated)	UN(fcc_B1)	700	model	N–U	[1] Chevalier 2000	Table 7, p. 5, row 18 report
-292.108 kJ/mol (basis unstated)	UN(fcc_B1)	900	model	N–U	[1] Chevalier 2000	Table 7, p. 5, row 24 report
-292.101 kJ/mol (basis unstated)	UN(fcc_B1)	800	model	N–U	[1] Chevalier 2000	Table 7, p. 5, row 21 report
-291.374 kJ/mol (basis unstated)	UN(fcc_B1)	2700	model	N–U	[1] Chevalier 2000 cites Tagawa 1974	Table 7, p. 5, row 75 report
-291.249 kJ/mol (basis unstated)	UN(fcc_B1)	2700	model	N–U	[1] Chevalier 2000	Table 7, p. 5, row 76 report
-288.696 kJ/mol (basis unstated)	UN(fcc_B1)	2800	model	N–U	[1] Chevalier 2000 cites Tagawa 1974	Table 7, p. 5, row 77 report
-287.353 kJ/mol (basis unstated)	UN(fcc_B1)	2800	model	N–U	[1] Chevalier 2000	Table 7, p. 5, row 78 report
-286.669 kJ/mol (basis unstated)	UN(fcc_B1)	2900	model	N–U	[1] Chevalier 2000 cites Matsui 1987	Table 7, p. 5, row 80 report
-285.725 kJ/mol (basis unstated)	UN(fcc_B1)	2900	model	N–U	[1] Chevalier 2000 cites Tagawa 1974	Table 7, p. 5, row 79 report
-282.864 kJ/mol (basis unstated)	UN(fcc_B1)	2900	model	N–U	[1] Chevalier 2000	Table 7, p. 5, row 81 report
-282.462 kJ/mol (basis unstated)	UN(fcc_B1)	3000	model	N–U	[1] Chevalier 2000 cites Tagawa 1974	Table 7, p. 5, row 82 report
-277.743 kJ/mol (basis unstated)	UN(fcc_B1)	3000	model	N–U	[1] Chevalier 2000	Table 7, p. 5, row 84 report
-147.176 kJ/mol-atom	N0.500U0.500(fcc_B1)	298.15	model	N–U	[1] Chevalier 2000	Table 8, p. 6, row 9 report

Uncertainty budget

Components kept separate, in the value's unit (literature SCHEMA.md, UNCERTAINTY_CALIBRATION.md): effective = max(sqrt(max(printed, reading, method)^2 + composition^2 + conversion^2), scatter). The method floor is the robust between-study scatter of the method class in ORCHID (calibrated) or a documented prior; printed values and printed uncertainties are unchanged.

Uncertainty budget of the literature values of UN
Value	Unit	Reading	Method (class, basis)	Effective
-148.433	kJ/mol-atom	5.000e-5	3.5 (unknown, calibrated)	3.5
-148.428	kJ/mol-atom	5.000e-5	3.5 (unknown, calibrated)	3.5
-147.904	kJ/mol-atom	5.000e-5	3.5 (unknown, calibrated)	3.5
-147.068	kJ/mol-atom	5.000e-5	3.5 (unknown, calibrated)	3.5
-146.649	kJ/mol-atom	5.000e-5	3.5 (unknown, calibrated)	3.5
-145.603	kJ/mol-atom	5.000e-5	3.5 (unknown, calibrated)	3.5
-145.368	kJ/mol-atom	5.000e-5	3.5 (unknown, calibrated)	3.5
-143.302	kJ/mol-atom	5.000e-5	3.5 (unknown, calibrated)	3.5
-306.95	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-306.863	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-306.677	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-306.562	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-306.311	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-306.211	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-306.166	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-306.092	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-306	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-305.997	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-305.892	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-305.771	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-305.507	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-305.348	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-305.208	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-304.91	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-304.734	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-304.595	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-304.366	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-304.211	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-303.675	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-303.405	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-303.205	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-302.587	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-302.491	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-301.686	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-301.474	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-301.248	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-300.83	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-300.579	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-300.383	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-300.244	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-299.771	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-299.742	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-299.742	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-299.644	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-298.882	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-298.809	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-298.135	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-298.026	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-297.881	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-297.418	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-297.414	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-296.682	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-296.395	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-296.06	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-296.05	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-295.809	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-295.809	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-295.809	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-295.798	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-295.136	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-295.056	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-294.775	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-294.705	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-294.591	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-294.414	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-294.354	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-294.353	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-294.353	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-294.261	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-293.842	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-293.773	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-293.697	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-293.675	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-293.382	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-293.382	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-293.305	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-293.298	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-293.18	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-293.089	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-293.061	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-292.566	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-292.247	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-292.108	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-292.101	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-291.374	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-291.249	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-288.696	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-287.353	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-286.669	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-285.725	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-282.864	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-282.462	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-277.743	kJ/mol (basis unstated)	5.000e-4	7.8 (model_calculated, calibrated)	7.8
-147.176	kJ/mol-atom	5.000e-5	3.9 (model_calculated, calibrated)	3.9

DFT formation energies

Lowest-energy entries at this composition. Materials Project and OQMD use different energy references and are never averaged. 1 eV/atom = 96.485 kJ/mol-atom.

DFT formation energy of UN
Source	Entry	kJ/mol-atom	eV/atom	Space group	E above hull (kJ/mol-atom)	E above hull (eV/atom)	Theoretical
Materials Project	mp-aaaaactt	-143.768	-1.49006	Fm-3m	0	0	no
OQMD	oqmd-4568	-136.591	-1.41567	Fm-3m	0	0	no

DFT sources: A. Jain et al., Commentary: The Materials Project: A materials genome approach to accelerating materials innovation, APL Materials 1 (2013) 011002. doi:10.1063/1.4812323 (CC BY 4.0); J. E. Saal et al., JOM 65 (2013) 1501-1509; S. Kirklin et al., npj Comput. Mater. 1 (2015) 15010. doi:10.1007/s11837-013-0755-4 (CC BY 4.0);

Sources

P.-Y. Chevalier, E. Fischer, B. Cheynet, Thermodynamic modelling of the N–U system, Journal of Nuclear Materials 280, 136-150 (2000). doi:10.1016/s0022-3115(00)00043-x

Please cite

R. Arróyave, J. Saal, D. Shin, ORCHID-Values: thermodynamic and phase-equilibrium values read from the literature (version 2026.10; Version 1, machine-extracted), Zenodo (2026). doi:10.5281/zenodo.23735569
R. Arróyave, J. Saal, D. Shin, ORCHID-Parity: DFT-vs-experiment formation-enthalpy benchmark (version 2026.10; Version 1, machine-extracted), Zenodo (2026). doi:10.5281/zenodo.23735943
R. Arróyave, J. Saal, D. Shin, ORCHID data: umbrella record of the ORCHID datasets (version 2026.10; Version 1, machine-extracted), Zenodo (2026). doi:10.5281/zenodo.23736065

Also cite the original source of every value you use (paper_citation / paper_doi, and cited_dois for values the paper cites from earlier work); A. Jain et al., The Materials Project: A materials genome approach to accelerating materials innovation, APL Materials 1 (2013) 011002, https://doi.org/10.1063/1.4812323 (CC BY 4.0); J. E. Saal et al., JOM 65 (2013) 1501, https://doi.org/10.1007/s11837-013-0755-4 and S. Kirklin et al., npj Comput. Mater. 1 (2015) 15010, https://doi.org/10.1038/npjcompumats.2015.10 (CC BY 4.0); G. Kim, S. V. Meschel, P. Nash, W. Chen, Experimental formation enthalpies for intermetallic phases and other inorganic compounds, Scientific Data 4 (2017) 170162, https://doi.org/10.1038/sdata.2017.162; B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, https://doi.org/10.1016/j.calphad.2025.102833 (CC BY 4.0), and the original assessment named in each file. Version 1, machine-extracted: values were read by language-model readers constrained to quote their source and checked automatically, and the release was then audited on the printed pages by adversarial audits, an independent second review of fit-facing records and a preliminary human review of a frozen sample. Flags such as accepted and ESPEI-ready record screening results, not certification; known issues are listed in the release notes.

@misc{orchid_literature_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Values: thermodynamic and phase-equilibrium values read from the literature}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735569},
  url       = {https://doi.org/10.5281/zenodo.23735569},
  note      = {Version 1, machine-extracted}
}

@misc{orchid_dft_benchmark_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Parity: DFT-vs-experiment formation-enthalpy benchmark}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735943},
  url       = {https://doi.org/10.5281/zenodo.23735943},
  note      = {Version 1, machine-extracted}
}

@misc{orchid_data_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID data: umbrella record of the ORCHID datasets}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23736065},
  url       = {https://doi.org/10.5281/zenodo.23736065},
  note      = {Version 1, machine-extracted}
}