04_03_86 - TABLE 1 Data for the Trivalent Ions of the Rare...

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Unformatted text preview: TABLE 1. Data for the Trivalent Ions of the Rare Earth Elements Rare earth Symbol Atomic no. Atomic wt. a Electronic configuration for R 3+ Spectroscopic ground state symbol No. 4f electrons S L J Scandium Sc 21 44.955910 — — — — Yttrium Y 39 88.90585 — — — — Lanthanum La 57 138.9055 — — — — Cerium Ce 58 140.115 1 1/2 3 5/2 2 F 5/2 Praseodymium Pr 59 140.90765 2 1 5 4 3 H 4 Neodymium Nd 60 144.24 3 3/2 6 9/2 4 I 9/2 Promethium Pm 61 (145) 4 2 6 4 5 I 4 Samarium Sm 62 150.36 5 5/2 5 5/2 6 H 5/2 Europium Eu 63 151.965 6 3 3 7 F Gadolinium Gd 64 157.25 7 7/2 7/2 8 S 7/2 Terbium Tb 65 158.92534 8 3 3 6 7 F 6 Dysprosium Dy 66 162.50 9 5/2 5 15/2 6 H 15/2 Holmium Ho 67 164.93032 10 2 6 8 5 I 8 Erbium Er 68 167.26 11 3/2 6 15/2 4 I 15/2 Thulium Tm 69 168.93421 12 1 5 6 3 H 6 Ytterbium Yb 70 173.04 13 1/2 3 7/2 2 F 7/2 Lutetium Lu 71 174.967 14 — — — — Note: For additional information, see Goldschmidt, Z.B., in Handbook on the Physics and Chemistry of Rare Earths, Vol. 1, Gschneidner, K.A., Jr. and Eyring, L., Eds., North-Holland Physics, Amsterdam, 1978; DeLaeter, J.R., and Heumann, K.G., J. Phys. Chem. Ref. Data, 20, 1313 , 1991; Pure Appl. Chem., 66, 2423, 1994. a 1993 standard atomic weights. TABLE 2. Crystallographic Data for the Rare Earth Metals at 24°C (297 K) or Below Rare earth metal Crystal structure a Lattice constants (Å) Metallic radius CN = 12 (Å) Atomic volume (cm 3 /mol) Density (g/cm 3 ) a o b o c o αSc hcp 3.3088 — 5.2680 1.6406 15.039 2.989 αY hcp 3.6482 — 5.7318 1.8012 19.893 4.469 αLa dhcp 3.7740 — 12.171 1.8791 22.602 6.146 αCe b fcc 4.85 b — — 1.72 b 17.2 b 8.16 b βCe dhcp 3.6810 — 11.857 1.8321 20.947 6.689 γCe c fcc 5.1610 — — 1.8247 20.696 6.770 αPr dhcp 3.6721 — 11.8326 1.8279 20.803 6.773 αNd dhcp 3.6582 — 11.7966 1.8214 20.583 7.008 αPm dhcp 3.65 — 11.65 1.811 20.24 7.264 αSm rhomb d 3.6290 d — 26.207 1.8041 20.000 7.520 Eu bcc 4.5827 — — 2.0418 28.979 5.244 αGd hcp 3.6336 — 5.7810 1.8013 19.903 7.901 α ′ Tb e ortho 3.605 e 6.244 e 5.706 e 1.784 e 19.34 e 8.219 e αTb hcp 3.6055 — 5.6966 1.7833 19.310 8.230 α ′ Dy f ortho 3.595 f 6.184 f 5.678 f 1.774 f 19.00 f 8.551 f αDy hcp 3.5915 — 5.6501 1.7740 19.004 8.551 Ho hcp 3.5778 — 5.6178 1.7661 18.752 8.795 Er hcp 3.5592 — 5.5850 1.7566 18.449 9.066 Tm hcp 3.5375 — 5.5540 1.7462 18.124 9.321 αYb g hcp 3.8799 g — 6.3859 g 1.9451 g 25.067 g 6.903 g βYb fcc 5.4848 — — 1.9392 24.841 6.966 Lu hcp 3.5052 — 5.5494 1.7349 17.779 9.841 Note: For additional information, see Gschneidner, K.A., Jr. and Calderwood, F.W., in Handbook on the Physics and Chemistry of Rare Earths, Vol. 8, Gschneidner, K.A., Jr. and Eyring, L., Eds., North-Holland Physics, Amsterdam, 1986; Gschneidner, K.A., Jr., Pecharsky, V.K., Cho, Jaephil and Martin, S.W., Scripta Mater. , 1996, to be published....
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04_03_86 - TABLE 1 Data for the Trivalent Ions of the Rare...

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