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導入

原子番号: 63
グループ: なし
原子量: 151.964
期間: 6
CAS番号: 7440-53-3

分類

カルコゲン
ハロゲン
希ガス
ランタノイド元素
アクチノイド元素
希土類元素
プラチナグループメタル
超ウラン
いいえ安定同位体ません
固体
液体
ガス
固体 (予測)

説明 • 用途/機能

In 1890 Boisbaudranobtained basic fractions from samarium-gadolinium concentrates which had spark spectral lines not accounted for by samarium or gadolinium. Theselines subsequently have been shown to belong to europium. The discovery of europium is generally credited to Demarcay, who separated the rare earthin reasonably pure form in 1901. The pure metal was not isolated until recent years. Europium is now prepared by mixing Eu2O3 with a 10%-excessof lanthanum metal and heating the mixture in a tantalum crucible under high vacuum. The element is collected as a silvery-white metallic depositon the walls of the crucible. As with other rare-earth metals, except for lanthanum, europium ignites in air at about 150 to 180°C. Europium is aboutas hard as lead and is quite ductile. It is the most reactive of the rare-earth metals, quickly oxidizing in air. It resembles calcium in its reaction withwater. Bastnasite and monazite are the principal ores containing europium. Europium has been identified spectroscopically in the sun and certain stars.Europium isotopes are good neutron absorbers and are being studied for use in nuclear control applications. Europium oxide is now widely used asa phosphor activator and europium-activated yttrium vanadate is in commercial use as the red phosphor in color TV tubes. Europium-doped plastichas been used as a laser material. With the development of ion-exchange techniques and special processes, the cost of the metal has been greatly reducedin recent years. Natural europium contains two stable isotopes. Thirty five other radioactive isotopes and isomers are known. Europium is one of therarest and most costly of the rare-earth metals. It is priced at about $50/g (99.9% pure). 1

物理的特性

融点:2*  822 °C = 1095.15 K = 1511.6 °F
沸点:2* 1529 °C = 1802.15 K = 2784.2 °F
昇華点:2 
三重点:2 
臨界点:2 
密度:3  5.24 g/cm3

* - at 1 atm

電子構成

電子構成:  *[Xe] 6s2 4f7
ブロック: f
最高占有エネルギーレベル: 6
ヴァランス電子: 2

量子数:

n = 4
ℓ = 3
m = 3
ms = +½

ボンディング

仕事関数:4 2.50 eV = 4.005E-19 J

イオン化ポテンシャル   eV 5  kJ/mol  
1 5.6704    547.1
イオン化ポテンシャル   eV 5  kJ/mol  
2 11.241    1084.6
イオン化ポテンシャル   eV 5  kJ/mol  
3 24.92    2404.4
4 42.7    4119.9

熱化学

比熱: 0.182 J/g°C 6 = 27.657 J/mol°C = 0.043 cal/g°C = 6.610 cal/mol°C
熱伝導率: 13.9 (W/m)/K, 27°C 7
融解熱: 9.21 kJ/mol 8 = 60.6 J/g
気化熱: 143.5 kJ/mol 9 = 944.3 J/g
物質の状態 生成エンタルピー (ΔHf°)10 エントロピ (S°)10 ギブズ自由エネルギー (ΔGf°)10
(kcal/mol) (kJ/mol) (cal/K) (J/K) (kcal/mol) (kJ/mol)
(s) 0 0 18.59 77.78056 0 0
(g) 41.9 175.3096 45.10 188.6984 34.0 142.256

同位体

核種 質量 11 人生の半分 11 核スピン 11 結合エネルギー
130Eu 129.96357(54)# 1.1(5) ms [0.9(+5-3) ms] 2+# 1,037.24 MeV
131Eu 130.95775(43)# 17.8(19) ms 3/2+ 1,054.63 MeV
132Eu 131.95437(43)# 100# ms 1,062.70 MeV
133Eu 132.94924(32)# 200# ms 11/2-# 1,080.09 MeV
134Eu 133.94651(21)# 0.5(2) s 1,088.16 MeV
135Eu 134.94182(32)# 1.5(2) s 11/2-# 1,096.23 MeV
136Eu 135.93960(21)# 3.3(3) s (7+) 1,113.61 MeV
137Eu 136.93557(21)# 8.4(5) s 11/2-# 1,121.69 MeV
138Eu 137.93371(3) 12.1(6) s (6-) 1,129.76 MeV
139Eu 138.929792(14) 17.9(6) s (11/2)- 1,147.14 MeV
140Eu 139.92809(6) 1.51(2) s 1+ 1,155.21 MeV
141Eu 140.924931(14) 40.7(7) s 5/2+ 1,163.29 MeV
142Eu 141.92343(3) 2.36(10) s 1+ 1,171.36 MeV
143Eu 142.920298(12) 2.59(2) min 5/2+ 1,179.43 MeV
144Eu 143.918817(12) 10.2(1) s 1+ 1,196.81 MeV
145Eu 144.916265(4) 5.93(4) d 5/2+ 1,204.89 MeV
146Eu 145.917206(7) 4.61(3) d 4- 1,212.96 MeV
147Eu 146.916746(3) 24.1(6) d 5/2+ 1,221.03 MeV
148Eu 147.918086(11) 54.5(5) d 5- 1,229.10 MeV
149Eu 148.917931(5) 93.1(4) d 5/2+ 1,237.17 MeV
150Eu 149.919702(7) 36.9(9) a 5(-) 1,245.24 MeV
151Eu 150.9198502(26) 5E18 a 5/2+ 1,253.31 MeV
152Eu 151.9217445(26) 13.537(6) a 3- 1,252.07 MeV
153Eu 152.9212303(26) STABLE 5/2+ 1,260.14 MeV
154Eu 153.9229792(26) 8.593(4) a 3- 1,268.21 MeV
155Eu 154.9228933(27) 4.7611(13) a 5/2+ 1,276.28 MeV
156Eu 155.924752(6) 15.19(8) d 0+ 1,284.36 MeV
157Eu 156.925424(6) 15.18(3) h 5/2+ 1,292.43 MeV
158Eu 157.92785(8) 45.9(2) min (1-) 1,300.50 MeV
159Eu 158.929089(8) 18.1(1) min 5/2+ 1,308.57 MeV
160Eu 159.93197(22)# 38(4) s 1(-) 1,307.33 MeV
161Eu 160.93368(32)# 26(3) s 5/2+# 1,315.40 MeV
162Eu 161.93704(32)# 10.6(10) s 1,323.47 MeV
163Eu 162.93921(54)# 6# s 5/2+# 1,331.54 MeV
164Eu 163.94299(64)# 2# s 1,330.30 MeV
165Eu 164.94572(75)# 1# s 5/2+# 1,338.37 MeV
166Eu 165.94997(86)# 400# ms 1,346.44 MeV
167Eu 166.95321(86)# 200# ms 5/2+# 1,345.20 MeV
値は、#は、純粋に実験データから派生しますが、少なくとも部分的に体系的な傾向からしていないとマーク。弱い代入引数は括弧で囲まれていてスピン。 11

反応

豊富

地球 - ソース化合物: phosphates 13
地球 - 海水: 0.00000013 mg/L 14
地球 -  地殻:  2 mg/kg = 0.0002% 14
地球 -  合計:  79 ppb 15
マーキュリー(惑星) -  合計:  61 ppb 15
金星 -  合計:  83 ppb 15
コンドライト - 合計: 0.082 (relative to 106 atoms of Si) 16

化合物

安全情報


安全データシート - ACI Alloys, Inc.

詳細については

外部リンク:

マガジン:
(1) Folger, Tim. The Secret Ingredients of Everything. National Geographic, June 2011, pp 136-145.

ソース

(1) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; p 4:11-4:12.
(2) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; p 4:132.
(3) - Lide, David R. CRC Handbook of Chemistry and Physics, 84th ed.; CRC Press: Boca Raton, FL, 2002; p 4:39-4:96.
(4) - Dean, John A. Lange's Handbook of Chemistry, 11th ed.; McGraw-Hill Book Company: New York, NY, 1973; p 4:8-4:149.
(5) - Speight, James. Lange's Handbook of Chemistry, 16th ed.; McGraw-Hill Professional: Boston, MA, 2004; p 1:132.
(6) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; p 10:178 - 10:180.
(7) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; p 4:133.
(8) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; pp 6:193, 12:219-220.
(9) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; pp 6:123-6:137.
(10) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; pp 6:107-6:122.
(11) - Dean, John A. Lange's Handbook of Chemistry, 12th ed.; McGraw-Hill Book Company: New York, NY, 1979; p 9:4-9:94.
(12) - Atomic Mass Data Center. http://amdc.in2p3.fr/web/nubase_en.html (accessed July 14, 2009).
(13) - Zumdahl, Steven and Zumdahl, Susan A. Chemistry 9th ed.; Brooks/Cole: Belmont, CA, 2014; p 131.
(14) - Silberberg, Martin S. Chemistry: The Molecular Nature of Matter and Change, 4th ed.; McGraw-Hill Higher Education: Boston, MA, 2006, p 965.
(15) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; p 14:17.
(16) - Morgan, John W. and Anders, Edward, Proc. Natl. Acad. Sci. USA 77, 6973-6977 (1980)
(17) - Brownlow, Arthur. Geochemistry; Prentice-Hall, Inc.: Englewood Cliffs, NJ, 1979, pp 15-16.