ホルミウム

導入

原子番号: 67
グループ: なし
原子量: 164.93032
期間: 6
CAS番号: 7440-60-0

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

The spectral absorption bands of holmium were noticed in 1878 by the Swiss chemists Delafontaine and Soret, who announced the existence of an “ElementX”. Cleve, of Sweden, later independently discovered the element while working on erbia earth. The element is named after Cleve’s native city. Pureholmia, the yellow oxide, was prepared by Homberg in 1911. Holmium occurs in gadolinite, monazite, and in other rare-earth minerals. It iscommercially obtained from monazite, occurring in that mineral to the extent of about 0.05%. It has been isolated by the reduction of its anhydrouschloride or fluoride with calcium metal. Pure holmium has a metallic to bright silver luster. It is relatively soft and malleable, and is stable in dry airat room temperature, but rapidly oxidizes in moist air and at elevated temperatures. The metal has unusual magnetic properties. Few uses have yet beenfound for the element. The element, as with other rare earths, seems to have a low acute toxic rating. Natural holmium is not radioactive. Holmiumhas 46 other isotopes known, all of which are radioactive. The price of 99.9% holmium metal is about $15/g. 1

物理的特性

融点:2*  1474 °C = 1747.15 K = 2685.2 °F
沸点:2* 2700 °C = 2973.15 K = 4892 °F
昇華点:2 
三重点:2 
臨界点:2 
密度:3  8.80 g/cm3

* - at 1 atm

電子構成

電子構成:  *[Xe] 6s2 4f11
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 = 0
ms = -½

ボンディング

電気陰性度 (ポーリングスケール):4 1.23
Electropositivity (ポーリングスケール): 2.77

イオン化ポテンシャル   eV 5  kJ/mol  
1 6.0215    581.0
イオン化ポテンシャル   eV 5  kJ/mol  
2 11.8    1138.5
イオン化ポテンシャル   eV 5  kJ/mol  
3 22.84    2203.7
4 42.5    4100.6

熱化学

比熱: 0.165 J/g°C 6 = 27.214 J/mol°C = 0.039 cal/g°C = 6.504 cal/mol°C
熱伝導率: 16.2 (W/m)/K, 27°C 7
融解熱: 12.2 kJ/mol 8 = 74.0 J/g
気化熱: 241 kJ/mol 9 = 1461.2 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 18.0 75.312 0 0
(g) 71.9 300.8296 46.72 195.47648 63.3 264.8472

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
140Ho 139.96854(54)# 6(3) ms 8+# 1,114.83 MeV
141Ho 140.96310(54)# 4.1(3) ms (7/2-) 1,122.90 MeV
142Ho 141.95977(54)# 400(100) ms (6 to 9) 1,140.28 MeV
143Ho 142.95461(43)# 300# ms [>200 ns] 11/2-# 1,148.35 MeV
144Ho 143.95148(32)# 0.7(1) s 1,156.43 MeV
145Ho 144.94720(32)# 2.4(1) s (11/2-) 1,173.81 MeV
146Ho 145.94464(21)# 3.6(3) s (10+) 1,181.88 MeV
147Ho 146.94006(3) 5.8(4) s (11/2-) 1,189.95 MeV
148Ho 147.93772(14) 2.2(11) s (1+) 1,207.34 MeV
149Ho 148.933775(20) 21.1(2) s (11/2-) 1,215.41 MeV
150Ho 149.933496(15) 76.8(18) s 2- 1,223.48 MeV
151Ho 150.931688(13) 35.2(1) s 11/2(-) 1,231.55 MeV
152Ho 151.931714(15) 161.8(3) s 2- 1,239.63 MeV
153Ho 152.930199(6) 2.01(3) min 11/2- 1,247.70 MeV
154Ho 153.930602(9) 11.76(19) min 2- 1,255.77 MeV
155Ho 154.929103(19) 48(1) min 5/2+ 1,273.15 MeV
156Ho 155.92984(5) 56(1) min 4- 1,281.23 MeV
157Ho 156.928256(26) 12.6(2) min 7/2- 1,289.30 MeV
158Ho 157.928941(29) 11.3(4) min 5+ 1,297.37 MeV
159Ho 158.927712(4) 33.05(11) min 7/2- 1,305.44 MeV
160Ho 159.928729(16) 25.6(3) min 5+ 1,313.51 MeV
161Ho 160.927855(3) 2.48(5) h 7/2- 1,321.58 MeV
162Ho 161.929096(4) 15.0(10) min 1+ 1,329.65 MeV
163Ho 162.9287339(27) 4570(25) a 7/2- 1,337.73 MeV
164Ho 163.9302335(30) 29(1) min 1+ 1,336.48 MeV
165Ho 164.9303221(27) STABLE 7/2- 1,344.55 MeV
166Ho 165.9322842(27) 26.83(2) h 0- 1,352.62 MeV
167Ho 166.933133(6) 3.003(18) h 7/2- 1,360.70 MeV
168Ho 167.93552(3) 2.99(7) min 3+ 1,368.77 MeV
169Ho 168.936872(22) 4.72(10) min 7/2- 1,376.84 MeV
170Ho 169.93962(5) 2.76(5) min 6+# 1,384.91 MeV
171Ho 170.94147(64) 53(2) s 7/2-# 1,383.67 MeV
172Ho 171.94482(43)# 25(3) s 1,391.74 MeV
173Ho 172.94729(43)# 10# s 7/2-# 1,399.81 MeV
174Ho 173.95115(54)# 8# s 1,398.56 MeV
175Ho 174.95405(64)# 5# s 7/2-# 1,406.64 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

豊富

地球 - ソース化合物: phosphates 12
地球 - 海水: 0.00000022 mg/L 13
地球 -  地殻:  1.3 mg/kg = 0.00013% 13
地球 -  合計:  80 ppb 14
マーキュリー(惑星) -  合計:  61 ppb 14
金星 -  合計:  84 ppb 14
コンドライト - 合計: 0.076 (relative to 106 atoms of Si) 15

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