ツリウム

69
Tm
該当なし
周期
6
ブロック
f
陽子
電子
中性子
69
69
100
一般特性
原子番号
69
原子量
168.93421
質量数
169
カテゴリ
ランタノイド
銀色
放射性
いいえ
Named after Thule, the earliest name for Scandinavia
結晶構造
六方最密構造
歴史
Thulium was discovered by Swedish chemist Per Teodor Cleve in 1879 by looking for impurities in the oxides of other rare earth elements.

The first researcher to obtain nearly pure thulium was Charles James, a British expatriate working on a large scale at New Hampshire College in Durham.

High-purity thulium oxide was first offered commercially in the late 1950s.
電子殻
2, 8, 18, 31, 8, 2
電子配置
[Xe] 4f13 6s2
Tm
Thulium ore occurs most commonly in China
物理特性
固体
密度
9.321 g/㎝3
融点
1818.15 K | 1545 °C | 2813 °F
沸点
2223.15 K | 1950 °C | 3542 °F
融解熱
16.8 kJ/mol
蒸発熱
250 kJ/mol
熱容量
0.16 J/g·K
地殻中における存在比
0.000045%
宇宙空間における存在比
1×10-8%
Ultrapure
画像の出典: Images-of-elements
Ultrapure crystalline thulium
CAS登録番号
7440-30-4
PubChem CID Number
23961
原子特性
原子半径
176 pm
共有結合半径
190 pm
電気陰性度
1.25 (ポーリングの値)
イオン化エネルギー
6.1843 eV
モル体積
18.1 ㎝3/mol
熱伝導率
0.168 W/㎝·K
酸化数
2, 3
用途
Thulium is used to dope yttrium aluminum garnets used in lasers.

It has also been used in high-temperature superconductors similarly to yttrium.

Thulium has use in ferrites, ceramic magnetic materials that are used in microwave equipment.

Thulium is used in euro banknotes for its blue fluorescence under UV light to defeat counterfeiters.
Thulium is considered to be non-toxic
同位体
安定同位体
169Tm
不安定同位体
145Tm, 146Tm, 147Tm, 148Tm, 149Tm, 150Tm, 151Tm, 152Tm, 153Tm, 154Tm, 155Tm, 156Tm, 157Tm, 158Tm, 159Tm, 160Tm, 161Tm, 162Tm, 163Tm, 164Tm, 165Tm, 166Tm, 167Tm, 168Tm, 170Tm, 171Tm, 172Tm, 173Tm, 174Tm, 175Tm, 176Tm, 177Tm, 178Tm, 179Tm