フッ化ストロンチウム 化学特性,用途語,生産方法
外観
白色, 結晶性粉末～粉末
溶解性
水に微溶。アルコールに可溶。塩酸に溶け、水に極めて溶けにくい。
解説
フッ化ストロンチウム,無色の立方晶系結晶．密度4.24 g cm－3．融点1463 ℃，沸点2460 ℃．空気中では1000 ℃ 以下で安定で，それ以上では酸化ストロンチウムになる．水に難溶，塩酸に可溶，フッ化水素酸，エタノール，アセトンに不溶．固体電解質成分，医薬品，光学レンズ，光学薄膜蒸着材，レーザー用単結晶などに用いられる．
森北出版「化学辞典（第2版）
ジンテーゼ
フッ化ストロンチウム,フッ化水素酸に炭酸ストロンチウムを加えると得られる．
化学的特性
Strontium fluoride, also called strontium difluoride and strontium(II) fluoride, is a fluoride of strontium. It is a stable brittle white crystalline solid. It forms face-centered cubic crystals, with structure of calcium fluoride. It is almost insoluble in water. Strontium fluoride is prepared by reaction of strontium chloride with fluorine gas, by action of hydrofluoric acid on strontium carbonate, or by addition of potassium chloride to strontium chloride solution. It irritates eyes and skin, and is harmful when inhaled or ingested.
物理的性質
Strontium fluoride, SrF2, also called "strontium
difluoride" and "strontium (II) fluoride", is a stable, brittle, white crystalline solid with a melting point of 1477°C and a boiling point of 2460°C. Its molecular weight is 125.62 g/mol. Its density is 4.24 g/cm3. Its melting point has also been given as 1463°C and a boiling point of 2489°C. It is virtually insoluble since its solubility in water is 0.00012 g/100 ml of water at 18°C.
SrF2 is almost insoluble in water (its KSP value is
approximately 4.33×10
9 at 25°C. It irritates
eyes and skin, and is harmful when inhaled or
ingested.
使用
Strontium fluoride is transparent to light in the wavelengths from the vacuum UV (150 nm) to the near IR (11 mm). Its optical properties are intermediate to CaF2 and BaF2. Strontium fluoride is used as an optical material for a small range of special applications, for example, as an optical coating on lenses and also as a thermoluminescent dosimeter crystal. Another use is as a carrier of the
90Sr radioisotope in thermoelectric generators. SrF2 is also used as a single crystal for lasers.
製造方法
Strontium fluoride is synthesized by the fluorination of strontium dichloride, or by action of
hydrofluoric acid on strontium carbonate:
SrCl2 (aq)＋ F2 (gas)→SrF2 (solid)＋ Cl2 (gas)
SrCO3＋ 2HF→SrF2＋ CO2＋H2O
Note that the first reaction depends upon the
insolubility of SrF2 in water. Strontium fluoride is
a water-insoluble source for use in oxygen-sensitive applications, such as metal production since it in
nonhygroscopic.
危険性
Toxic material.
安全性プロファイル
Moderately toxic by intravenous route. Mildly toxic by ingestion. When heated to decomposition it emits toxic fumes of F-. See also FLUORIDES and STRONTIUM COMPOUNDS.
参考文献
“Landolt-Börnstein Zahlenwerte und Funktionen aus Naturwissenschaften und Technik, Neue Serie, vol. 7-a”, Springer (1973), p. 13.
フッ化ストロンチウム 上流と下流の製品情報
原材料
準備製品