ヨウ化カドミウム 化学特性,用途語,生産方法
解説
ヨウ化カドミウム,無色の光沢ある六方晶系結晶．密度5.67 g cm－3．融点385 ℃，沸点713 ℃．水に易溶，エタノール，エーテル，アセトンに可溶．
森北出版「化学辞典（第2版）
応用
ヨウ化カドミウム,カドミウムの電解精練，蛍りん光体，光伝導体，写真，写真製版，防腐剤などに用いられる．
製造
ヨウ化カドミウム,硫酸カドミウムとヨウ化カリウムとの混合水溶液を蒸発乾固し，温無水エタノールで抽出すると得られる．つねに無水物しか得られない.
化学的特性
Pearly white flakes or a crystalline powder
物理的性質
White, hexagonal flakes or crystals; slowly turns yellow upon exposure to air or light; occurs in two allotropic forms, the alpha and beta forms; density 5.67 g/cm
3; melts at 387°C (alpha form) and 404°C (beta form); vaporizes at 742°C; vapor pressures 1 and 5 torr at 416 and 481°C, respectively; soluble in water (86 g/100 mL at 25°C), ethanol, acetone, ether, and ammonia.
使用
Cadmium iodide is used in lithography, photography, electroplating and the manufacturing of phosphors, in engraving process, and was used as an antiseptic and astringent.
製造方法
Cadmium iodide is prepared by the addition of cadmium metal, or its oxide, hydroxide, nitrate or carbonate to hydriodic acid:
CdO + 2HI → CdI
2 + H
2O
Also, the compound can be made by heating cadmium with iodine:
Cd +I
2 → CdI
2
A brownish crystalline β-form of the salt may be obtained by slow crystallization from solutions or fused salt mixtures.
純化方法
Crystallise it from ethanol (2mL/g) by partial evaporation. [Wagenknecht & Juza in Handbook of Preparative Inorganic Chemistry (Ed. Brauer) Academic Press Vol II p 1096 1965.]
ヨウ化カドミウム 上流と下流の製品情報
原材料
準備製品