Lead(II) iodide

Bleidiiodid

Yellow, odorless solid

Fixed

6.16 g · cm -3

402 ° C

954 ° C

0.756 gl -1 ( 20 ° C)

Risk

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Lead (II ) iodide is a toxic chemical compound consisting of the elements lead, and iodine.

Production and representation

Lead (II) iodide, is a precipitation reaction of lead ( II) nitrate and potassium iodide obtained.

It can thus serve as a test reaction for lead.

Properties

Lead (II ) iodide is a yellowish to orange -colored solid which is sparingly soluble in water, and melts at 402 ° C.

Use

In its crystalline form is used as a detector material for high-energy photons such as X-rays and gamma rays. In the 19th century it has been used by artists as a yellow dye ( Jodgelb ), but was soon replaced by other dyes because of its toxicity and instability to light. Lead (II ) iodide is used for photographic emulsions, with thiols, asbestos-containing brake linings, batteries, with iodine, mercury vapor lamps, thermoelectric materials, and electro- sensitive recording materials as a filter for the infrared astronomy.