Naphthenates

Lead iron niobate belongs to a large family of complex perovskite type ferroelectric oxides corresponding to the bii ions are randomly distributed in the octahedral positions. At room temperature pfn exhibitsgeneral formula a(bi bii)o3, where BI and ferroelectric and antiferromagnetic properties. The phase transition from rhombohedral (ferroelectric) to cubic (paraelectric) phase takes place at 385k or 388k. According to the transition from antiferromagnetic phase to paramagnetic one takes place at 143k.

Naphthenates are the salts of naphthenic acids, which are an acidic fraction from petroleum processing, and which are composed of a mixture of organic acids, especially cycloalkyl carboxylic acids.