Optical and electrical properties of ammonium perchlorate doped with chromate ions

Abstract

The presence of CrO42− ions incorporated substitutionally in single crystals of NH4ClO4 grown from saturated solutions containing 0.1 mol% or 1 mol% CrO42− ion has been demonstrated by measurements of optical absorption, Raman scattering, dielectric loss, and ionic thermoconductivity. The three latter experiments also show the presence of dipoles associated with the CrO42− ions. The dc conductivity of NH4ClO4 crystals is enhanced by doping with CrO42− so that charge transport by defects introduced by the CrO42− ions is inferred. The implications of this finding with respect to mechanisms of charge transport in ammonium perchlorate are discussed.