Magnetic Properties of HCrO2and DCrO2

Magnetic susceptibility measurements and electron paramagnetic resonance measurements have been made on powdered chromous acid (HCr${\mathrm{O}}_2$) and deuterated chromous acid (DCr${\mathrm{O}}_2$). The Curie constants, derived from the susceptibility results, are consistent with three unpaired electrons associated with each chromium ion. In addition, a large Curie-Weiss $\theta$ temperature, indicating a strong exchange interaction, is necessary to account for the results. The most unusual feature of this particular exchange is that it is strongly influenced by deuteration.