The relationship between ionic conductivity and magnetization intensity in ferrites was studied as a function of water uptake. Upon hydration, this ferrite exhibited a decrease in ionic conductivity (from 0.0787 to 0.000713S/m at 548K) and an increase in magnetization. It was almost unchanged upon dehydration. The differing behaviors of magnetization and ionic conductivity in ferrites was attributed to the amount of water uptake, and to a difference in reactivity between Na and K in the crystals.

H.Takamura, T.Kagotani, M.Okada, M.Homma: Materials Transactions, 1993, 34[3], 197-201