Dielectric and magnetic characteristics of Ca(1−x)Mn(x)MoO(4) (0 ≤ x ≤ 0.15) nanomaterials

Scheelite-type Ca(1−x)Mn(x)MoO(4) (x = 0.0, 0.01, 0.05, 0.10 and 0.15) nanomaterials were successfully synthesized via a combustion route. Dielectric studies showed a weak n-type electrical conductivity characteristic for insulators and low relative permittivity (ε(r) < 15) decreasing with increasing Mn(2+) content. CaMoO(4) and Mn(2+)-doped nanomaterials are chemically compatible with Al and Ag electrodes and promising for low-temperature co-fired ceramic applications. Magnetic studies showed, at room-temperature diamagnetism for pure CaMoO(4), the balance between diamagnetism and paramagnetism for Ca(1−x)Mn(x)MoO(4) (x = 0.01) and paramagnetic behaviour when 0.05 ≤ x ≤ 0.15 as well as the short-range antiferromagnetic interactions growing in strength as Mn(2+) content increases. The Landé factor fitting procedure showed a spin-only contribution to the magnetic moment. CaMoO(4) matrix unexpectedly revealed the residual paramagnetism at low temperatures derived probably from the molybdenum ions having unpaired 4d electrons as well as a paramagnetic-diamagnetic transition at 70 K.