Abstract
Paramagnetic interactions on Manganese ions substituted for Aluminium ions by x-mole fraction ( x=0.01–0.1) for the spinel-type Al-complexes, [AlO 4Al 12(OH) 24(H 2O) 12] 7+, were investigated. The superconducting quantum interference detection (SQUID) measurements showed a small susceptibility of the order of 10 −6 emu/g originated from the Mn ion, and from the saturation value of the DC-magnetization for the 10 mol% Mn concentration, the spin S-value was determined as 2.8 close to its divalent state spin 5/2. The 9 GHz electron paramagnetic resonance (EPR) study revealed that the number of Mn 2+ ions embedded in the axial crystal field had a characteristic maximum at the stoichiometric molar concentration Al/(Al+Al 12) equal to 7.69%, and the Infrared absorption (IR) experimental result verified this evidence. A theoretical approach was made separately for the concentrations below and above 7.69%. The higher-frequency 24 and 97 GHz EPR measurements examined effectively the result of the crystal field analysis in the 9 GHz, except for the small line splittings due to the higher-order Zeeman and hyperfine effects of the S-state ion. The intercalation of Al 1− x Mn x -sulphate ( x=0.07) as a pillaring agent into a clay mineral, montmorillonite, was confirmed from the X-ray diffraction results.
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