Comments on Paper by A. Manoogian: Interpretation of Ti3+ Electron Spin Resonance Spectra in Alums

Abstract

The argument that Ti3+ ions produce 12 magnetic complexes when substituted for Al3+ in CsAl (SO4)2∙12H2O (Cs alum) is supported neither by experimental evidence nor a realistic physical model. The uniform intensity of the superhyperfine structure in Rb(TiAl) alum disproves the idea that titanium nuclei are involved because the natural abundance of nuclear magnetic isotopes is only 13%. In addition, the magnitudes of the splittings are too small to represent electron–nuclear spin interactions within the Ti3+ ions.