Influence of Zn/Fe Molar Ratio on Optical and Magnetic Properties of ZnO and ZnFe2O4 Nanocrystal as Calcined Products of Layered Double Hydroxides - Abdullah Ahmed Ali Ahmed; Zainal Abidin Talib; Mohd Zobir Hussein; Moayad Husein Flaifel; Naif Mohammed Al-Hada (Journal of Spectroscopy)